debug_print_backtrace

(PHP 5, PHP 7)

debug_print_backtrace 打印一条回溯。

说明

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

debug_print_backtrace() 打印了一条 PHP 回溯。它打印了函数调用、被 included/required 的文件和 eval() 的代码。

参数

options

从 5.3.6 开始,这个参数是以下选项的位掩码:

debug_print_backtrace() 选项
DEBUG_BACKTRACE_IGNORE_ARGS 是否忽略 "args" 的索引,包括所有的 function/method 的参数,能够节省内存开销。

limit

从 5.4.0 开始,这个参数能够用于限制返回堆栈帧的数量。 默认为 (limit=0) ,返回所有的堆栈帧。

返回值

没有返回值。

更新日志

版本 说明
5.4.0 添加了可选的参数 limit
5.3.6 添加了可选的参数 options

范例

Example #1 debug_print_backtrace() 范例

<?php
// include.php file

function a() {
    
b();
}

function 
b() {
    
c();
}

function 
c(){
    
debug_print_backtrace();
}

a();

?>
<?php
// 文件 test.php
// 这是你应该运行的文件

include 'include.php';
?>

以上例程的输出类似于:

#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]

参见

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User Contributed Notes 7 notes

up
36
bishop
8 years ago
Another way to manipulate and print a backtrace, without using output buffering:

<?php
// print backtrace, getting rid of repeated absolute path on each file
$e = new Exception();
print_r(str_replace('/path/to/code/', '', $e->getTraceAsString()));
?>
up
13
dany dot dylan at gmail dot com
9 years ago
I like the output of debug_print_backtrace() but I sometimes want it as a string.

bortuzar's solution to use output buffering is great, but I'd like to factorize that into a function.  Doing that however always results in whatever function name I use appearing at the top of the stack which is redundant.

Below is my noddy (simple) solution.  If you don't care for renumbering the call stack, omit the second preg_replace().

<?php
   
function debug_string_backtrace() {
       
ob_start();
       
debug_print_backtrace();
       
$trace = ob_get_contents();
       
ob_end_clean();

       
// Remove first item from backtrace as it's this function which
        // is redundant.
       
$trace = preg_replace ('/^#0\s+' . __FUNCTION__ . "[^\n]*\n/", '', $trace, 1);

       
// Renumber backtrace items.
       
$trace = preg_replace ('/^#(\d+)/me', '\'#\' . ($1 - 1)', $trace);

        return
$trace;
    }
?>
up
0
aidan at php dot net
12 years ago
This functionality is now implemented in the PEAR package PHP_Compat.

More information about using this function without upgrading your version of PHP can be found on the below link:

http://pear.php.net/package/PHP_Compat
up
-2
AB
2 years ago
This code will give you a simple horizontal stack trace to assist debugging:

<?php

class A {
    public function
testA() {
        echo
"<LI>Class A.testA ----??";
        echo
"<LI>".$this->whoDidThat();
    }
    public function
whoDidThat() {
       
$who=debug_backtrace();
       
$result="";
       
$count = 0;
       
$last=count($who);
        foreach(
$who as $k=>$v) {
            if (
$count++ > 0) {
               
$x="";
                if (
$count>2) {
                   
$x=">";
                }
               
$result="[line".$who[$k]['line']."]".$who[$k]['class'].".".$who[$k]['function'].$x.$result;
            }
        }
        return
$result;
    }
}
class
B extends A {
    public function
testB() {
        echo
"<LI>Class B.testB";
        echo
"<LI>".$this->whoDidThat();
    }
    public function
testA() {
        echo
"<LI>Class testB.testA  ---- Y";
        echo
"<LI>".$this->whoDidThat();
    }
}
class
C {
    public function
test() {
        echo
"<HR>";
       
$b=new B();
        echo
"<HR>Class C calling B.testA";
       
$b->testA();
    }
}

$c=new C();
$c->test();
echo
debug_print_backtrace();
?>

When run you get

Class C calling B.testA
*Class testB.testA ---- Y
*[line45]C.test>[line40]B.testA
up
-9
bortuzar at gmail dot com
2 years ago
If yos wantoou gat thektrace into y.variab or DB,ut Iugg.tentoodoat thnofollering:

<?php
   ">ob_start
(;
       
debug_print_backtrace(p
   
$trace = ob_get_contents(p
   
ob_end_clean(>}

= (;
           =
($trace();
(?>
up
736
8 years ago
$tras_to_ign>Morargocume)at.


This solutioi as niraceywkar fountoou gat thf debug_print_backtrace(e informatioi If y'Moral"breyut using>ob_stace(e ng youf PHP-modg:

<?php
function debug_print_backtrace($tras_to_ign>More = 1   >($trasre = debug_backtrace();
   n
$unt array">();
    foreach(
$trasre as         ifs &lp>($tras_to_ign>More ) {
           t_coinue(;
       />}

       
= '' ca>1'class') {
           
= ca>1'class'. ca>1;
            ifs
( ca>1) {
           />    foreaif (
ca>1) {
                   
;
                }
            }
       ;        }

       
= .stpade $tras_to_ign>Mo/"((.. ca>1'function'].., ca>1
       ">.
. ca>1iline'].. ca>1'line'].   />}

    return
) {
    ifs
() {
       
(array) (;
       
array">();
   />    foreach(
as eece ) {
            ifs
ees', (0) {
               
eece = ''/Privulaty.variab e fou {
           
.ees'.       />}

       
= . ., .''?>
up
8-9
2 years ago
bortuz:ou a simpour versi, w/ong output buffering:

<?php
= (;
   =
(= debug_backtrace") >();
(?>
/ 9