wp_handle_upload() を使用して、ユーザーが画像をバックエンドでアップロードできるようにし、アップロードする前に画像をカスタムサイズにサイズ変更したいと思います。これを達成するためにプラグインを使用せずに何か方法はありますか?
あなたはこれを使用することができます:
function wpse128538_resize($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, $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: pre-3.5 fallback check
if (function_exists('wp_get_image_editor')) {
$editor = wp_get_image_editor($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;
}
} else {
$resized_img_path = image_resize($img_path, $width, $height, $crop);
if (!is_wp_error($resized_img_path)) {
$resized_rel_path = str_replace($upload_dir, '', $resized_img_path);
$img_url = $upload_url . $resized_rel_path;
} else {
return false;
}
}
}
//return the output
if ($single) {
//str return
$image = $img_url;
} else {
//array return
$image = array(
0 => $img_url,
1 => $dst_w,
2 => $dst_h
);
}
return $image;
}