(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_alnum — 检测字母数字式字符
示例 #1 ctype_alnum() 示例 (使用默认的区域设置)
<?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 $testcase does not consist of all letters or digits.\n";
}
}
?>以上示例会输出：
The string AbCd1zyZ9 consists of all letters or digits. The string foo!#$bar does not consist of all letters or digits.