ctype_cntrl

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

ctype_cntrl — Check for control character(s)

Description

ctype_cntrl(mixed $text): bool

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.

Note:

If an int 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.

Warning

As of PHP 8.1.0, passing a non-string argument is deprecated. In the future, the argument will be interpreted as a string instead of an ASCII codepoint. Depending on the intended behavior, the argument should either be cast to string or an explicit call to chr() should be made.

Return Values

Returns true if every character in text is a control character from the current locale, false otherwise. When called with an empty string the result will always be false.

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.

See Also