Modified. Code cleaned for readability

avatar.php

@@ -13,32 +13,33 @@ function generate_grid(){
 }
 
 // Configurable variables
-$config = (object)array();
-$config->width = $config->height = 300;
+$config = (object) array();
+$config->width = 300;
+$config->height = $config->width;
 $config->square = $config->width / 5;
 
-$canvas = imagecreatetruecolor($config->width, $config->height);
-
-// Allocate colors
-$white = imagecolorallocate($canvas, 255, 255, 255);
-$black = imagecolorallocate($canvas, 51, 51, 51);
-$color = imagecolorallocate($canvas, rand(0,255), rand(0,255), rand(0,255));
+// Initiate image and allocate colors
+$canvas = imagecreatetruecolor( $config->width, $config->height );
+$white = imagecolorallocate( $canvas, 255, 255, 255 );
+$black = imagecolorallocate( $canvas, 51, 51, 51 );
+$color = imagecolorallocate( $canvas, rand(0,255), rand(0,255), rand(0,255) );
 
 $grid = generate_grid();
-foreach($grid as $y=>$row){
-    foreach($row as $x=>$cell){
-        $x1 = $x * $config->square;
+foreach( $grid as $y0 => $row ){
+    foreach( $row as $x- => $cell ){
+        $x1 = $x0 * $config->square;
         $x2 = $x1 + $config->square;
-        $y1 = $y * $config->square;
+        $y1 = $y0 * $config->square;
         $y2 = $y1 + $config->square;
-        imagefilledrectangle($canvas, $x1, $y1, $x2, $y2, $cell?$color:$white);
+        $cell_color = $cell ? $color : $white;
+        imagefilledrectangle( $canvas, $x1, $y1, $x2, $y2, $cell_color );
     }
 }
 
 // Output and free from memory
 $request_uri = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : 'avatar.php';
 if( preg_match('/\/avatar\.(php|png|jpg|jpeg|gif)/', $request_uri, $match) ){
-    switch($match[1]){
+    switch( $match[1] ){
         case 'jpeg':
         case 'jpg':
             header('Content-Type: image/jpeg');