PHP: Get Image Dimension By Type

php_get_image_dimension.php

<?php

  public function getDimensions($filename, $filetype)
  {
    $image = null;
    switch ($filetype) {
      case 'image/gif':
        $image = imagecreatefromgif($filename);
        break;
      case 'image/jpeg':
      case 'image/pjpeg': 
        $image = imagecreatefromjpeg($filename);
        break;
      case 'image/png': 
        $image = imagecreatefrompng($filename);
        break;
      case 'image/bmp':
        $image = imagecreatefromwbmp($filename);
    }

    if ($image != null) {
      return array(
        'w'=>imagesx($image),
        'h'=>imagesy($image)
      );
    }

    return null;
  }