TODO finish

20240926/char_check.php

@@ -0,0 +1,14 @@
+<?php
+
+$valid_input = $_POST['input_text'];
+
+if (isset($_POST['input_char'])){
+    $locations = array();
+    for ($i=0; $i < strlen($valid_input); $i++) { 
+        if ($_POST['input_char'] == $valid_input[i]){
+            array_push($locations, $i);
+        }
+    }
+
+    echo $locations[0];
+}