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Fixes 'preview changes' in WordPress so that post meta is not pushed live but any modifications are available to the preview.
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| <?php | |
| // post meta for previews | |
| class wp_preview_meta { | |
| private $doing_preview = false; | |
| public function __construct() { | |
| add_filter( 'add_post_metadata', array( $this, 'add' ), 10, 5 ); | |
| add_filter( 'update_post_metadata', array( $this, 'update' ), 10, 5 ); | |
| add_filter( 'delete_post_metadata', array( $this, 'delete' ), 10, 5 ); | |
| add_filter( 'get_post_metadata', array( $this, 'get' ), 10, 4 ); | |
| } | |
| public function is_preview() { | |
| if( is_admin() ) | |
| return !$this->doing_preview && isset($_POST[ 'wp-preview' ]) && $_POST['wp-preview'] == 'dopreview'; | |
| // And on the front end: (props @yrosen) | |
| return ! $this->doing_preview && isset( $_GET[ 'preview' ] ) && $_GET[ 'preview' ] == 'true'; | |
| } | |
| private function mod_key( $key ) { | |
| if ( strlen( $key ) > 50 ) | |
| $key = md5( $key ); | |
| return "_preview__{$key}"; | |
| } | |
| public function __call( $method, $args ) { | |
| if ( ! $this->is_preview() || ! function_exists( "{$method}_metadata" ) ) | |
| return $args[0]; | |
| // replace $check with $meta_type | |
| $args[ 0 ] = 'post'; | |
| // modify key | |
| $args[ 2 ] = $this->mod_key( $args[ 2 ] ); | |
| // call original function but make sure we don't get stuck in a loop | |
| $this->doing_preview = true; | |
| $result = call_user_func_array( "{$method}_metadata", $args ); | |
| $this->doing_preview = false; | |
| return $result; | |
| } | |
| } | |
| $wp_preview_meta = new wp_preview_meta(); |
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This is great! Fixes a problem that's been driving me crazy.
One suggestion...is_preview() doesn't always work right. I fixed it with this: