ctype_print

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

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ctype_print ( string $text ) : bool

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text

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Example #1 Ò»¸ö ctype_print() Àý×Ó

<?php
$strings 
= array('string1' => "asdf\n\r\t"'string2' => 'arf12''string3' => 'LKA#@%.54');
foreach (
$strings as $name => $testcase) {
    if (
ctype_print($testcase)) {
        echo 
"The string '$name' consists of all printable characters.\n";
    } else {
        echo 
"The string '$name' does not consist of all printable characters.\n";
    }
}
?>

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The string 'string1' does not consist of all printable characters.
The string 'string2' consists of all printable characters.
The string 'string3' consists of all printable characters.

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Note:

Èç¹û¸ø³öÒ»¸ö -128 µ½ 255 Ö®¼ä(º¬)µÄint, ½«»á±»½âÊÍΪ¸ÃÖµ¶ÔÓ¦µÄASCII×Ö·û (¸ºÖµ½«¼ÓÉÏ 256 ÒÔÖ§³ÖÀ©Õ¹ASCII×Ö·û). ÆäËüÕûÊý½«»á±»½âÊÍΪ¸ÃÖµ¶ÔÓ¦µÄÊ®½øÖÆ×Ö·û´®.

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  • ctype_cntrl() - ×ö¿ØÖÆ×Ö·û¼ì²â
  • ctype_graph() - ×ö¿É´òÓ¡×Ö·û´®¼ì²â£¬¿Õ¸ñ³ýÍâ
  • ctype_punct() - ¼ì²â¿É´òÓ¡µÄ×Ö·ûÊDz»ÊDz»°üº¬¿Õ°×¡¢Êý×ÖºÍ×Öĸ

User Contributed Notes

ClayDragon 02-Sep-2018 09:20
As mentioned above, only ASCII characters from 32 to 126 are considered printable, all others, including UTF-8 encoded characters are always considered unprintable, no matter what your locale settings are. Therefore, e.g. German "?", the Euro sign "€" or the British pound symbol "¡ê" will never be printable. If you need to check any characters for "printability" beyond the standard ASCII range, use a regular expression or write a specific function yourself.

See also this discussion: https://grokbase.com/t/php/php-i18n/102tkqe6rk/ctype-print-returns-false-for-british-pound-symbol-and-non-ascii-symbols
Anonymous 12-Jun-2012 05:59
Only ascii 32 thru 126 (inclusive) are considered printable. Tab (ascii 7), carriage return (ascii 13), linefeed (ascii 10) etc may produce output but are not considered printable.