Returns TRUE if every character in text has
a special control function, FALSE otherwise. Control characters are
e.g. line feed, tab, esc.
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";
}
} ?>
This example will output :
The string 'string1' consists of all control characters.
The string 'string2' does not consists of all control characters.
