PHP

PHP Image Resize

<?php
if (isset($_POST["submit"])) {
    if (is_array($_FILES)) {
        $file = $_FILES['myImage']['tmp_name'];
        $source_properties = getimagesize($file);
        $image_type = $source_properties[2];
        if ($image_type == IMAGETYPE_JPEG) {
            $image_resource_id = imagecreatefromjpeg($file);
            $target_layer = fn_resize($image_resource_id, $source_properties[0], $source_properties[1]);
            imagejpeg($target_layer, $_FILES['myImage']['name'] . "_thump.jpg");
        } elseif ($image_type == IMAGETYPE_GIF) {
            $image_resource_id = imagecreatefromgif($file);
            $target_layer = fn_resize($image_resource_id, $source_properties[0], $source_properties[1]);
            imagegif($target_layer, $_FILES['myImage']['name'] . "_thump.gif");
        } elseif ($image_type == IMAGETYPE_PNG) {
            $image_resource_id = imagecreatefrompng($file);
            $target_layer = fn_resize($image_resource_id, $source_properties[0], $source_properties[1]);
            imagepng($target_layer, $_FILES['myImage']['name'] . "_thump.png");
        }
    }
}

function fn_resize($image_resource_id, $width, $height)
{
    $target_width = 200;
    $target_height = 200;
    $target_layer = imagecreatetruecolor($target_width, $target_height);
    imagecopyresampled($target_layer, $image_resource_id, 0, 0, 0, 0, $target_width, $target_height, $width, $height);
    return $target_layer;
}
?>
<form name="frmImageResize" action="" method="post"
	enctype="multipart/form-data">
	<input type="file" name="myImage" /> <input type="submit" name="submit" value="Submit" />
</form>