Php/docs/function.ctype-cntrl
ctype_cntrl
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ctype_cntrl — Check for control character(s)
Description
ctype_cntrl
( mixed $text
) : bool
Checks if all of the characters in the provided string,
text, are control characters.
Control characters are e.g. line feed, tab, escape.
Parameters
textThe tested string.
Note:
If an int between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.
Return Values
Returns TRUE if every character in text is
a control character from the current locale, FALSE otherwise.
Examples
Example #1 A ctype_cntrl() example
<?php$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.
