ctype_cntrl
PHP function
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(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
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
textThe tested string. Integer Non-string
Return Values
Returns true if every character in text is a control character from the current locale, false otherwise. Empty-string
Examples
A ctype_cntrl() example
php
<?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:
output
The string 'string1' consists of all control characters.
The string 'string2' does not consist of all control characters.