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 ]] )

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

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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