(PHP 5 >= 5.1.0)
Exception::getTrace — 获取异常追踪信息
返回异常追踪信息。
此函数没有参数。
返回包含异常追踪信息的数组（array）。
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) {
}
}
}
knivey (2013-04-18 14:53:19)
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 (2012-02-17 15:26:48)
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 (2010-06-09 12:55:28)
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();