Php Password validation should not contain username and full name - php

Question

I am working on password validations. All other validations are working fine. I have to add initials validation on password. Password should not contain full name or username and first/last character of username and full name. I am trying to get it with strpos function but it's not working.This is my code i had tried with 2 ways but not working.
<?php
$name = "katlina john smith";
$uname = "testinguser";
$password = "john";
$password = "kjs#123"; // first initials of name
$password = "testing#ps"; //These password format should not be accepted
if (strpos($password,$name) !== false || strpos($password,$uname) !== false) {
echo 'Username found in the password';
}
//2nd way
if (preg_match("#(($uname)|($name))#", $password))
{
echo 'Username found in the password';
}

Answer 1

Here is the complete answer
$name = "katlina john smith";
$uname = "testinguser";
$password = "john";
if ( (strpos($name,$password) !== false ) || ( strpos($uname,$password ) !==
false ) ) {
echo 'password not valid';
}

Answer 2

Use this:
$name = "katlina john smith";
$username = "testinguser";
$password = "katlina#test123";
For PHP 7:
if (strpos(strtolower($password), strtolower($username)) === false || passContainsName($name, $password)) {
echo 'password not valid in PHP 7'.PHP_EOL;
}
function passContainsName($name, $password){
foreach (explode(" ", $name) as $toCheck) {
if (strpos(strtolower($password), strtolower($toCheck)) === false) {
return true;
}
}
return false;
}
For PHP 8:
if (str_contains(strtolower($password), strtolower($username)) || passContainsName($name,$password)) {
echo 'password not valid';
}
function passContainsName($name, $password){
foreach (explode(" ", $name) as $toCheck) {
if (str_contains(strtolower($password), strtolower($toCheck))) {
return true;
}
}
return false;
}
fiddle [here] with php 7 and 8 examples1