How do I find out which file includes the other in PHP?

Question

I would like to know in PHP how do I find out which is the parent file, in an inclusion, through the child file.

Example:

• avo.php
• pai.php
• php son.

In the archive avo.php I have:

include_once 'pai.php';

And in the archive pai.php I have:

#pai.php
include_once 'filho.php';

• Through the archive filho.php, how can I discover that it is included by pai.php?
• How can I find out, atavés de filho.php, that pai.php is included by avo.php?

Answer 1

Use debug_backtrace() or debug_print_backtrace, it can detect both include, require, include_once, require_once, how much scope of functions and classes.

Using debug_backtrace():

• Filing cabinet /foo/a. php:

  <?php
  function a_test($str)
  {
      echo "\nOlá: $str";
      var_dump(debug_backtrace());
  }
  
  a_test('amigo');
  ?>
  

• Filing cabinet /foo/b. php:

  <?php
  include_once '/foo/a.php';
  ?>
  

• Upshot:

  Olá: amigo
  array(2) {
  [0]=>
  array(4) {
      ["file"] => string(10) "/foo/a.php"
      ["line"] => int(10)
      ["function"] => string(6) "a_test"
      ["args"]=>
      array(1) {
        [0] => &string(6) "amigo"
      }
  }
  [1]=>
  array(4) {
      ["file"] => string(10) "/foo/b.php"
      ["line"] => int(2)
      ["args"] =>
      array(1) {
        [0] => string(10) "/foo/a.php"
      }
      ["function"] => string(12) "include_once"
    }
  }
  

Using debug_print_backtrace:

• Filing cabinet foo.php:

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

• Filing cabinet index php.:

  <?php
  include 'foo.php';
  ?>
  

• Upshot:

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