ctype_cntrl
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
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.
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.
See Also
- ctype_print() - Check for printable character(s)
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.ctype-cntrl.php