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ctype_alnum (PHP 4 >= 4.0.4, PHP 5) ctype_alnum -- Check for alphanumeric character(s) 说明bool ctype_alnum ( string text )
Checks if all of the characters in the provided string,
text, are alphanumeric. In the standard
C locale letters are just [A-Za-z]
and the function is equivalent to
preg_match('/^[a-z0-9]*$/i', $text).
返回值
Returns TRUE if every character in text is either
a letter or a digit, FALSE otherwise.
例
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 $testcase does not consist of all letters or digits.\n";
}
}
?>
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上例将输出： The string AbCd1zyZ9 consists of all letters or digits.
The string foo!#$bar does not consists of all letters or digits. |
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