Debugging information about the Debug_backtrace () function in PHP at the print call

This article mainly introduces about PHP in the Debug_backtrace () function printing call at the debugging information, has a certain reference value, now share to everyone, the need for friends can refer to

Debug_backtrace

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

debug_backtrace- generates a backtracking trace (backtrace)

Description

Array debug_backtrace ([ int $options = debug_backtrace_provide_object [, int $limit = 0]])

Debug_backtrace () generates a trace of PHP (BackTrace).

Parameters

• options

• As of 5.3.6, this parameter is a bitmask of the following options:

  Debug_backtrace () option

  Debug_backtrace_provide_object	Whether to populate the index of "object".
  Debug_backtrace_ignore_args	Whether to ignore the "args" index, including all Function/method parameters, can save memory overhead.

  Before 5.3.6, only the values that can be used are TRUE or are FALSE equal to whether the option is set DEBUG_BACKTRACE_PROVIDE_OBJECT .

• limit

• As of 5.4.0, this parameter can be used to limit the number of return stack frames. The default is ( limit =0), which returns all stack frames.

return value

Returns an array containing a number of associative arrays . Elements that are expected to be returned:

It is possible to return elements from Debug_backtrace ()

name	type	Description
function	String	The current function name, see: __function__.
Line	Integer	The current line number. See also: __line__.
File	String	The current file name. See also: __file__.
Class	String	The name of the current class. See __class__
Object	Object	The current object.
Type	String	The type of the current call. If it is a method, it returns "--". If it is a static method, it returns "::". If it is a function call, it returns NULL.
Args	Array	If in a function, this lists the parameters of the function. If it is in a contained file, the included file name is listed.

Update log

version	Description
5.4.0	Optional parameters have been added limit .
5.3.6	Parameters are changed and optional provide_object options parameters are added DEBUG_BACKTRACE_IGNORE_ARGS .
5.2.5	Optional parameters have been added provide_object .
5.1.1	Added the current object as an element that may be returned.

Example

Example #1 debug_backtrace () example

<?php//filename:/tmp/a.phpfunction a_test ($str) {    echo "\nhi: $str";    Var_dump (Debug_backtrace ());} A_test (' friend ');? ><?php//filename:/tmp/b.phpinclude_once '/tmp/a.php ';? >

The execution returns a result similar to the following:

Hi:friendarray (2) {[0]=>array (4) {    ["file"] and "/tmp/a.php" ["line    "] = Int (ten)    [" function "] = = string (6)" A_test "    [" args "]=>    Array (1) {      [0] = &string (6)" Friend "    }}[1]= >array (4) {    ["file"] + = string (Ten) "/tmp/b.php"    ["line"] = + int (2)    ["args"] = =    Array (1 {      [0] = = string (Ten) "/tmp/a.php"    }    ["function"] = = string (+) "Include_once"}  }

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