ctype_alnum

Check for alphanumeric character(s) (PHP 4 >= 4.0.4, PHP 5)
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).

参数

text

The tested string.

返回值

Returns TRUE if every character in text is either a letter or a digit, FALSE otherwise.

范例

例 379. 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";
   }
}
?>

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.