php教程

Exception::getTrace

(PHP 5, PHP 7)

Exception::getTrace — 获取异常追踪信息

说明

final public Exception::getTrace ( void ) : array

返回异常追踪信息。

参数

此函数没有参数。

返回值

返回包含异常追踪信息的数组（array）。

范例

Example #1 Exception::getTrace()示例

<?php
function test() {
 throw new Exception;
}

try {
 test();
} catch(Exception $e) {
 var_dump($e->getTrace());
}
?>

以上例程的输出类似于：

array(1) {
  [0]=>
  array(4) {
    ["file"]=>
    string(22) "/home/bjori/tmp/ex.php"
    ["line"]=>
    int(7)
    ["function"]=>
    string(4) "test"
    ["args"]=>
    array(0) {
    }
  }
}

参见

  • Throwable::getTrace()

User Contributed Notes

knivey 18-Apr-2013 02:53
The order of the trace starts at the source of the exception and does not include main.
So for example:

<?php
function Bar() {
 throw new Exception;
}

function Foo() {
 Bar();
}

try {
 Foo();
} catch(Exception $e) {
 var_dump($e->getTrace());
}
?>

Will output:

array(2) {
  [0]=>
  array(4) {
    ["file"]=>
    string(21) "/.../test.php"
    ["line"]=>
    int(8)
    ["function"]=>
    string(3) "Bar"
    ["args"]=>
    array(0) {
    }
  }
  [1]=>
  array(4) {
    ["file"]=>
    string(21) "/.../test.php"
    ["line"]=>
    int(12)
    ["function"]=>
    string(3) "Foo"
    ["args"]=>
    array(0) {
    }
  }
}
sam at notmyrealemail dot org 17-Feb-2012 03:26
Two important points about this function which are not documented:

1) The trace does not include the file / line at which the exception is thrown; that entry is only recorded in the top-level getFile/Line methods.

2) Elements are returned in 'closest-first' order, e.g. if you have a script x which calls function y which calls function z which throws an exception, then the first trace element will be 'Y' and the second will be 'X'.
andreas at cap-systems dot com 09-Jun-2010 12:55
When calling getTrace(), there is also the name of the class in returned array:

<?php
  class Test {

    function __construct() {

      throw new Exception('FATAL ERROR: bla bla...');

    }

  }

  try {

    $obj = new Test();

  } catch(Exception $e) {

    var_dump($e->getTrace());

  }
?>

Will show something like:

array(1) {
  [0]=>  array(6) {
               ["file"]=>  string(54) "/....../test.php"
               ["line"]=>  int(37)
               ["function"]=>  string(11) "__construct"
               ["class"]=>  string(4) "Test"
               ["type"]=>  string(2) "->"
               ["args"]=>  array(0) { }
             }
}

You can use this function to format a exception:

<?php
  function MakePrettyException(Exception $e) {
    $trace = $e->getTrace();

    $result = 'Exception: "';
    $result .= $e->getMessage();
    $result .= '" @ ';
    if($trace[0]['class'] != '') {
      $result .= $trace[0]['class'];
      $result .= '->';
    }
    $result .= $trace[0]['function'];
    $result .= '();<br />';

    return $result;
  }

  //Example:
  try {

    $obj = new Test();

  } catch(Exception $e) {

    echo MakePrettyException($e);

  }

?>

Result:

Exception: "FATAL ERROR: bla bla..." @ Test->__construct();

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