wp_debug_backtrace_summary() – Function

Returns a comma-separated string or array of functions that have been called to get to the current point in code.

Description

Parameters

$ignore_classstringoptional: A class to ignore all function calls within – useful when you want to just give info about the callee.
Default:null
$skip_framesintoptional: A number of stack frames to skip – useful for unwinding back to the source of the issue. Default 0.
$prettybooloptional: Whether you want a comma separated string instead of the raw array returned.
Default:true

Return

string|array Either a string containing a reversed comma separated trace or an array of individual calls.

Source

function wp_debug_backtrace_summary( $ignore_class = null, $skip_frames = 0, $pretty = true ) {
	static $truncate_paths;

	$trace       = debug_backtrace( false );
	$caller      = array();
	$check_class = ! is_null( $ignore_class );
	++$skip_frames; // Skip this function.

	if ( ! isset( $truncate_paths ) ) {
		$truncate_paths = array(
			wp_normalize_path( WP_CONTENT_DIR ),
			wp_normalize_path( ABSPATH ),
		);
	}

	foreach ( $trace as $call ) {
		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']}";
		} else {
			if ( in_array( $call['function'], array( 'do_action', 'apply_filters', 'do_action_ref_array', 'apply_filters_ref_array' ), true ) ) {
				$caller[] = "{$call['function']}('{$call['args'][0]}')";
			} elseif ( in_array( $call['function'], array( 'include', 'include_once', 'require', 'require_once' ), true ) ) {
				$filename = isset( $call['args'][0] ) ? $call['args'][0] : '';
				$caller[] = $call['function'] . "('" . str_replace( $truncate_paths, '', wp_normalize_path( $filename ) ) . "')";
			} else {
				$caller[] = $call['function'];
			}
		}
	}
	if ( $pretty ) {
		return implode( ', ', array_reverse( $caller ) );
	} else {
		return $caller;
	}
}

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Uses	Description
wp_normalize_path()`wp-includes/functions.php`	Normalizes a filesystem path.

Used by	Description
wpdb::get_caller()`wp-includes/class-wpdb.php`	Retrieves a comma-separated list of the names of the functions that called wpdb.

Changelog

Version	Description
3.4.0	Introduced.

User Contributed Notes

Skip to note 2 content

Ulrich 7 years ago

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```
error_log( wp_debug_backtrace_summary() ); 
```
Source
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wp_debug_backtrace_summary( string $ignore_class = null, int $skip_frames, bool $pretty = true ): string|array

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