Codesnippets und Typst

Codesnippets.md

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+# Codesnippets
+
+## PHP
+
+### IPV4 --> CIDR
+
+```php
+function subnetMaskToCidr(string $mask): int
+{
+    $long = ip2long($mask);
+
+    if ($long === false) {
+        throw new InvalidArgumentException("Ungültige Subnetzmaske");
+    }
+    
+    $cidr = 0;
+    
+    for ($i = 31; $i >= 0; $i--) {
+        if (($long & (1 << $i)) !== 0) {
+            $cidr++;
+        } else {
+            break;
+        }
+    }
+    
+    return $cidr;
+
+}
+```
+
+oder
+
+```php  
+function subnetMaskToCidr(string $mask): int
+{
+    $octets = explode('.', $mask);
+    $cidr = 0;
+
+    foreach ($octets as $octet) {
+        while ($octet > 0) {
+            $cidr++;
+            $octet &= $octet - 1;
+        }
+    }
+    
+    return $cidr;
+
+}
+```
+
+