The debug_print_backtrace Function

The debug_print_backtrace function outputs information about the current call stack - the sequence of functions that led to the current point of execution. The function does not return a value but outputs the result immediately. The first parameter can specify flags to change the output format, the second - a limit on the number of output levels.

Syntax

debug_print_backtrace(int $options = 0, int $limit = 0): void

Example

A simple example of calling the function:

<?php
	function a() {
		b();
	}
	function b() {
		debug_print_backtrace();
	}
	a();
?>

Code execution result:

#0  b() called at [test.php:4]
#1  a() called at [test.php:8]

Example

Using the limit parameter to limit the output:

<?php
	function x() {
		y();
	}
	function y() {
		z();
	}
	function z() {
		debug_print_backtrace(0, 2);
	}
	x();
?>

Code execution result:

#0  z() called at [test.php:9]
#1  y() called at [test.php:6]

Example

Using options to change the output format:

<?php
function test1() {
	test2();
}
function test2() {
	debug_print_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
}
test1();
?>

Code execution result (without function arguments):

#0  test2() called at [test.php:4]
#1  test1() called at [test.php:8]

The debug_print_backtrace Function

Syntax

Example

Example

Example

See Also