PHP自带调试函数

var_dump:打印变量的相关信息

    $a = array(1, 2, array("a", "b", "c"));
    var_dump($a);

//
array (size=3)
  0 => int 1
  1 => int 2
  2 =>
    array (size=3)
      0 => string 'a' (length=1)
      1 => string 'b' (length=1)
      2 => string 'c' (length=1)

var_export:输出或返回一个变量的字符串表示

    $a = array(1, 2, array("a", "b", "c"));
    var_export($a);

//
array ( 0 => 1, 1 => 2, 2 => array ( 0 => 'a', 1 => 'b', 2 => 'c', ), )

get_included_files:返回被 include 和 require 文件名的 array

var_dump(get_included_files());

//
array (size=2)
  0 => string 'D:\phpStudy\PHPTutorial\WWW\laravel56\public\index.php' (length=54)
  1 => string 'D:\phpStudy\PHPTutorial\WWW\laravel56\vendor\autoload.php' (length=57)

debug_backtrace — 产生一条回溯跟踪

<?php
 // filename: /tmp/a.php

 function  a_test ( $str )
{
    echo  "\nHi:  $str " ;
     var_dump ( debug_backtrace ());
}

 a_test ( 'friend' );
 ?>

<?php
 // filename: /tmp/b.php
 include_once  '/tmp/a.php' ;
 ?> 

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

debug_print_backtrace — 打印一条回溯。

<?php
 // include.php file

 function  a () {
     b ();
}

function  b () {
     c ();
}

function  c (){
     debug_print_backtrace ();
}

 a ();

 ?> 

//
#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]