ctype_cntrl
(PHP 4 >= 4.0.4)
ctype_cntrl -- Check for control character(s)
Description
bool ctype_cntrl ( string text)
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.
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