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PHP ctype_cntrl

PHP original manual for ctype_cntrl [ show | php.net ]

ctype_cntrl

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

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.

Notes

Note:

If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.

See Also