我想知道如何检查变量是否包含数字0到9和字符a到z,比如:
if($string contains numbers[0-9] and characters[a-z])
{
echo "true";
} else {echo "false";}
您可以使用regex。预匹配
$str = "aab1230";
if(preg_match('/^[0-9a-z]+$/', $str)) {
// contains only characters [0-9] and/or [a-z]
}