debug.logから、WordPressのDeprecated: Functionを消す

WordPress3.3から3.4にかけて大量の非推奨関数が発生しましたが、表示に直接影響を与える関数が多く、旧バージョンとの互換性を維持するために、テーマなどでは、あえて非推奨関数を含んで使っている状況にあります。

debug.logには、必ず非推奨関数のエラーが記述されるので、実際のエラーを特定する妨げになる事もあると思います。

以下のコードを記述する事で、debug.logへワードプレスの非推奨関数のエラーを書き出さなくする事が出来ます。

Add themes/functions.php

add_filter( 'deprecated_function_trigger_error', '__return_false' );
add_filter( 'deprecated_file_trigger_error', '__return_false' );

仕組み

wp-includes/functions.php

/**
 * Marks a function as deprecated and informs when it has been used.
 *
 * There is a hook deprecated_function_run that will be called that can be used
 * to get the backtrace up to what file and function called the deprecated
 * function.
 *
 * The current behavior is to trigger a user error if WP_DEBUG is true.
 *
 * This function is to be used in every function that is deprecated.
 *
 * @package WordPress
 * @subpackage Debug
 * @since 2.5.0
 * @access private
 *
 * @uses do_action() Calls 'deprecated_function_run' and passes the function name, what to use instead,
 * and the version the function was deprecated in.
 * @uses apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do
 * trigger or false to not trigger error.
 *
 * @param string $function The function that was called
 * @param string $version The version of WordPress that deprecated the function
 * @param string $replacement Optional. The function that should have been called
 */
function _deprecated_function( $function, $version, $replacement= null ) {

	do_action( 'deprecated_function_run', $function, $replacement, $version );

	// Allow plugin to filter the output error trigger
	if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) {
		if ( ! is_null($replacement) )
			trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) );
		else
			trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
	}
}
/**
 * Marks a file as deprecated and informs when it has been used.
 *
 * There is a hook deprecated_file_included that will be called that can be used
 * to get the backtrace up to what file and function included the deprecated
 * file.
 *
 * The current behavior is to trigger a user error if WP_DEBUG is true.
 *
 * This function is to be used in every file that is deprecated.
 *
 * @package WordPress
 * @subpackage Debug
 * @since 2.5.0
 * @access private
 *
 * @uses do_action() Calls 'deprecated_file_included' and passes the file name, what to use instead,
 * the version in which the file was deprecated, and any message regarding the change.
 * @uses apply_filters() Calls 'deprecated_file_trigger_error' and expects boolean value of true to do
 * trigger or false to not trigger error.
 *
 * @param string $file The file that was included
 * @param string $version The version of WordPress that deprecated the file
 * @param string $replacement Optional. The file that should have been included based on ABSPATH
 * @param string $message Optional. A message regarding the change
 */
function _deprecated_file( $file, $version, $replacement= null, $message= '' ) {

	do_action( 'deprecated_file_included', $file, $replacement, $version, $message );

	// Allow plugin to filter the output error trigger
	if ( WP_DEBUG && apply_filters( 'deprecated_file_trigger_error', true ) ) {
		$message= empty( $message ) ? '' : ' ' . $message;
		if ( ! is_null( $replacement ) )
			trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $file, $version, $replacement ) . $message );
		else
			trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $file, $version ) . $message );
	}
}

To prevent the notices from displaying for functions, the ‘deprecated_function_trigger_error’ filter hook should return false. To prevent notices from displaying for files, the ‘deprecated_file_trigger_error’ filter hook should return false.

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