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check password strength php

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<!DOCTYPE html>
<html lang="en-US">
<head>
</head>
<body>

<?php

$password = "your password";

if( strlen($password) < 8 ) {
$error .= "Password too short! ";
}

if( strlen($password) > 20 ) {
$error .= "Password too long! ";
}

if( !preg_match("#[0-9]+#", $password) ) {
$error .= "Password must include at least one number! ";
}

if( !preg_match("#[a-z]+#", $password) ) {
$error .= "Password must include at least one letter! ";
}

if( !preg_match("#[A-Z]+#", $password) ) {
$error .= "Password must include at least one CAPS! ";
}

if( !preg_match("#\W+#", $password) ) {
$error .= "Password must include at least one symbol! ";
}

if($error){

echo $error;

} else {

echo "Your password is strong.";

}

?>

</body>
</html>