gistfile1.txt

<?php


final class MfieldsDumpHook {

	/**
	 * A list of hooks to dump
	 */
	private static $hooks = null;

	/**
	 * Create an instance.
	 *
	 * Add the hook name to the static list.
	 * Register the shutdown callback when the
	 * first instance is created.
	 *
	 * @param string $hook_name The name of a hook. Required.
	 *
	 * @uses MfieldsDumpHook::$hooks
	 * @uses MfieldsDumpHook::dump_all()
	 */
	public function __construct( $hook_name ) {
		if ( is_null( self::$hooks ) )
			self::$hooks = array();

		self::$hooks[] = $hook_name;

		if ( ! has_filter( 'shutdown', array( __class__, 'dump_all' ) ) )
			add_action( 'shutdown', array( __class__, 'dump_all' ) );
	}

	/**
	 * Dump all hooks and and assigned functions.
	 *
	 * Ensure that duplicate and empty hook names
	 * do not get dumped.
	 *
	 * @uses MfieldsDumpHook::$hooks
	 * @uses MfieldsDumpHook::dump()
	 */
	public static function dump_all() {
		if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
			return;

		$hooks = array_unique( self::$hooks );
		$hooks = array_filter( $hooks );

		if ( empty( $hooks ) )
			return;

		foreach ( $hooks as $hook ) {
			self::dump( $hook );
		}
	}

	/**
	 * Print a table containg the information for a single hook.
	 *
	 * @param string $hook Name of an action or filter.
	 *
	 * @uses MfieldsDumpHook::css()
	 */
	public static function dump( $hook ) {
		global $wp_filter;

		if ( ! isset( $wp_filter[$hook] ) ) {
			print '<p style="color:red;">No functions are attached to <code>' . esc_html( $hook ) . '</code>.</p>';
			return;
		}

		self::css();

		ksort( $wp_filter[$hook] );

		echo '<div id="mfields-hook-dump">';
		echo '<table>';
		echo '<caption><code>' . esc_html( $hook ) . '</code></caption>';
		echo '<thead><tr><th class="priority">Priority</th><th>Hooked Functions</th></tr></thead>';
		echo '<tbody>';

		foreach ( (array) $wp_filter[$hook] as $priority => $functions ) {
			echo "\n" . '<tr>';
			echo "\n\t" . '<th class="priority">' . esc_html( $priority ) . '</th>';
			echo "\n\t" . '<td>';
			echo "\n\t" . '<ul>';
			foreach ( $functions as $slug => $function ) {
				$function = wp_parse_args( $function, array(
					'function'      => '',
					'accepted_args' => '',
				) );

				$function_name = '';
				if ( is_array( $function['function'] ) ) {
					if ( is_string( $function['function'][0] ) )
						$function_name = $function['function'][0] . '::' . $function['function'][1];
					else if ( is_object( $function['function'][0] ) )
						$function_name = get_class( $function['function'][0] ) . '::'. $function['function'][1];
				}
				else if ( is_string( $function['function'] ) ) {
					$function_name = $function['function'];
				}

				echo "\n\t" . '<li><code>' . esc_html( $function_name . '()' ) . '</code></li>';
			}
			echo "\n\t" . '</ul>';
			echo "\n\t" . '</td>';
			echo "\n\n" . '</tr>';
		}

		echo '</tbody>';
		echo '</table>';
		echo '</div>';
	}

	/**
	 * Styles for the table rendered by MfieldsDumpHook::dump()
	 *
	 * This style block will be printed inline. This is not
	 * the best practice. Since this class is not intended
	 * to be used in production, I have made an exception.
	 */
	function css() {
		echo '
			<style>
			#mfields-hook-dump {
				padding: 0 1em;
				font-family: Arial, sans-serif;
				font-size: 14px;
				max-width: 600px;
				min-width: 500px;
				margin: 2em auto;
			}
			#mfields-hook-dump table {
				color: #555;
				border: 1px solid #bbb !important;
				border-collapse: collapse;
				box-shadow: 2px 2px 10px rgba( 0, 0, 0, .3 );
			}
			#mfields-hook-dump code {
				font-size: 14px;
			}
			#mfields-hook-dump code {
				color: #333;
				background: transparent;
			}
			#mfields-hook-dump ul {
				margin: 0;
				padding: 0 0 0 1em;
				list-style-type: square;
				list-style-position: inside;
			}
			#mfields-hook-dump table caption {
				background: #eee;
				border: 1px solid #ccc;
				border-bottom: none;
				border-top-right-radius: 5px;
				border-top-left-radius: 5px;
				font-size: 14px;
				padding: .4em .2em;
				text-align: center;
				min-width: 3em;
				max-width: 10em;
				width: auto;
			}
			#mfields-hook-dump table caption code {
				font-size: 14px;
			}
			#mfields-hook-dump table th,
			#mfields-hook-dump table td {
				border: 1px solid #bbb;
				padding: .5em;
			}
			#mfields-hook-dump th.priority {
				text-align: center !important;
				width: 5em;
			}
			#mfields-hook-dump thead th {
				background: #7a7a7a;
				background-image:-moz-linear-gradient( center bottom , #6D6D6D, #808080 );
				color: #fff;
				padding: .5em 1.5em;
			}
			#mfields-hook-dump tbody th {
				background: #eaf2fa;
				color: #7a7a7a;
				text-align: center;
				vertical-align: top;
			}
			#mfields-hook-dump tbody td,
			#mfields-hook-dump tbody td code {
				background: #fff;
				color: #555;
			}
			</style>
		';
	}
}

Called like this:

/**
 * Dump all functions assigned to a hook.
 *
 * You may specify any number of hooks to dump by
 * passing their names as parameters.
 *
 * One hook ...... Mfields::dump_hook( 'the_content' );
 * Two hooks ..... Mfields::dump_hook( 'the_content', 'the_excerpt' );
 *
 * If no parameters are passed, an E_USER_NOTICE
 * will be triggered.
 *
 * @uses MfieldsDumpHook
 * @uses Mfields::queue_error()
 */
public static function dump_hook() {
    $args = func_get_args();

    if ( empty( $args ) ) {
        self::queue_error( 'No parameters were passed to ' . __method__ . '()' );
        return;
    }

    foreach( $args as $hook_name ) {
        $obj = new MfieldsDumpHook( $hook_name );
    }
}