resizes

functions.php

/**
 * On the fly image cropping based on WP 3.5 image editor
 *
 * @since 1.0
 *
 * @param    int     $id
 * @param    int     $width
 * @param    int     $height
 * @param    boolean $crop
 * @return   string
 */
function cv_resize( $id=0, $width=50, $height=50, $crop=true ){

	// Check if attachment is an image
	if ( !$id || !wp_attachment_is_image($id) )
		return false;

	$upload_dir = wp_upload_dir();
	$img_meta = wp_get_attachment_metadata( $id );

	// attachment url converted to image path
	$file = $upload_dir['basedir'] . '/' . $img_meta['file'];

	$image = wp_get_image_editor( $file );

	// legacy error explanation.
	if ( is_wp_error( $image ) )
		return $image->get_error_message();

	// generate intended file name and check if the image exists.
	$new_file_path = $image->generate_filename($suffix = $width.'x'.$height);

	// If this file already exists, return the image url.
	if(file_exists($new_file_path))
		return str_replace($upload_dir['basedir'], $upload_dir['baseurl'], $new_file_path);

	// resize image and save
	$image->resize( $width, $height, $crop );
	$new_image_info = $image->save();

	// convert path to url
	$url = str_replace($upload_dir['basedir'], $upload_dir['baseurl'], $new_image_info['path']);

	return $url;
}

function cv_resize_cached( $id=0, $width=50, $height=50, $crop=true ){
	$transient = 'cv_gallery_'.$id.'_'.$width.'_'.$height.'_'.$crop;

	if ( false === ( $result = get_transient( $transient ) ) ) {
		$result = cv_resize( $id, $width, $height, $crop );
		set_transient( $transient, $result, $timeout );
	}
	return $result;
}

function cv_resize_thumbnail( $id=0, $width=50, $height=50, $crop=true, $attr = '' ){

		$src = cv_resize_cached( $id, $width, $height, $crop );
		$hwstring = image_hwstring($width, $height);
		$size = $width . 'x' . $height;
		$attachment = get_post($id);

		$default_attr = array(
			'src'	=> $src,
			'class'	=> "attachment-$size",
			'alt'	=> trim(strip_tags( get_post_meta($id, '_wp_attachment_image_alt', true) )), // Use Alt field first
		);

		if ( empty($default_attr['alt']) )
			$default_attr['alt'] = trim(strip_tags( $attachment->post_excerpt )); // If not, Use the Caption
		if ( empty($default_attr['alt']) )
			$default_attr['alt'] = trim(strip_tags( $attachment->post_title )); // Finally, use the title


		$attr = wp_parse_args($attr, $default_attr);
		$attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment );
		$attr = array_map( 'esc_attr', $attr );
		$html = rtrim("<img $hwstring");
		foreach ( $attr as $name => $value ) {
			$html .= " $name=" . '"' . $value . '"';
		}
		$html .= ' />';

	return $html;
}

function cv_resize_gallery( $ids=array(), $width=50, $height=50, $crop=true, $timeout=DAY_IN_SECONDS ){
	$list = implode('_', $ids);
	$transient = 'cv_gallery_'.$list.'_'.$width.'_'.$height.'_'.$crop;

	if ( false === ( $result = get_transient( $transient ) ) ) {
		$result = array();
		foreach ($ids as $id) {
			$result[] = cv_resize( $id, $width, $height, $crop );
		}

		set_transient( $transient, $result, $timeout );

	}
	return $result;
}

function cv_resize_sizes( $id=0, $sizes=array(), $crop=true, $timeout=DAY_IN_SECONDS ){

	$dimensions = array_map(function($item) { return $item['width'].'x'.$item['height']; }, $sizes);

	$output = implode('_', $dimensions);

	$transient = 'cv_sizes_'.$id.'_'.md5($output).'_'.$crop;



	if ( false === ( $result = get_transient( $transient ) ) ) {
		$result = array();
		foreach ($sizes as $size) {
			$width = $size['width'];
			$height = $size['height'];
			$result[] = cv_resize( $id, $width, $height, $crop );
		}

		set_transient( $transient, $result, $timeout );

	}
	return $result;
}