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).
例子 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 $testcase does not consist of all letters or digits.\n";
}
}
?>
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This example will output :
The string AbCd1zyZ9 consists of all letters or digits.
The string foo!#$bar does not consists of all letters or digits. |
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See also ctype_alpha(), ctype_digit(),
and setlocale().
