ctype_cntrl

(PHP 4 >= 4.0.4, PHP 5)

ctype_cntrl -- Check for control character(s)

Descrição

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.

Parâmetros

text

The tested string.

Valores de retornado

Returns TRUE if every character in text is a letter from the current locale, FALSE otherwise.

Exemplos

Exemplo 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";
    }
}
?>

O exemplo acima irá imprimir:

The string 'string1' consists of all control characters.
The string 'string2' does not consists of all control characters.

Veja também

ctype_print()