PHP verification code is not case sensitive

php verification code is not case-sensitive

First we use the strtolower function on the verification code stored in SESSION to It is converted to lowercase; then the content submitted by the user is also converted to lowercase using the strtolower function; and finally the comparison is done.

Code:

session_start(); $str_number = trim($_POST['number']); if(strtolower($_SESSION['rand'])==strtolower($str_number )){ echo "验证码正确"; }else{ echo "验证码不正确"; }

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