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This function support crop and resize JPEG, GIF, PNG image.

<?php
/**
 * @author phptuts
 * @copyright 2012
 * @link http://tutorialspots.com/
 *
 * @return resource resized image resource
 * @param string $img path to image to be resized
 * @param int $width
 * @param int $height
 */

function image_crop_resize($img, $width, $height)
{
    $infos = @getimagesize($img);

    if ($infos == false)
    {
        trigger_error("Unknown problem trying to open image.", E_USER_ERROR);
    }
    switch ($infos[2])
    {
        case 1:
            $src = imagecreatefromgif($img);
            break;
        case 2:
            $src = imagecreatefromjpeg($img);
            break;
        case 3:
            $src = imagecreatefrompng($img);
            break;
        default:
            trigger_error("Support JPEG GIF PNG only.", E_USER_ERROR);
            break;
    }
    if ($src == false)
    {
        trigger_error("Unknown problem trying to open image.", E_USER_ERROR);
    }
    $ratio = (($infos[0] / $infos[1]) < ($width / $height)) ? $width / $infos[0] : $height / $infos[1];
    $x = max(0, round($infos[0] / 2 - ($width / 2) / $ratio));
    $y = max(0, round($infos[1] / 2 - ($height / 2) / $ratio));

    $resized = imagecreatetruecolor($width, $height);
    $result = imagecopyresampled($resized, $src, 0, 0, $x, $y, $width, $height, round($width /
        $ratio, 0), round($height / $ratio));
    if ($result == false)
    {
        trigger_error("Error trying to resize and crop image.", E_USER_ERROR);
    } else
    {
        return $resized;
    }
}
?>

Example of usage: online demo

<?php
header("Content-Type: image/png");
imagepng(image_crop_resize('http://tutorialspots.com/wp-content/uploads/2012/08/logo1.png', 200, 200));
?>

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