超越PHP - Exceed PHP: debug_backtrace

Description

array debug_backtrace ( void )

debug_backtrace() generates a PHP backtrace and returns this information as an associative array. The possible returned elements are listed in the following table:

表格 1. Possible returned elements from debug_backtrace()

Name	Type	Description
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__
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).

The following is a simple example.

例子 1. debug_backtrace() example

<?php // filename: a.php function a_test($str) { echo "\nHi: $str"; var_dump(debug_backtrace()); } a_test('friend'); ?> <?php // filename: b.php include_once '/tmp/a.php'; ?>
Results when executing /tmp/b.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" } }

add a note User Contributed Notes
debug_backtrace

jlim#natsoft.com.my
13-Mar-2003 09:51

Pretty print the backtrace(). Functions are indented based on call value,
and file is linked using file:// for convenience. 

Enjoy, John
Lim

	function adodb_backtrace($print=true)
	{
		$s =
'';
		if (PHPVERSION() >= 4.3) {
		
			$MAXSTRLEN =
64;
		
			$s = '<pre align=left>';
			$traceArr =
debug_backtrace();
			array_shift($traceArr);
			$tabs =
sizeof($traceArr)-1;
			foreach ($traceArr as $arr) {
				for ($i=0;
$i < $tabs; $i++) $s .= ' &nbsp; ';
				$tabs -= 1;
				$s .=
'<font face="Courier New,Courier">';
				if
(isset($arr['class'])) $s .= $arr['class'].'.';
				foreach($arr['args']
as $v) {
					if (is_null($v)) $args[] = 'null';
					else if
(is_array($v)) $args[] = 'Array['.sizeof($v).']';
					else if
(is_object($v)) $args[] = 'Object:'.get_class($v);
					else if
(is_bool($v)) $args[] = $v ? 'true' : 'false';
					else { 
						$v
= (string) @$v;
						$str =
htmlspecialchars(substr($v,0,$MAXSTRLEN));
						if (strlen($v) >
$MAXSTRLEN) $str .= '...';
						$args[] =
$str;
					}
				}
				
				$s .=
$arr['function'].'('.implode(', ',$args).')';
				$s .=
sprintf("</font><font color=#808080 size=-1> # line
%4d,".
  " file: <a
href=\"file:/%s\">%s</a></font>",
 
$arr['line'],$arr['file'],$arr['file']);
				$s .=
"\n";
			}	
			$s .= '</pre>';
			if ($print)
print $s;
		}
		return $s;
	}

add a note