Image resizeing using php and store in a particular folder

<?php

function resizeImage($source_image, $target_image, $crop_area)
{    // get image name with image extension     $source_file_name = basename($source_image);

    $source_image_type = substr($source_file_name, -3, 3);   
    // create an image resource from the source image      switch(strtolower($source_image_type))
    {
        case 'jpg':
            $original_image = imagecreatefromjpeg($source_image);
            break;
           
        case 'gif':
            $original_image = imagecreatefromgif($source_image);
            break;

        case 'png':
            $original_image = imagecreatefrompng($source_image);
            break;   
       
        default:
            trigger_error('cropImage(): Invalid source image type', E_USER_ERROR);
            return false;
    }   
    // create a blank image having the same width and height as the crop area
    // this will be our cropped image    $cropped_image = imagecreatetruecolor($crop_area['width'], $crop_area['height']);   
    // copy the crop area from the source image to the blank image created above    imagecopy($cropped_image, $original_image, 0, 0, $crop_area['left'], $crop_area['top'],
              $crop_area['width'], $crop_area['height']);    
    // detect target image type from extension   $target_file_name = basename($target_image);
    $target_image_type = substr($target_file_name, -3, 3);   
    // save the cropped image to disk    switch(strtolower($target_image_type))
    {
        case 'jpg':
            imagejpeg($cropped_image, $target_image, 100);
            break;
           
        case 'gif':
            imagegif($cropped_image, $target_image);
            break;

        case 'png':
            imagepng($cropped_image, $target_image, 0);
            break;   
       
        default:
            trigger_error('cropImage(): Invalid target image type', E_USER_ERROR);
            imagedestroy($cropped_image);
            imagedestroy($original_image);
            return false;
    }   
    // release image resources    imagedestroy($cropped_image);
    imagedestroy($original_image);
   
    return true;
}
?>

<?php 
// using the function to resize an image
$source_image = 'image.jpg';

$newname = basename($source_image);

//image location for to store image
$target_image = 'thumbs/'.$newname;

//image resource for image on screen
$newimage_path = 'thumbs/'.$newname;

$crop_area = array('top' => 100, 'left' => 100, 'height' => 100, 'width' => 100);

resizeImage($source_image, $target_image, $crop_area);

echo '<img src="'.$newimage_path.'" ><p>';
 
?>

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