Added Link Guessing checkbox to Dashboard->Settings

functions.php

@@ -264,4 +264,77 @@ function uc_redirect_403() {
 
 add_action( 'template_redirect', 'uc_redirect_403' );
 
-?>
+
+//====================================================
+// WordPress Link Guessing Option adds a checkbox
+// to the Settings page
+//====================================================
+
+add_action( 'admin_init', 'link_guessing_settings_init' );
+
+//====================================================
+// Link Guessing - ON or OFF ?
+//====================================================
+
+add_action( 'wp_loaded', function ()
+{
+    $checked = get_option( 'link_guessing' );
+	if ( empty( $checked ) ){
+		remove_filter('template_redirect', 'redirect_canonical');
+	}else{
+		add_filter('template_redirect', 'redirect_canonical');
+	}
+});
+
+//====================================================
+// Link Guessing init
+//====================================================
+
+function link_guessing_settings_init(){
+
+    /* Register Settings */
+    register_setting(
+        'general',				// Options group
+        'link_guessing',		// Option name/database
+        'link_guessing_sanitize' // sanitize callback function
+    );
+
+    /* Create settings section */
+    add_settings_section(
+        'link_guessing_section_id',     // Section ID
+        '',  				// Section title  - leave it blank
+        null, 				// Section description callback function - we don't need it
+        'general'           // Settings page slug
+    );
+
+    /* Create settings field */
+    add_settings_field(
+        'link_guessing_field_id',       // Field ID
+        'Link Guessing',       			// Field title 
+        'link_guessing_field_callback', // Field callback function
+        'general',                    	// Settings page slug
+        'link_guessing_section_id'      // Section ID
+    );
+}
+
+ //====================================================
+/* Sanitize Callback Function */
+//====================================================
+
+function link_guessing_sanitize( $input ){
+    return isset( $input ) ? true : false;
+}
+
+ //====================================================
+/* Settings Field Callback */
+//====================================================
+
+function link_guessing_field_callback(){
+	?>
+    <label for="link_guessing">
+    	<?php
+		$checked = get_option( 'link_guessing' );
+		?>
+        <input id="link_guessing" type="checkbox" name="link_guessing" <?php checked($checked) ?>> Check to enable Wordpress link guessing
+    </label>
+<?php } ?>