PHP debug_print_backtrace() Function

The PHP debug_print_backtrace() function is used to print a PHP backtrace. This function displays data from the code that led up to the debug_print_backtrace() function.

Syntax

debug_print_backtrace(options, limit)

Parameters

`options`	`Optional.` Specify this parameter as a bitmask for the following options: DEBUG_BACKTRACE_IGNORE_ARGS - Whether or not to omit the "args" index, and thus all the function/method arguments, to save memory.
`limit`	`Optional.` This parameter can be used to limit the number of stack frames printed. By default (limit=0) it prints all stack frames.

Return Value

No value is returned.

Example: debug_print_backtrace() example

The example below shows the usage of debug_print_backtrace() function.

<?php
function test_a($x, $y){
  echo "\$x + \$y = ".($x + $y)."\n";
  debug_print_backtrace();
}

test_a(10, 20);
?>

The output of the above code will be:

$x + $y = 30
#0  test_a(10, 20) called at [Main.php:7]

Example: debug_print_backtrace() example

Consider one more example on debug_print_backtrace() function.

<?php
function test_a($str){
  test_b($str);
}

function test_b($str){
  test_c($str);
}

function test_c($str){
  echo "Hi $str \n";
  debug_print_backtrace();
}

test_a('friend');
?>

The output of the above code will be:

Hi friend 
#0  test_c(friend) called at [Main.php:7]
#1  test_b(friend) called at [Main.php:3]
#2  test_a(friend) called at [Main.php:15]

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