Codeigniter Image Manipulation Class : Resize and Crop on multiple files
resize_img()

crop_img().

<?PHP

class Imagetest extends MY_Controller {

function __construct()
{
    parent::__construct();
    $this->load->library('image_lib');
}

function index()
{
    $testimg1 = 'uploads/test/1.png';
    $testimg2 = 'uploads/test/2.png';
    $testimg3 = 'uploads/test/3.png';

    $this->resize_img($testimg1);
    $this->crop_img($testimg1);

    $this->resize_img($testimg2);
    $this->crop_img($testimg2);

    $this->resize_img($testimg3);
    $this->crop_img($testimg3);
}


function image_thumb_name($img = null)
{
    if(!empty($img)) {
        $exploded = explode('.', $img);
        return $exploded['0'] . '_thumb.' . $exploded['1'];
    }
}

function get_axis($img)
{
    // Default values
    $output['x_axis'] = 0;
    $output['y_axis'] = 0;

    // Settings
    $config['height'] = 132;
    $config['width']  = 176;

    if ($img_dim = getimagesize($img)) {
        list($thumb_width, $thumb_height) = $img_dim;
    } else {
        echo '<h1> ERROR HERE TOO</h1>';
        return false;
    }

    if ($thumb_width > $config['width']) {

        $output['x_axis'] = (($thumb_width - $config['width']) / 2) ;

    } else if ($thumb_height > $config['height']) {

        $output['y_axis'] = (($thumb_height - $config['height']) / 2);
    }
    return $output;
}

function resize_img($img)
{
    $config = array();
    echo 'Processing: '. $img .'<br/>';  // Debug

    if ($img_dim = getimagesize($img)) {
        list($image_width, $image_height) = $img_dim;
    } else {
        echo '<h1> ERROR HERE </h1>';
    }

    // create a thumbnail
    $config['image_library'] = 'GD2';
    $config['source_image'] = $img;
    $config['quality'] = 100;
    $config['height'] = 132;
    $config['width'] = 176;
    $config['create_thumb']  = TRUE;
    $config['maintain_ratio']= TRUE;
    $config['master_dim'] = ($image_width > $image_height) ? 'height' : 'width';
    $this->image_lib->initialize($config);

    if (!$this->image_lib->resize()) {
        echo $this->image_lib->display_errors();
    }

    echo '<img src="../'.$this->image_thumb_name($img).'" /> <br/>'; // Debug

    $this->image_lib->clear();
    unset($config);
}




function crop_img($img)
{
    $config2 = array();

    // Crop that thumbnail
    $config2['image_library'] = 'GD2';
    $config2['quality'] = 100;
    $config2['height'] = 132;
    $config2['width'] = 176;
    $config2['source_image']  = $this->image_thumb_name($img);
    $axis = $this->get_axis($config2['source_image']);
    $config2['x_axis'] = $axis['x_axis'];
    $config2['y_axis'] = $axis['y_axis'];
    $config2['maintain_ratio'] = FALSE;
    $config2['create_thumb'] = FALSE;
    $this->image_lib->initialize($config2);

    if (!$this->image_lib->crop()) {
        echo $this->image_lib->display_errors();
    }

    echo '<img src="../'.$config2['source_image'].'" /> <br/>'; // Debug

    $this->image_lib->clear();
    unset($config2);
}

}

$config['create_thumb'] = FALSE;
$config['new_image'] = $this->image_thumb_name($img);

var_dump($config['source_image']);