Check for password strength, password should be at least n characters, contain at least one number, contain at least one lowercase letter, contain at least one uppercase letter, contain at least one special character.

password_strength.php

<?php

$password_length = 8;

function password_strength($password) {
	$returnVal = True;

	if ( strlen($password) < $password_length ) {
		$returnVal = False;
	}

	if ( !preg_match("#[0-9]+#", $password) ) {
		$returnVal = False;
	}

	if ( !preg_match("#[a-z]+#", $password) ) {
		$returnVal = False;
	}

	if ( !preg_match("#[A-Z]+#", $password) ) {
		$returnVal = False;
	}

	if ( !preg_match("/[\'^£$%&*()}{@#~?><>,|=_+!-]/", $password) ) {
		$returnVal = False;
	}

	return $returnVal;

}
?>

great , code work for me 👍

It must contain between 8 and 32 characters. Use only characters from the following set: ! # $ % & ( ) * + , - . / 0123456789 : ; < = > ? @ ABCDEFGHIJKLMNOPQRSTUVWXYZ [ \ ] _ ` abcdefghijklmnopqrstuvwxyz { | } ~

It must contain at least 1 capital letter(s) (ABCDEFGHIJKLMNOPQRSTUVWXYZ).

It must contain at least 1 numeric character(s) (0123456789).

It must not contain more than 2 identical consecutive characters (AAA, iiii, $$$$$ ...).

It must not contain your user name.

It must not contain your email address.

It must not contain your first name.

It must not contain your last name