Add some security function

htmlspecialchars.php

@@ -0,0 +1,19 @@
+<?php
+// htmlspecialchars
+
+/*
+    Convert special characters to HTML entities
+    e.g. : 
+        "<" convert to "&lt;"
+        ">" convert to "&gt;"
+        ...
+*/
+$str = "The word <b>text</b> is bold";
+echo htmlspecialchars($str);
+// HTML output will be "The word &lt;b&gt;text&lt;/&gt; is bold"
+
+$str = "My name is 'Ali'";
+echo htmlspecialchars($str);
+
+$str = "What is decrement & increment ?";
+echo htmlspecialchars($str);

stripslashes.php

@@ -0,0 +1,14 @@
+<?php
+// stripslashes
+
+/*
+    # Remove backslashes
+    This function can be use for clean data received 
+    from user.
+*/
+$str = "Hello \ my name \ is Ali";
+var_dump(stripslashes($str));
+
+// and can be use for ignore escape sequences
+$str = "Wellcome \n This is world";
+var_dump(stripslashes($str));