<?php
/**
 *
 */
function storeup_img_resize( $storeup_postid = null ,$src = null , $width, $height, $class = null, $alt = null ) {

	$title = $storeup_postid ? get_the_title ( $storeup_postid ) :'';

	$out ='';

	if ( $class ) {	$class = ' class="'.$class.'"';	}
	if ( $alt ) {
		$alt_txt = ' alt="'.$alt.'"';
	} else {
	    $alt_txt = ' alt="'.$title.'"';
	}

	if ( '' === $src ) {
		$imagesrc = wp_get_attachment_image_src( get_post_thumbnail_id( $storeup_postid ), 'full', false, '' );
		$src = $imagesrc[0];
	}

	$image = storeup_aqua_resize( $src, $width, $height, true );

	if( $image !== '' ) {
		$out .= '<img  '.$class.' '.$alt_txt.' src="'.esc_url( $image ).'" width="'.$width.'" height="'.$height.'">';
	}
	return  $out;
}

function storeup_aqua_resize( $url, $width, $height = null, $crop = null, $single = true ) {

	// define upload path & dir
	$upload_info = wp_upload_dir();
	$upload_dir  = $upload_info['basedir'];
	$upload_url  = $upload_info['baseurl'];

	$http_prefix = "http://";
	$https_prefix = "https://";

	 /**
	  *	if the $url scheme differs from $upload_url scheme, make them match
	  *	if the schemes differe, images don't show up.
	  */
	if( ! strncmp( $url, $https_prefix, strlen( $https_prefix ) ) ){
		 //if url begins with https:// make $upload_url begin with https:// as well
		$upload_url = str_replace($http_prefix,$https_prefix,$upload_url);
	}
	elseif( ! strncmp( $url, $http_prefix, strlen( $http_prefix ) ) ){

		//if url begins with http:// make $upload_url begin with http:// as well
		$upload_url = str_replace($https_prefix,$http_prefix,$upload_url);
	}

	// check if $img_url is local
	if( strpos( $url, $upload_url ) === false ){
		return false;
	}

	// define path of image
	$rel_path = str_replace( $upload_url, '', $url);
	$img_path = $upload_dir . $rel_path;

	// check if img path exists, and is an image indeed
	if( !file_exists( $img_path ) OR !getimagesize( $img_path ) ){
		return false;
	}
	// get image info
	$info = pathinfo($img_path);
	$ext  = $info['extension'];

	list( $orig_w,$orig_h ) = @getimagesize( $img_path );

	// get image size after cropping
	$dims = image_resize_dimensions( $orig_w, $orig_h, $width, $height, $crop );
	$dst_w = $dims[4];
	$dst_h = $dims[5];

	// use this to check if cropped image already exists, so we can return that instead
	$suffix 		= "{$dst_w}x{$dst_h}";
	$dst_rel_path 	= str_replace( '.'.$ext, '', $rel_path);
	$destfilename 	= "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";

	if( !$dst_h ) {
		//can't resize, so return original url
		$img_url = $url;
		$dst_w = $orig_w;
		$dst_h = $orig_h;
	}
	//else check if cache exists
	elseif( file_exists( $destfilename ) && getimagesize( $destfilename )) {
		$img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
	}
	//else, we resize the image and return the new resized image url
	else {
		// Note: This pre-3.5 fallback check will edited out in subsequent version
		$editor = wp_get_image_editor($img_path);

		if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) ){
			return false;
		}
		$resized_file = $editor->save();

		if ( ! is_wp_error( $resized_file ) ) {
			$resized_rel_path = str_replace( $upload_dir, '', $resized_file['path']);
			$img_url = $upload_url . $resized_rel_path;
		} else {
			return false;
		}
	}

	if( $single ) {
		$image = $img_url;
	} else {
		$image = array(
			0 => $img_url,
			1 => $dst_w,
			2 => $dst_h
		);
	}

	return $image;
}
