custom-backtrace.php

/**
 * Clone of wp_debug_backtrace_summary()
 *
 * Return a comma-separated string of functions that have been called to get
 * to the current point in code.
 *
 * @see https://core.trac.wordpress.org/ticket/19589
 *
 * @param string $ignore_class Optional. A class to ignore all function calls within - useful
 *                             when you want to just give info about the callee. Default null.
 * @param int    $skip_frames  Optional. A number of stack frames to skip - useful for unwinding
 *                             back to the source of the issue. Default 0.
 * @param bool   $pretty       Optional. Whether or not you want a comma separated string or raw
 *                             array returned. Default true.
 * @return string|array Either a string containing a reversed comma separated trace or an array
 *                      of individual calls.
 */
function cmw_wp_debug_backtrace_summary( $ignore_class = null, $skip_frames = 0, $pretty = true ) {
	if ( version_compare( PHP_VERSION, '5.2.5', '>=' ) )
		$trace = debug_backtrace( false );
	else
		$trace = debug_backtrace();

	$caller = array();
	$check_class = ! is_null( $ignore_class );
	$skip_frames++; // skip this function

	foreach ( $trace as $call ) {
		$line = (isset($call['line']) ? ' line:' . $call['line'] : ' <unknown line>');
		if ( $skip_frames > 0 ) {
			$skip_frames--;
		} elseif ( isset( $call['class'] ) ) {
			if ( $check_class && $ignore_class == $call['class'] )
				continue; // Filter out calls

			$caller[] = "{$call['class']}{$call['type']}{$call['function']}" . $line;
		} else {
			if ( in_array( $call['function'], array( 'do_action', 'apply_filters' ) ) ) {
				$caller[] = "{$call['function']}('{$call['args'][0]}')" . $line;
			} elseif ( in_array( $call['function'], array( 'include', 'include_once', 'require', 'require_once' ) ) ) {
				$caller[] = $call['function'] . "('" . str_replace( array( WP_CONTENT_DIR, ABSPATH ) , '', $call['args'][0] ) . "')" . $line;
			} else {
				$caller[] = $call['function'] . $line;
			}
		}
	}
	if ( $pretty )
		return join( ', ', array_reverse( $caller ) );
	else
		return $caller;
}