Manual do PHP
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# ctype_alnum

(PHP 4 >= 4.0.4, PHP 5)

ctype_alnum -- Check for alphanumeric character(s)

## Description

bool ctype_alnum ( string text )

Returns `TRUE` if every character in text is either a letter or a digit, `FALSE` otherwise. In the standard C locale letters are just [A-Za-z] and the function is equivalent to preg_match('/^[a-z0-9]*$/i', $text).

Exemplo 1. A ctype_alnum() example (using the default locale)
`<?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 $testcase does not consist of all letters or digits.\n"; } } ?>`
O exemplo acima irá imprimir:
    The string AbCd1zyZ9 consists of all letters or digits.
    The string foo!#$bar does not consists of all letters or digits.

See also ctype_alpha(), ctype_digit(), and setlocale().

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