ctype_cntrl
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
- ctype_print() - Check for printable character(s)
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.ctype-cntrl.php