debug_backtrace
(PHP 4 >= 4.3.0, PHP 5)
debug_backtrace — Generates a backtrace
说明
array debug_backtrace ([ int $options = DEBUG_BACKTRACE_PROVIDE_OBJECT [, int $limit = 0 ]] )debug_backtrace() generates a PHP backtrace.
参数
- options
-
As of 5.3.6, this parameter is a bitmask for the following options:
Before 5.3.6, the only values recognized are TRUE or FALSE, which are the same as setting or not setting the DEBUG_BACKTRACE_PROVIDE_OBJECT option respectively.debug_backtrace() options DEBUG_BACKTRACE_PROVIDE_OBJECT Whether or not to populate the "object" index. DEBUG_BACKTRACE_IGNORE_ARGS Whether or not to omit the "args" index, and thus all the function/method arguments, to save memory. - limit
-
As of 5.4.0, this parameter can be used to limit the number of stack frames returned. By default (limit=0) it returns all stack frames.
返回值
Returns an array of associative arrays. The possible returned elements are as follows:
| 名字 | 类型 | 说明 |
|---|---|---|
| function | string | The current function name. See also __FUNCTION__. |
| line | integer | The current line number. See also __LINE__. |
| file | string | The current file name. See also __FILE__. |
| class | string | The current class name. See also __CLASS__ |
| object | object | The current object. |
| type | string | The current call type. If a method call, "->" is returned. If a static method call, "::" is returned. If a function call, nothing is returned. |
| args | array | If inside a function, this lists the functions arguments. If inside an included file, this lists the included file name(s). |
更新日志
| 版本 | 说明 |
|---|---|
| 5.4.0 | Added the optional parameter limit. |
| 5.3.6 | The parameter provide_object changed to options and additional option DEBUG_BACKTRACE_IGNORE_ARGS is added. |
| 5.2.5 | Added the optional parameter provide_object. |
| 5.1.1 | Added the current object as a possible return element. |
范例
Example #1 debug_backtrace() example
Results similar to the following when executing
/tmp/b.php:
<?php
// filename: /tmp/a.php
function a_test($str)
{
echo "
Hi: $str";
var_dump(debug_backtrace());
}
a_test('friend');
?>
<?php
// filename: /tmp/b.php
include_once '/tmp/a.php';
?>
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"
}
}
参见
- trigger_error() - Generates a user-level error/warning/notice message
- debug_print_backtrace() - Prints a backtrace
