PHP: ctype_print

Return Values

Returns TRUE if every character in text will actually create output (including blanks). Returns FALSE if text contains control characters or characters that do not have any output or control function at all.

Examples

Example 1. A ctype_print() example

<?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"; } } ?>
The above example will output:
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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ctype_print

pcdinh at gmail dot com
12-Mar-2006 09:43

This function has problems with string quoted with single quotes.

This code proves that 

<?php

$ch = chr(\\\'%0A\\\');
$strings = array(\\\'string1\\\' => \\\'asdf\\\\n\\\\r\\\\t\\\', \\\'string2\\\' => $ch);
foreach ($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\\\";
   }
}
?> 

returns

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

So always quote your strings with double quotes.

flatline at greyhat dot nl
04-Mar-2004 09:58


It seems that this function does not recognize characters such as '�', '�', '�', '�' as printable.





Depends on your locale settings, in the default "C" locale they are


indeed not printable as it is 7bit ASCII based. (hartmut)

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ctype_print

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