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ctype_alpha> <Funzioni Ctype
[edit] Last updated: Fri, 17 May 2013

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ctype_alnum

(PHP 4 >= 4.0.4, PHP 5)

ctype_alnumControlla i caratteri alfanumerici

Descrizione

bool ctype_alnum ( string $testo )

Restituisce TRUE se ogni carattere di testo è una lettera o una cifra, FALSE in caso contrario. Nell'ambiente standard del C le lettere sono solamente [A-Za-z] e la funzione è equivalente a preg_match('/^[a-z0-9]*$/i', $text).

Example #1 Esempio di uso di ctype_alnum() (utilizzando le impostazioni locali di default)

<?php
$strings 
= array('AbCd1zyZ9''foo!#$bar');
foreach (
$strings as $testcase) {
    if (
ctype_alnum($testcase)) {
        echo 
"The string $testcase consists of all letters or digits.\n";
    } else {
        echo 
"The string $testcase does not consist of all letters or digits.\n";
    }
}
?>

Questo esempio visualizzerà :

The string AbCd1zyZ9 consists of all letters or digits.
The string foo!#$bar does not consists of all letters or digits.

Vedere anche ctype_alpha(), ctype_digit() e setlocale().



ctype_alpha> <Funzioni Ctype
[edit] Last updated: Fri, 17 May 2013
 
add a note add a note User Contributed Notes ctype_alnum - [3 notes]
up
8
thinice at gmail dot com
3 years ago
ctype_alnum() is a godsend for quick and easy username/data filtering when used in conjunction with str_replace().

Let's say your usernames have dash(-) and underscore(_) allowable and alphanumeric digits as well.

Instead of a regex you can trade a bit of performance for simplicity:

<?php
$sUser
= 'my_username01';
$aValid = array('-', '_');

if(!
ctype_alnum(str_replace($aValid, '', $sUser))) {
    echo
'Your username is not properly formatted.';
}
?>
up
1
Rory
3 years ago
Just for the record, Gentoo doesn't include this function by default. You'll have to recompile PHP with the "ctype" USE flag.
up
0
Anonymous
3 months ago
Quicktip: If ctype is not enabled by default on your server, replace ctype_alnum($var) with preg_match('/^[a-zA-Z0-9]+$/', $var).

 
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