Exception::getTrace

(PHP 5, PHP 7, PHP 8)

Exception::getTraceGets the stack trace

Descrierea

final public Exception::getTrace ( ) : array

Returns the Exception stack trace.

Parametri

Această funcție nu are parametri.

Valorile întoarse

Returns the Exception stack trace as an array.

Exemple

Example #1 Exception::getTrace() example

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

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

Exemplul de mai sus va afișa ceva similar cu:

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

A se vedea și

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User Contributed Notes 5 notes

up
28
sam at notmyrealemail dot org
12 years ago
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'.
up
8
ronald at ronalddiaz dot net
4 years ago
If you are wanting to see the args within a stack trace on PHP 7.4, note that there is now a zend flag in the php.ini file that is default set to Off.

zend.exception_ignore_args = Off

Set this flag to On and it will show the args again.

zend.exception_ignore_args = On

https://www.php.net/manual/en/ini.core.php#ini.zend.exception-ignore-args
up
3
knivey
11 years ago
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) {
    }
  }
}
up
4
andreas at cap-systems dot com
14 years ago
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();
up
0
an43 dot bal at gmail dot com
4 years ago
As of PHP 7.4 return values of Exception::getTrace() (and Error::getTrace()) no longer contains "args" keys like debug_backtrace() with default options.

So, return value since 7.4 is like debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS).
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