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PHP: ctype_alnum - Manual
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ctype_alpha" width="11" height="7"/> <文字型 (ctype) 関数
Last updated: Thu, 31 May 2007

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ctype_alnum

(PHP 4 >= 4.0.4, PHP 5)

ctype_alnum — 英数字かどうかを調べる

説明

bool ctype_alnum ( string $text )

与えられた文字列 text のすべての文字が英字または 数字であるかどうかを調べます。標準の C ロケールの場合、 文字は [A-Za-z] で、この関数は preg_match('/^[a-z0-9]+$/iD', $text) と等価です。

パラメータ

text

調べる文字列。

返り値

text のすべての文字が英字または数字だった場合に TRUE 、そうでない場合に FALSE を返します。

例 407. A ctype_alnum() の例 (デフォルトのロケールを使用)

<?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";
    }
}
?>

上の例の出力は以下となります。


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

    

参考

ctype_alpha()
ctype_digit()
setlocale()



add a note add a note User Contributed Notes
ctype_alnum
Sinured
23-Jul-2007 02:13
Caution: ctype_alnum() will return false on integers.

<?php
var_dump
(ctype_alnum('3')); // true
var_dump(ctype_alnum(3)); // false
?>

See http://bugs.php.net/bug.php?id=42007 .
raj
10-Jul-2007 08:54
When checking strings with multiple words for non alphanumeric characters ctype_alnum would consider space as non alphanumeric character as well.

So to check a string with multiple words for non alphanumeric characters use str_replace

foreach ($imported_queries as $check_aplhanum) {
            $check_aplhanum = str_replace (" ", "", $check_aplhanum);
            if (!(ctype_alnum($check_aplhanum))) {
                echo "Query string contains alphanumeric characters";
            }
        }

 
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