ctype_cntrl
(PHP 4 >= 4.0.4, PHP 5)
ctype_cntrl — Check for control character(s)
Description
bool ctype_cntrl
( string $text
)
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.
ctype_alpha
