Remove duplicate characters from a string

Strings/RemoveDuplicatedCharacters.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * The function loops through each character in the input string.
+ * It uses an array $seen to keep track of characters that have already been added to the output string.
+ * If a character hasn't been seen, it is appended to the result string, and the character is marked as seen.
+ * The function returns the modified string with duplicate characters removed.
+ */
+
+ function removeDuplicatedCharacters($inputString) {
+    // Initialize an empty array to keep track of seen characters
+    $seen = [];
+
+    // Initialize an empty string for the result
+    $result = '';
+
+    // Loop through each character in the input string
+    for ($i = 0; $i < strlen($inputString); $i++) {
+        $char = $inputString[$i];
+
+        // Check if the character has already been seen
+        if (!in_array($char, $seen)) {
+            // Add the character to the result and mark it as seen
+            $result .= $char;
+            $seen[] = $char;
+        }
+    }
+
+    return $result;
+}