Files from 27-03-26: Password Hashing and checks for password stregnth

Zweites Jahr/unterrichts_projekt/portal/functions.php

@@ -0,0 +1,47 @@
+
+
+
+<?php
+
+/**
+ * Check password strength (1/2)
+ * @param string $password password to check
+ * @return bool - true or false
+ */
+function isStrongPassword(string $password): bool
+{
+    // min. 8 Zeichen, 1 Kleinbuchstabe, 1 Großbuchstabe, 1 Zahl, 1 Sonderzeichen
+    return (bool) preg_match(
+        '/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^a-zA-Z0-9]).{8,}$/',
+        $password
+    );
+}
+
+/**
+ * Check password strength (2/2)
+ * @param string $password password to check
+ * @return bool - true or false
+ */
+function checkPasswordStrength(string $password): bool {
+    $strength = 0;
+
+    //check length
+    $length = strlen($password);
+    if($length >= 8) $strength++;
+   
+    //check if caps 
+    if(preg_match('/[A-Z]/', $password)) $strength++;
+
+    //check if lower cases 
+    if(preg_match('/[a-z]/', $password)) $strength++;
+
+    //check if numbers 
+    if(preg_match('/[0-9]/', $password)) $strength++;
+
+    //check if spec. chars 
+    if(preg_match('/[^a-zA-Z0-9]/', $password)) $strength++;
+
+    return($strength >= 5);
+   
+
+}