About the debug_backtrace() function in PHP that prints debugging information at the call location

This article mainly introduces the debugging information about the debug_backtrace() function print call in PHP. It has a certain reference value. Now I share it with you. Friends in need can refer to it

debug_backtrace

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

debug_backtrace — Generate a backtrace

Description

##array debug_backtrace ([ int $options = DEBUG_BACKTRACE_PROVIDE_OBJECT [, int $limit = 0 ]] )

#debug_backtrace () Generates a PHP backtrace.

Parameters

• options

As of 5.3.6, this parameter is the following Bit mask of options:

• debug_backtrace() optionDEBUG_BACKTRACE_PROVIDE_OBJECTDEBUG_BACKTRACE_IGNORE_ARGSBefore 5.3.6, the only values ​​that could be used were

  Whether to fill in "object" index.
  Whether to ignore the index of "args", including all function/method parameters, can save memory overhead.

  TRUE

  or FALSE, which were respectively equal to whether to set DEBUG_BACKTRACE_PROVIDE_OBJECT option.

• limit

As of 5.4.0, this parameter can be used to limit the number of stack frames returned. The default is (
• limit

  =0), which returns all stack frames.

Return value

Returns an

array containing many associative arrays. Elements that may be returned:

Elements that may be returned from debug_backtrace()NamefunctionstringlineintegerfilestringclassstringobjectobjecttypestringargsarrayUpdate Log

Type	Description
	The current function name, see: __FUNCTION__.
	The current line number. See: __LINE__.
	The current file name. See: __FILE__.
	The name of the current class. See __CLASS__
	the current object.
	The type of the current call. If it is a method, "->" will be returned. If it is a static method, "::" will be returned. If it is a function call, returns null.
	If inside a function, this will list the parameters of the function. If it is in an included file, the included file name will be listed.

Version5.4.0limit5.3.6provide_object5.2.5Added optional parameter . 5.1.1Added the current

Example

Example #1 debug_backtrace() Example

<?php
// filename: /tmp/a.php
function a_test($str)
{
    echo "\nHi: $str";
    var_dump(debug_backtrace());
}
a_test(&#39;friend&#39;);
?>
<?php
// filename: /tmp/b.php
include_once &#39;/tmp/a.php&#39;;
?>

Execution The result returned is similar to the following:

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"
  }
}

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Related recommendations:

How to use var_export in PHP

About a problem encountered with PHP conditional operators and Solution

Description
Added optional parameter	.
The parameter	was changed to options, and the optional parameter DEBUG_BACKTRACE_IGNORE_ARGS# was added ##.
provide_object
object as a possible returned element.

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