WP resize images

resize-images-functions-snippet.txt

///////////////////////////////////////////////////////////////////
//  RESIZE IMAGES ON THE FLY
///////////////////////////////////////////////////////////////////

require_once(TEMPLATEPATH . '/functions/resize.php');

resize-images-snippet.php

<?php 
		$thumb = get_post_thumbnail_id(); 
		$image = vt_resize( $thumb, '', 150, 150, true );
?>
<img src="<?php echo $image['url']; ?>" alt="<?php the_title(); ?>" title="" />

resize.php

<?php
if (!function_exists('vt_resize'))
{
    function vt_resize($attach_id = null, $img_url = null, $width, $height, $crop = false)
    {
        if ($attach_id)
        {
            $image_src = wp_get_attachment_image_src($attach_id, 'full');
            $file_path = get_attached_file($attach_id);
        }
        else if ($img_url)
        {
            $file_path = parse_url($img_url);
            $file_path = $_SERVER['DOCUMENT_ROOT'] . $file_path['path'];
            if (file_exists($file_path) === false)
            {
                global $blog_id;
                $file_path = parse_url($img_url);
                if (preg_match("/files/", $file_path['path']))
                {
                    $path = explode('/', $file_path['path']);
                    foreach ($path as $k => $v)
                    {
                        if ($v == 'files')
                        {
                            $path[$k - 1] = 'wp-content/blogs.dir/' . $blog_id;
                        }
                    }
                    $path = implode('/', $path);
                }
                $file_path = $_SERVER['DOCUMENT_ROOT'] . $path;
            }
            $orig_size    = getimagesize($file_path);
            $image_src[0] = $img_url;
            $image_src[1] = $orig_size[0];
            $image_src[2] = $orig_size[1];
        }
        $file_info = pathinfo($file_path);
        $base_file = $file_info['dirname'] . '/' . $file_info['filename'] . '.' . $file_info['extension'];
        if (!file_exists($base_file))
            return;
        $extension        = '.' . $file_info['extension'];
        $no_ext_path      = $file_info['dirname'] . '/' . $file_info['filename'];
        $cropped_img_path = $no_ext_path . '-' . $width . 'x' . $height . $extension;
        if ($image_src[1] > $width)
        {
            if (file_exists($cropped_img_path))
            {
                $cropped_img_url = str_replace(basename($image_src[0]), basename($cropped_img_path), $image_src[0]);
                $vt_image        = array(
                    'url' => $cropped_img_url,
                    'width' => $width,
                    'height' => $height
                );
                return $vt_image;
            }
            if ($crop == false or !$height)
            {
                $proportional_size = wp_constrain_dimensions($image_src[1], $image_src[2], $width, $height);
                $resized_img_path  = $no_ext_path . '-' . $proportional_size[0] . 'x' . $proportional_size[1] . $extension;
                if (file_exists($resized_img_path))
                {
                    $resized_img_url = str_replace(basename($image_src[0]), basename($resized_img_path), $image_src[0]);
                    $vt_image        = array(
                        'url' => $resized_img_url,
                        'width' => $proportional_size[0],
                        'height' => $proportional_size[1]
                    );
                    return $vt_image;
                }
            }
            $img_size = getimagesize($file_path);
            if ($img_size[0] <= $width)
                $width = $img_size[0];
            if (!function_exists('imagecreatetruecolor'))
            {
                echo 'GD Library Error: imagecreatetruecolor does not exist - please contact your webhost and ask them to install the GD library';
                return;
            }
            $editor = wp_get_image_editor($file_path);
            if (is_wp_error($editor))
                return $editor;
            $editor->set_quality(100);
            $resized   = $editor->resize($width, $height, $crop);
            $dest_file = $editor->generate_filename(NULL, NULL);
            $saved     = $editor->save($dest_file);
            if (is_wp_error($saved))
                return $saved;
            $new_img_path = $dest_file;
            $new_img_size = getimagesize($new_img_path);
            $new_img      = str_replace(basename($image_src[0]), basename($new_img_path), $image_src[0]);
            $vt_image     = array(
                'url' => $new_img,
                'width' => $new_img_size[0],
                'height' => $new_img_size[1]
            );
            return $vt_image;
        }
        $vt_image = array(
            'url' => $image_src[0],
            'width' => $width,
            'height' => $height
        );
        return $vt_image;
    }
}
?>