http://webdeveloperswall.com/php/crop-image-script

crop image wordpress

<?php
/**
 * wdw_crop_img (http://webdeveloperswall.com/wordpress/crop-image-script)
 * crops the image to given width and height
 * Parameters :-
 * 	$image_url : string : absolute url to the image 
 * 	$width: int : desired width after cropping
 * 	$height : desired height after cropping
 * 	$upload_directory : name of the target directory (directoty inside wp-content>uploads folder)
 * Returns :- an array containing errors/success messages, new(cropped) file path and cropped file url
		returned array example:
			$msg['message'] will be either 'success' or 'error'
			$msg['path'] will be either blank (error) or something like c:\\path\to\wordpress\wp-content\uploads\myuploads\cropped_image.jpg
			$msg['url'] will be either blank (error) or something like http://yourdomain.com/wp-content/uploads/myuploads/cropped_image.jpg
 */
function wdw_crop_img($image_url, $i_width, $i_height, $upload_directory){
	$msg = array(
		'message'	=> '',
		'path'		=> '',
		'url'		=>''
	);
	
	$upl_dir = wp_upload_dir();
	//an array : $upload_directory[basedir] => C:\path\to\wordpress\wp-content\uploads 
	$upload_folder = $upl_dir['basedir']."/" . $upload_directory;
	$upload_url = $upl_dir['baseurl']."/" . $upload_directory;
	$new_name = "img_" .uniqid(). uniqid() . ".jpg";
	$filename = $upload_folder . "/" . $new_name;
	$fileurl = $upload_url . "/" . $new_name;
	
	$image = imagecreatefromstring(file_get_contents($image_url));

	$thumb_width = $i_width;
	$thumb_height = $i_height;

	$width = imagesx($image);
	$height = imagesy($image);

	$original_aspect = $width / $height;
	$thumb_aspect = $thumb_width / $thumb_height;

	if ( $original_aspect >= $thumb_aspect )
	{
	   // If image is wider than thumbnail (in aspect ratio sense)
	   $new_height = $thumb_height;
	   $new_width = $width / ($height / $thumb_height);
	}
	else
	{
	   // If the thumbnail is wider than the image
	   $new_width = $thumb_width;
	   $new_height = $height / ($width / $thumb_width);
	}

	$thumb = imagecreatetruecolor( $thumb_width, $thumb_height );
	try  {
		// Resize and crop
		imagecopyresampled($thumb,
						   $image,
						   0 - ($new_width - $thumb_width) / 2, // Center the image horizontally
						   0 - ($new_height - $thumb_height) / 2, // Center the image vertically
						   0, 0,
						   $new_width, $new_height,
						   $width, $height);
		imagejpeg($thumb, $filename, 80);
		$msg['message'] = 'success';
		$msg['url'] = $fileurl;
		$msg['path'] = $filename;
	}
	catch(Exception $e){
		$msg['message'] = 'error';
	}
	return $msg;
}
?>