debug_backtrace()

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

产生一条回溯跟踪(backtrace)

说明

debug_backtrace()产生一条 PHP 的回溯跟踪(backtrace)。

参数

截至 5.3.6，这个参数是以下选项的位掩码：

截至 5.4.0，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

返回一个包含众多关联数组的array。以为为有可能返回的元素：

更新日志

范例

Example #1debug_backtrace()范例

执行/tmp/b.php返回的结果类似于以下：

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"
  }
}

参见

• trigger_error() 产生一个用户级别的 error/warning/notice 信息
• debug_print_backtrace() 打印一条回溯。

Here's a function I just wrote for getting a nice and comprehensible call trace. It is probably more resource-intensive than some other alternatives but it is short, understandable, and gives nice output (Exception->getTraceAsString()).

Example output:
  1) /var/www/test/test.php(15): SomeClass->__construct()
  2) /var/www/test/SomeClass.class.php(36): SomeClass->callSomething()

Just a short note on debug_backtrace options for PHP 5.3.6 or newer:
debug_backtrace() - show all options
debug_backtrace(0) - exlude ["object"]
debug_backtrace(1) - same as debug_backtrace()
debug_backtrace(2) - exlude ["object"] AND ["args"]
use this example and try calling debug_backtrace with different options 

If you are using the backtrace function in an error handler, avoid using var_export() on the args, as you will cause fatal errors in some situations, preventing you from seeing your stack trace. Some structures will cause PHP to generate the fatal error "Nesting level too deep - recursive dependency?" This is a design feature of php, not a bug (see http://bugs.php.net/bug.php?id=30471)

Simple function to get a string in form "filename: [class->][function(): ]"

Usage like:

get_caller_info() will return info about the function /class->method that called debug().

When using debug_backtrace() to check if you're being accessed from another caller, please remember to ask debug_backtrace to only go as far as needed in depth and skip taking the entire debug object as return parameter: 

One line of code to print simplest and shortest human readable backtrace:)

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