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 * Title        : Aqua Resizer
 * Description  : Resizes WordPress images on the fly
 * Version      : 1.1.3
 * Author       : Syamil MJ
 * Author URI   : http://aquagraphite.com
 * License      : WTFPL - http://sam.zoy.org/wtfpl/
 * Documentation : https://github.com/sy4mil/Aqua-Resizer/
 *
 * @param string $url - (required) must be uploaded using wp media uploader
 * @param int $width - (required)
 * @param int $height - (optional)
 * @param bool $crop - (optional) default to soft crop
 * @param bool $single - (optional) returns an array if false
 * @uses wp_upload_dir()
 * @uses image_resize_dimensions()
 * @uses image_resize()
 *
 * @return str|array
 */

function aqua_resizer( $url, $width, $height = null, $crop = null, $single = true ) {  
    // validate inputs
    if( !$url OR !$width ) return false;

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

    // check if $img_url is local
    if( strpos( $url, home_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 original size is smaller
    if( $width >= $orig_w ) {
        if( !$dst_h ) {
            // can't resize, so return original url
            $img_url = $url;
            $dst_w = $orig_w;
            $dst_h = $orig_h;
        } else {
            // else check if cache exists
            if( file_exists( $destfilename ) && getimagesize( $destfilename ) ) {
                $img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
            } else {
                // resize and return the new resized image url
                $resized_img_path = image_resize( $img_path, $width, $height, $crop );
                $resized_rel_path = str_replace( $upload_dir, '', $resized_img_path );
                $img_url = $upload_url . $resized_rel_path;
            }
        }
    }
    // else check if cache exists
    elseif( file_exists( $destfilename ) && getimagesize( $destfilename ) ) {
        $img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
    } else {
        // resize the image and return the new resized image url
        $resized_img_path = image_resize( $img_path, $width, $height, $crop );
        $resized_rel_path = str_replace( $upload_dir, '', $resized_img_path );
        $img_url = $upload_url . $resized_rel_path;
    }

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

    return $image;
}








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