update,

School-Management-System/_hidden/scratch/helloworld_in_array.php

@@ -0,0 +1,10 @@
+<?php
+  $a = [1,2,3,4,5];
+  if (in_array(1, $a)){
+    echo 'helloworld 1';
+  }
+
+  if (in_array(10, $a)){
+    echo 'helloworld 10';
+  }
+