ucwords

(PHP 4, PHP 5, PHP 7, PHP 8)

ucwords — 将字符串中每个单词的首字母转换为大写

说明

ucwords ( string $str , string $delimiters = " \t\r\n\f\v" ) : string

将 str 中每个单词的首字符（如果首字符是字母）转换为大写字母，并返回这个字符串。

这里单词的定义是紧跟在 delimiters 参数（默认：空格符、制表符、换行符、回车符、水平线以及竖线）之后的子字符串。

参数

str

输入字符串。

delimiters

可选的 delimiters，包含了单词分割字符。

返回值

返回转换后的字符串。

更新日志

版本 说明
5.4.32, 5.5.16 增加了 delimiters 参数。

范例

Example #1 ucwords() 范例

<?php
$foo = 'hello world!';
$foo = ucwords($foo);             // Hello World!

$bar = 'HELLO WORLD!';
$bar = ucwords($bar);             // HELLO WORLD!
$bar = ucwords(strtolower($bar)); // Hello World!
?>

Example #2 ucwords() 自定义 delimiters 的例子

<?php
$foo = 'hello|world!';
$bar = ucwords($foo);             // Hello|world!

$baz = ucwords($foo, "|");        // Hello|World!
?>

注释

Note: 此函数可安全用于二进制对象。

参见

User Contributed Notes

NOSPAM dot php at my dot jrklein dot com 25-Jul-2020 05:08
Based on code sample originally posted by "Anonymous" on 2005-12-14. The /e modifier is no longer supported by preg_replace(). Rewritten to use preg_replace_callback() instead. Tested with PHP 7.3.

The function below will standardize the capitalization on people's names, addresses, and the titles of reports and essays . Adapt the lists in "$all_uppercase" and "$all_lowercase" to suit the data that you are working with.

function ucwords_title($string, $is_name = false) {
    // Exceptions to standard case conversion
    if ($is_name) {
        $all_uppercase = '';
        $all_lowercase = 'De La|De Las|Der|Van De|Van Der|Vit De|Von|Or|And';
    } else {
        // Addresses, essay titles ... and anything else
        $all_uppercase = 'Us|Ca|Mx|Po|Rr|Se|Sw|Ne|Nw';
        $all_lowercase = 'A|And|As|By|In|Of|Or|To';
    }
    $prefixes = 'Mac|Mc';
    $suffixes = "'S";

    // Trim whitespace and convert to lowercase
    $str = strtolower(trim($string));

    // Capitalize all first letters
    $str = preg_replace_callback('/\\b(\\w)/', function ($m) {
        return strtoupper($m[1]);
    }, $str);

    if ($all_uppercase) {
        // Capitalize acronyms and initialisms (e.g. PHP)
        $str = preg_replace_callback('/\\b(' . $all_uppercase . ')\\b/', function ($m) {
            return strtoupper($m[1]);
        }, $str);
    }
    if ($all_lowercase) {
        // Decapitalize short words (e.g. and)
        if ($is_name) {
            // All occurrences will be changed to lowercase
            $str = preg_replace_callback('/\\b(' . $all_lowercase . ')\\b/', function ($m) {
                return strtolower($m[1]);
            }, $str);
        } else {
            // First and last word will not be changed to lower case (i.e. titles)
            $str = preg_replace_callback('/(?<=\\W)(' . $all_lowercase . ')(?=\\W)/', function ($m) {
                return strtolower($m[1]);
            }, $str);
        }
    }
    if ($prefixes) {
        // Capitalize letter after certain name prefixes (e.g 'Mc')
        $str = preg_replace_callback('/\\b(' . $prefixes . ')(\\w)/', function ($m) {
            return $m[1] . strtoupper($m[2]);
        }, $str);
    }
    if ($suffixes) {
        // Decapitalize certain word suffixes (e.g. 's)
        $str = preg_replace_callback('/(\\w)(' . $suffixes . ')\\b/', function ($m) {
            return $m[1] . strtolower($m[2]);
        }, $str);
    }

    return $str;
}

// A name example
print ucwords_title("MARIE-LOU VAN DER PLANCK-ST.JOHN", true);
// Output: Marie-Lou van der Planc-St.John

// A title example
print ucwords_title("to be or not to be");
// Output: "To Be or Not to Be"
ganzales at inbox dot ru 26-May-2020 01:03
<?php
function mb_ucwords($string, $delimiter = ' (-"[') {
    $result = $upper = '';
    for ($i = 0; $i < mb_strlen($string); $i++) {
        $letter = mb_substr($string, $i, 1);
        $result .= $upper || $i == 0 ? mb_convert_case($letter, MB_CASE_TITLE) : $letter;
        $upper = ($i + 1) < mb_strlen($string) && mb_strpos($delimiter, $letter) !== false ? 1 : 0;
    }
    return $result;
}
?>
@manzoorwanijk 04-Sep-2018 09:39
for PHP < 5.4.32 with $delimiters

function _ucwords( $str, $delimiters = " \t\r\n\f\v" ) {

    $delims = preg_split( '//u', $delimiters, -1, PREG_SPLIT_NO_EMPTY );

    foreach ( $delims as $delim ) {
       
        if ( false !== strpos( $str, $delim ) ) {

            $str = implode( $delim, array_map( 'ucfirst', explode( $delim, $str ) ) );
        }
    }

    return $str;
}
almino dot melo at gmail dot com 29-Feb-2016 08:36
ucwords for human names in Brazil.
ucwords personalizada para nomes próprios brasileiros.

<?php
    /**
     * ucwords for human names in Brazil
     * Edit from http://php.net/manual/pt_BR/function.ucwords.php#112795
     * @param string $str
     * @param array $delimiters
     * @param array $exceptions Exceptions are words you don't want converted
     * @return string
     */
    function name($str, $delimiters = array(
        " ",
        "-",
        ".",
        "'",
        "O'",
        "Mc",
    ), $exceptions = array(
        "de",
        "do",
        "da",
        "dos",
        "das",
    )) {
        $result = '';

        foreach ($delimiters as $delimiter) {
            # If string has a delimiter
            if (strstr($str, $delimiter)) {

                $ucfirst = array();
                # Apply ucfirst to every word
                foreach (explode($delimiter, mb_strtolower($str)) as $word) {
                    $word = mb_convert_case($word, MB_CASE_TITLE);

                    # Working with exceptions
                    if (in_array(mb_strtoupper($word), $exceptions)) {
                        $word = mb_strtoupper($word);
                    } elseif (in_array(mb_strtolower($word), $exceptions)) {
                        $word = mb_strtolower($word);
                    } elseif (preg_match('/^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$/', mb_strtoupper($word))) {
                        # Is roman numerals? # http://stackoverflow.com/a/267405/437459
                        $word = mb_strtoupper($word);
                    }

                    $ucfirst[] = $word;
                }

                # string's first character uppercased
                $result = implode($delimiter, $ucfirst);
            }
        }

        return $result;
    }
?>
Lech 01-Sep-2015 02:36
This will correct capitalisation in names taking note of special capitalisation for Mc..., Mac..., and O'... Other special cases, of which I am not aware, can be added easily.

This is just a slight improvement on "deepdene at email dot com"'s name_case function... Thank you for original function.

<?php

function name_case($name) {
    if( !$name ) return $name;
    $newname = strtoupper($name[0]);
    $break = false;
    for( $i=1; $i<strlen($name); ++$i ) {
      $subed = substr($name, $i, 1);
      if( ord($subed) > 64 && ord($subed) < 123 || ord($subed) > 48 && ord($subed) < 58 ) {
        if( $break ) {
          $newname .= strtoupper($subed);
        }
        elseif( $i > 1 && in_array(substr($newname, $i-2, 2), array('Mc', 'O\'')) || $i > 2 && in_array(substr($newname, $i-3, 3), array('Mac')) ) {
          $newname .= strtoupper($subed);
        }
        else {
          $newname .= strtolower($subed);
        }
        $break = false;
      }
      else {
        // not a letter - a boundary
        $newname .= $subed;
        $break = true;
      }
    }  
    return $newname;

?>
Alex Milkovskyi 13-May-2015 09:22
Convert string to in camel-case, useful for class name patterns:
<?php
/**
   * Convert string to in camel-case, useful for class name patterns.
   *
   * @param $string
   *   Target string.
   *
   * @return string
   *   Camel-case string.
   */
function toCamelCase($string){
    $string = str_replace('-', ' ', $string);
    $string = str_replace('_', ' ', $string);
    $string = ucwords(strtolower($string));
    $string = str_replace(' ', '', $string);
    return $string;
}
?>

Example:
toCamelCase(make_mE camel-case pLEase) will return:
MakeMeCamelCasePlease
Florian 20-Feb-2015 08:03
to convert first letters in a firstname like: "jean-pierre" to "Jean-Pierre":

I simply replace the '-' with a vertical tabulation, because the ucwords() function replace the letter just after it.

so, I use the sentence:
$result=str_replace(chr(11),'-',ucwords(strtolower(str_replace('-',chr(11),$firstname))));
antoniomax at antoniomax dot com 23-Jul-2013 06:04
Para formatar nomes em pt-br:

<?php

    function titleCase($string, $delimiters = array(" ", "-", ".", "'", "O'", "Mc"), $exceptions = array("de", "da", "dos", "das", "do", "I", "II", "III", "IV", "V", "VI"))
    {
        /*
         * Exceptions in lower case are words you don't want converted
         * Exceptions all in upper case are any words you don't want converted to title case
         *   but should be converted to upper case, e.g.:
         *   king henry viii or king henry Viii should be King Henry VIII
         */
        $string = mb_convert_case($string, MB_CASE_TITLE, "UTF-8");
        foreach ($delimiters as $dlnr => $delimiter) {
            $words = explode($delimiter, $string);
            $newwords = array();
            foreach ($words as $wordnr => $word) {
                if (in_array(mb_strtoupper($word, "UTF-8"), $exceptions)) {
                    // check exceptions list for any words that should be in upper case
                    $word = mb_strtoupper($word, "UTF-8");
                } elseif (in_array(mb_strtolower($word, "UTF-8"), $exceptions)) {
                    // check exceptions list for any words that should be in upper case
                    $word = mb_strtolower($word, "UTF-8");
                } elseif (!in_array($word, $exceptions)) {
                    // convert to uppercase (non-utf8 only)
                    $word = ucfirst($word);
                }
                array_push($newwords, $word);
            }
            $string = join($delimiter, $newwords);
       }//foreach
       return $string;
    }

?>

Usage:

<?php
    $s = 'S?O JO?O DOS SANTOS';
    $v = titleCase($s); // 'S?o Jo?o dos Santos'
?>
hrvoj3e at gmail dot com 30-Apr-2013 02:44
UTF-8 Title Case that works for me even with hyphens involved!

$str = '?aa?aa-AAAaaa, BBbb';

$str = mb_convert_case($str, MB_CASE_TITLE, "UTF-8");

echo($str): '?aa?aa-Aaaaaa, Bbbb'
Luca Borrione luca -a email -d c_o_m 10-Sep-2012 03:41
Features:
- multi byte compatible
- handles multiple delimiters

<?php
function ucwords_specific ($string, $delimiters = '', $encoding = NULL)
{
    if ($encoding === NULL) { $encoding = mb_internal_encoding();}

    if (is_string($delimiters))
    {
        $delimiters =  str_split( str_replace(' ', '', $delimiters));
    }

    $delimiters_pattern1 = array();
    $delimiters_replace1 = array();
    $delimiters_pattern2 = array();
    $delimiters_replace2 = array();
    foreach ($delimiters as $delimiter)
    {
        $uniqid = uniqid();
        $delimiters_pattern1[]   = '/'. preg_quote($delimiter) .'/';
        $delimiters_replace1[]   = $delimiter.$uniqid.' ';
        $delimiters_pattern2[]   = '/'. preg_quote($delimiter.$uniqid.' ') .'/';
        $delimiters_replace2[]   = $delimiter;
    }

    // $return_string = mb_strtolower($string, $encoding);
    $return_string = $string;
    $return_string = preg_replace($delimiters_pattern1, $delimiters_replace1, $return_string);

    $words = explode(' ', $return_string);

    foreach ($words as $index => $word)
    {
        $words[$index] = mb_strtoupper(mb_substr($word, 0, 1, $encoding), $encoding).mb_substr($word, 1, mb_strlen($word, $encoding), $encoding);
    }

    $return_string = implode(' ', $words);

    $return_string = preg_replace($delimiters_pattern2, $delimiters_replace2, $return_string);

    return $return_string;
}
?>

Params:
1. string: The string being converted
2. delimiters: a string with all wanted delimiters written one after the other e.g. "-'"
3. encoding: Is the character encoding. If it is omitted, the internal character encoding value will be used.

Example Usage:
<?php
mb_internal_encoding('UTF-8');
$string = "JEAN-PAUL d'artagnan ??-òà-éì hello - world";
echo ucwords_specific( mb_strtolower($string, 'UTF-8'), "-'");
?>

Output:
Jean-Paul D'Artagnan ??-òà-éì Hello - World
qeremy [atta] gmail [dotta] com 27-Feb-2012 05:09
A proper Turkish solution;

<?php
function ucfirst_turkish($str) {
    $tmp = preg_split("//u", $str, 2, PREG_SPLIT_NO_EMPTY);
    return mb_convert_case(
        str_replace("i", "?", $tmp[0]), MB_CASE_TITLE, "UTF-8").
        $tmp[1];
}

function ucwords_turkish($str) {
    return preg_replace("/(\\w+)/ue", "ucfirst_turkish('\\\\1').'$2'", $str);
}

$str = "iyilik güzelL?K ?eker ";
echo ucwords($str) ."\\n";   // Iyilik GüzelL?K ?eker
echo ucwords_turkish($str); // ?yilik GüzelL?K ?eker
?>
haijerome at gmail dot com 21-Nov-2011 09:14
Thanks a lot brother.

I tested it with a few variations. It works perfectly. Its really great and simple usage of the existing functions. It would be glad to all PHP folks and good to PHP if these kind of functions will be in PHP library on upcoming releases.

<?php

$name1 = "mark-yves robert";
$name2 = "mark-yves robert-bryan";

echo '<br/>Name 1 (mark-yves robert) =>'.
ucwordspecific($name1,'-'); //returns Mark-Yves Robert

echo '<br/>Name 2 (mark-yves robert-bryan)

=>'.ucwordspecific($name2,'-');
//returns Mark-Yves Robert-Bryan

function ucwordspecific($str,$delimiter){
$delimiter_space = '- ';
return str_replace($delimiter_space,$delimiter,ucwords

(str_replace($delimiter,$delimiter_space,$str)));
}

?>

Proud to be a PHP enthusiast always :-)
ahmet363 at gmail dot com 16-Oct-2011 11:14
Turkish character with the ucwords function...

<?php
function ucwords_tr($gelen){

  $sonuc='';

  $kelimeler=explode(" ", $gelen);

  foreach ($kelimeler as $kelime_duz){

    $kelime_uzunluk=strlen($kelime_duz);
    $ilk_karakter=mb_substr($kelime_duz,0,1,'UTF-8');

    if($ilk_karakter=='?' or $ilk_karakter=='?'){

      $ilk_karakter='?';

    }elseif ($ilk_karakter=='?' or $ilk_karakter=='?') {

      $ilk_karakter='?';

    }elseif($ilk_karakter=='I' or $ilk_karakter=='?'){

      $ilk_karakter='I';

    }elseif ($ilk_karakter=='?' or $ilk_karakter=='i'){

      $ilk_karakter='?';

    }elseif ($ilk_karakter=='?' or $ilk_karakter=='?'){

      $ilk_karakter='?';

    }elseif ($ilk_karakter=='?' or $ilk_karakter=='?'){

      $ilk_karakter='?';

    }elseif ($ilk_karakter=='ü' or $ilk_karakter=='ü'){

      $ilk_karakter='ü';

    }else{

      $ilk_karakter=strtoupper($ilk_karakter);

    }

    $digerleri=mb_substr($kelime_duz,1,$kelime_uzunluk,'UTF-8');
    $sonuc.=$ilk_karakter.kucuk_yap($digerleri).' ';

  }

  $son=trim(str_replace('  ', ' ', $sonuc));
  return $son;

}

function kucuk_yap($gelen){

  $gelen=str_replace('?', '?', $gelen);
  $gelen=str_replace('?', '?', $gelen);
  $gelen=str_replace('I', '?', $gelen);
  $gelen=str_replace('?', 'i', $gelen);
  $gelen=str_replace('?', '?', $gelen);
  $gelen=str_replace('?', '?', $gelen);
  $gelen=str_replace('ü', 'ü', $gelen);
  $gelen=strtolower($gelen);

  return $gelen;
}

echo ucwords_tr('?EKardi ?EM??YE ?ELEN? ?MER'); // ?ekardi ?em?iye ?elen? ?mer
echo ucwords_tr('?EKER iMSAK ??LEN'); // ?eker ?msak ??len
jmarois at ca dot ibm dot com 12-Feb-2010 08:51
My quick and dirty ucname (Upper Case Name) function.

<?php
//FUNCTION

function ucname($string) {
    $string =ucwords(strtolower($string));

    foreach (array('-', '\'') as $delimiter) {
      if (strpos($string, $delimiter)!==false) {
        $string =implode($delimiter, array_map('ucfirst', explode($delimiter, $string)));
      }
    }
    return $string;
}
?>
<?php
//TEST

$names =array(
  'JEAN-LUC PICARD',
  'MILES O\'BRIEN',
  'WILLIAM RIKER',
  'geordi la forge',
  'bEvErly CRuSHeR'
);
foreach ($names as $name) { print ucname("{$name}\n"); }

//PRINTS:
/*
Jean-Luc Picard
Miles O'Brien
William Riker
Geordi La Forge
Beverly Crusher
*/
?>

You can add more delimiters in the for-each loop array if you want to handle more characters.
robert at broofa dot com 08-Jul-2009 06:42
Some recipes for switching between underscore and camelcase naming:

<?php
// underscored to upper-camelcase
// e.g. "this_method_name" -> "ThisMethodName"
preg_replace('/(?:^|_)(.?)/e',"strtoupper('$1')",$string);

// underscored to lower-camelcase
// e.g. "this_method_name" -> "thisMethodName"
preg_replace('/_(.?)/e',"strtoupper('$1')",$string);

// camelcase (lower or upper) to underscored
// e.g. "thisMethodName" -> "this_method_name"
// e.g. "ThisMethodName" -> "this_method_name"
strtolower(preg_replace('/([^A-Z])([A-Z])/', "$1_$2", $string));
?>

Of course these aren't 100% symmetric.  For example...
  * this_is_a_string -> ThisIsAString -> this_is_astring
  * GetURLForString -> get_urlfor_string -> GetUrlforString
Greg S 26-Apr-2009 09:16
I did the same thing as Catalin, but for French names.

Here's what I'm doing :

For each word (not considering the single-quote as a word boundary character) :
- Put the word in lower case
- If the word is "de", return, else, put the first letter in upper-case
- See if the second character of the word is a single-quote
- Yes ? Put the next char in upper case
- And if the char before the single quote is D, put it back to lower case (-> d)

This complies with the French rules for capitalization in names.

Sample results :
-d'Afoo Bar
-de Foo Bar
-O'Foo Bar
-Foo'bar

<?php
function my_ucwords($s) {
        $s = preg_replace_callback("/(\b[\w|']+\b)/s", fixcase_callback, $s);
       
        return $s;        
       
    }
   
    function fixcase_callback($word) {

        $word = $word[1];
       
        $word = strtolower($word);
       
        if($word == "de")
            return $word;
       
        $word = ucfirst($word);
       
        if(substr($word,1,1) == "'") {
            if(substr($word,0,1) == "D") {
                $word = strtolower($word);
            }
            $next = substr($word,2,1);
            $next = strtoupper($next);
            $word = substr_replace($word, $next, 2, 1);
        }
       
        return $word;
    }
?>
strazds at gmail dot com 01-Nov-2008 02:45
ucwords for UTF-8 strings:

<?php
function mb_ucwords($str) {
    $str = mb_convert_case($str, MB_CASE_TITLE, "UTF-8");
    return ($str);
}
?>
Alex 27-Aug-2008 09:43
A modified sentenceNormalizer by gregomm
 
Features:
1- Removes duplicated question marks, exclamations and periods
2- Capitalize first letter of a sentence.
3- Split sentences not only with "." but also with "?" and "!"
4- Puts a white space at the end of each sentence
5- Retains newlines

--removed from orginal function--
undestand the meaning of "?" and "?" in languages like spanish.
undestand the htmlentitity version of this simbols.
--removed from orginal function--

<?php
function sentenceNormalizer($sentence_split) {
    $sentence_split = preg_replace(array('/[!]+/','/[?]+/','/[.]+/'),
                                   array('!','?','.'),$sentence_split);       
   
    $textbad = preg_split("/(\!|\.|\?|\n)/", $sentence_split,-1,PREG_SPLIT_DELIM_CAPTURE);
    $newtext = array();
    $count = sizeof($textbad);
   
    foreach($textbad as $key => $string) {
        if (!empty($string)) {
            $text = trim($string, ' ');
            $size = strlen($text);
           
            if ($size > 1){    
                $newtext[] = ucfirst(strtolower($text));
            }
                elseif ($size == 1) {
                    $newtext[] = ($text == "\n") ? $text : $text . ' ';
                }     
        }
    }
   
    return implode($newtext);
}
?>
blake at goinoutwest dot com 29-Jan-2008 05:14
Relating to the mb_ucwords() function posted by Anonymous.  In order for this to actually be multi-byte compliant, you would also need to use mb_substr() and mb_strlen() instead of substr and strlen respectively.

Here it is corrected and extended even further to allow multiple word separators and a list of exceptions to correct after title casing. It's a bit tedious and inelegant, but things frequently are when dealing with human languages.

function mb_ucwords($str) {
    $exceptions = array();
    $exceptions['Hp'] = 'HP';
    $exceptions['Ibm'] = 'IBM';
    $exceptions['Gb'] = 'GB';
    $exceptions['Mb'] = 'MB';
    $exceptions['Cd'] = 'CD';
    $exceptions['Dvd'] = 'DVD';
    $exceptions['Usb'] = 'USB';
    $exceptions['Mm'] = 'mm';
    $exceptions['Cm'] = 'cm';
    //    etc.
   
    $separator = array(" ","-","+");
   
    $str = mb_strtolower(trim($str));
    foreach($separator as $s){
        $word = explode($s, $str);

        $return = "";
        foreach ($word as $val){
            $return .= $s . mb_strtoupper($val{0}) . mb_substr($val,1,mb_strlen($val)-1);
        }
        $str = mb_substr($return, 1);
    }

    foreach($exceptions as $find=>$replace){
        if (mb_strpos($return, $find) !== false){
            $return = str_replace($find, $replace, $return);
        }
    }
    return mb_substr($return, 1);
}
kendsnyder at gmail dot com 30-Jul-2007 01:02
Here is a function to capitalize a last name, accounting for hyphens, apostrophes, "Mc" and "Mac":

<?php
function CapitalizeLastName($name) {
    $name = strtolower($name);
    $name = join("'", array_map('ucwords', explode("'", $name)));
    $name = join("-", array_map('ucwords', explode("-", $name)));
    $name = join("Mac", array_map('ucwords', explode("Mac", $name)));
    $name = join("Mc", array_map('ucwords', explode("Mc", $name)));
    return $name;
}
?>

I speed tested it against functions that used preg_replace() with an "e" modifier, preg_replace_callback(), and a character-by-character parsing.  Unexpectedly, this function using join(), array_map() and explode() was fastest.
Q1712 at online dot ms 05-May-2007 12:49
ucwords() only excepts whitespace in front of a word, although some chars like '"' or '(' normally have no space between them and the following word:
<?php
$title = 'ELVIS "THE KING" PRESLEY - (LET ME BE YOUR) TEDDY BEAR';
echo ucwords(strtolower($title));
?>
prints: Elvis "the King" Presley - (let Me Be Your) Teddy Bear

To avoid this i use a small function adding and deleting blanks behind these chars, and using ucwords() in between:

<?php
function my_ucwords($string)
  {
    $noletters='"([/'; //add more if u need to
    for($i=0; $i<strlen($noletters); $i++)
      $string = str_replace($noletters[$i], $noletters[$i].' ', $string);
    $string=ucwords($string);
    for($i=0; $i<strlen($noletters); $i++)
      $string = str_replace($noletters[$i].' ', $noletters[$i], $string);
    return $string;
  }

$title = 'ELVIS "THE KING" PRESLEY - (LET ME BE YOUR) TEDDY BEAR';
echo my_ucwords(strtolower($title));
?>

prints: Elvis "The King" Presley - (Let Me Be Your) Teddy Bear
barnaby ritchley at exeye dot co dot uk 03-Jan-2007 08:53
A very easy way to convert to title case:

function titleCase($string)
     {
     return ucwords(strtolower($string));
     }

$myString = "SOME TEXT";

echo titleCase($myString);

//will print, "My Text"
Ismet Togay 30-May-2006 05:07
Response to arif:

We do not need that long functions. In order to make ucwords() worked properly in Turkish words that contain speacial characters, we can use the following command in our php codes:

setlocale(LC_ALL, 'tr_TR');

This will set locale to Turkish.
lev at phpfox dot com 06-May-2006 01:44
In the function ucsmart() posted by ieure at php dot net on 04-Dec-2005 11:57, I found a similar problem in this function to what he found in igua's.

<?php
function ucsmart($text)
{
   return preg_replace('/([^a-z]|^)([a-z])/e', '"$1".strtoupper("$2")',
                       strtolower($text));
}
?>

"igua's code adds a backslash in front of the first single quote for me. This doesn't alter the content in any way other than changing case."

Actually, it did end up changing the content for me (php 5.0.4) in the way that this function escapes a single quotation (apostrophe) in the MIDDLE of a word.

For example:

who's online?

Became:

Who\'s Online?

The fix is simple however, and merely requires fine-tuning the regular expression:

<?php
function ucsmart($text)
{
   return preg_replace('/([^a-z\']|^)([a-z])/e', '"$1".strtoupper("$2")',
                       strtolower($text));
}
?>

(note: while previewing this note before adding it, I am noticing php's website is not correctly displaying the change I made as I wrote it. After the first a-z in the expression, the single quotation should be escaped... If it isn't you will get a parse error! And apoligies if my text here is colored as php code; not my fault!)

This will not escape a single quotation mark which occurs in the middle of a word... Though, you may find that might need to add other characters inside the regular expression if you use other special characters inside your words and if you get funky output.

It's a great expression though! Simple, yet very powerful. Kudos!
24-Dec-2005 07:34
"ieure at php dot net", your idea is pure poetry!

The function below will standardize the capitalization on people's names and the titles of reports and essays . You may need to adapt the lists in "$all_uppercase" and "$all_lowercase" to suit the data that you are working with.

function my_ucwords($str, $is_name=false) {
   // exceptions to standard case conversion
   if ($is_name) {
       $all_uppercase = '';
       $all_lowercase = 'De La|De Las|Der|Van De|Van Der|Vit De|Von|Or|And';
   } else {
       // addresses, essay titles ... and anything else
       $all_uppercase = 'Po|Rr|Se|Sw|Ne|Nw';
       $all_lowercase = 'A|And|As|By|In|Of|Or|To';
   }
   $prefixes = 'Mc';
   $suffixes = "'S";

   // captialize all first letters
   $str = preg_replace('/\\b(\\w)/e', 'strtoupper("$1")', strtolower(trim($str)));

   if ($all_uppercase) {
       // capitalize acronymns and initialisms e.g. PHP
       $str = preg_replace("/\\b($all_uppercase)\\b/e", 'strtoupper("$1")', $str);
   }
   if ($all_lowercase) {
       // decapitalize short words e.g. and
       if ($is_name) {
           // all occurences will be changed to lowercase
           $str = preg_replace("/\\b($all_lowercase)\\b/e", 'strtolower("$1")', $str);
       } else {
           // first and last word will not be changed to lower case (i.e. titles)
           $str = preg_replace("/(?<=\\W)($all_lowercase)(?=\\W)/e", 'strtolower("$1")', $str);
       }
   }
   if ($prefixes) {
       // capitalize letter after certain name prefixes e.g 'Mc'
       $str = preg_replace("/\\b($prefixes)(\\w)/e", '"$1".strtoupper("$2")', $str);
   }
   if ($suffixes) {
       // decapitalize certain word suffixes e.g. 's
       $str = preg_replace("/(\\w)($suffixes)\\b/e", '"$1".strtolower("$2")', $str);
   }
   return $str;
}

// A name example
print my_ucwords("MARIE-LOU VAN DER PLANCK-ST.JOHN", true);
// Output: Marie-Lou van der Planc-St.John

// A title example
print my_ucwords("to be or not to be");
// Output: "To Be or Not to Be"
deepdene at email dot com 09-Dec-2002 11:20
A function knowing about name case (i.e. caps on McDonald etc)

function name_case($name)
{
    $newname = strtoupper($name[0]);   
    for ($i=1; $i < strlen($name); $i++)
    {
        $subed = substr($name, $i, 1);    
        if (((ord($subed) > 64) && (ord($subed) < 123)) ||
            ((ord($subed) > 48) && (ord($subed) < 58)))
        {
            $word_check = substr($name, $i - 2, 2);
            if (!strcasecmp($word_check, 'Mc') || !strcasecmp($word_check, "O'"))
            {
                $newname .= strtoupper($subed); 
            }
            else if ($break)
            {
               
                $newname .= strtoupper($subed);
            }
            else      
            {
                $newname .= strtolower($subed);
            }
             $break=0;
        }
        else
        {
            // not a letter - a boundary
             $newname .= $subed;
            $break=1;
        }
    }   
    return $newname;
}
18-Jan-2002 06:14
This seems to be what people want:

function uc_all($string) {
    $temp = preg_split('/(\W)/', $string, -1, PREG_SPLIT_DELIM_CAPTURE );
    foreach ($temp as $key=>$word) {
        $temp[$key] = ucfirst(strtolower($word));
    }
    return join ('', $temp);
}

[ed note: fixed the code to be correct]
neil at no-spam-ents24 dot com 21-Mar-2001 05:10
The code posted above by Joerg Krause only works for a string which ends with one of the delimiters. A possible fix is:

<?php
$text = "What?No delimiters,shit happens here.this solves all problems.";
preg_match_all("/(\w+[,. ?])+/U", $text, $words);
preg_match("/(\w+)$/", $text, $lastword);
$words[0][] = $lastword;
foreach($words[0] as $part) $uwords[] = ucfirst($part);
$text = implode("", $uwords);
echo $text;
?>