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 ( \(str</span><span style="color: #000000;"> )
{
    </span><span style="color: #0000ff;">echo</span>  "\nHi:  <span style="color: #800080;">\)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]