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function resize($img, $w, $h, $newfilename) { //Check if GD extension is loaded if (!extension_loaded('gd') && !extension_loaded('gd2')) { trigger_error("GD is not loaded", E_USER_WARNING); return false; } //Get Image size info $imgInfo = getimagesize($img); switch ($imgInfo[2]) { case 1: $im = imagecreatefromgif($img); break; case 2: $im = imagecreatefromjpeg($img); break; case 3: $im = imagecreatefrompng($img); break; default: trigger_error('Unsupported filetype!', E_USER_WARNING); break; } //If image dimension is smaller, do not resize if ($imgInfo[0] <= $w && $imgInfo[1] <= $h) { $nHeight = $imgInfo[1]; $nWidth = $imgInfo[0]; }else{ //yeah, resize it, but keep it proportional $nWidth = $w; $nHeight = $h; } $nWidth = round($nWidth); $nHeight = round($nHeight); $newImg = imagecreatetruecolor($nWidth, $nHeight); /* Check if this image is PNG or GIF, then set if Transparent*/ if(($imgInfo[2] == 1) OR ($imgInfo[2]==3)){ imagealphablending($newImg, false); imagesavealpha($newImg,true); $transparent = imagecolorallocatealpha($newImg, 255, 255, 255, 127); imagefilledrectangle($newImg, 0, 0, $nWidth, $nHeight, $transparent); } imagecopyresampled($newImg, $im, 0, 0, 0, 0, $nWidth, $nHeight, $imgInfo[0], $imgInfo[1]); //Generate the file, and rename it to $newfilename switch ($imgInfo[2]) { case 1: imagegif($newImg,$newfilename); break; case 2: imagejpeg($newImg,$newfilename); break; case 3: imagepng($newImg,$newfilename); break; default: trigger_error('Failed resize image!', E_USER_WARNING); break; } return $newfilename; } ?>