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PHP debug_print_backtrace

PHP original manual for debug_print_backtrace [ show | php.net ]

debug_print_backtrace

(PHP 5, PHP 7)

debug_print_backtrace — Prints a backtrace

Description

void debug_print_backtrace ([ int $options = 0 [, int $limit = 0 ]] )

debug_print_backtrace() prints a PHP backtrace. It prints the function calls, included/required files and eval()ed stuff.

Parameters

options

As of 5.3.6, this parameter is a bitmask for the following options:

debug_print_backtrace() options
DEBUG_BACKTRACE_IGNORE_ARGS Whether or not to omit the "args" index, and thus all the function/method arguments, to save memory.

limit

As of 5.4.0, this parameter can be used to limit the number of stack frames printed. By default (limit=0) it prints all stack frames.

Return Values

No value is returned.

Changelog

Version Description
5.4.0 Added the optional parameter limit.
5.3.6 Added the optional parameter options.

Examples

Example #1 debug_print_backtrace() example

<?php
// include.php file

function a() {
    b();
}

function b() {
    c();
}

function c(){
    debug_print_backtrace();
}

a();

?>
<?php
// test.php file
// this is the file you should run

include 'include.php';
?>

The above example will output something similar to:

#0  c() called at [/tmp/include.php:10]
#1  b() called at [/tmp/include.php:6]
#2  a() called at [/tmp/include.php:17]
#3  include(/tmp/include.php) called at [/tmp/test.php:3]

See Also