PHP Manual: ctype_cntrl

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ctype_cntrl

(PHP 4 >= 4.0.4, PHP 5)

ctype_cntrl -- Check for control character(s)

Description

bool ctype_cntrl ( string text )

Checks if all of the characters in the provided string, text, are control characters. Control characters are e.g. line feed, tab, escape.

Parameters

text: The tested string.

Return Values

Returns TRUE if every character in text is a control character from the current locale, FALSE otherwise.

Examples

Example 1. A ctype_cntrl() example


<?php
$strings = array('string1' => "\n\r\t", 'string2' => 'arf12');
foreach ($strings as $name => $testcase) {
    if (ctype_cntrl($testcase)) {
        echo "The string '$name' consists of all control characters.\n";
    } else {
        echo "The string '$name' does not consist of all control characters.\n";
    }
}
?>

The above example will output:

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