php：确定从何处调用函数

有没有一种方法可以找出PHP函式的来源？例：

function epic()
{
  fail();
}

function fail()
{
  //at this point, how do i know, that epic() has called this function?
}

您可以使用debug_backtrace()。

例：

<?php

function epic( $a, $b )
{
    fail( $a . ' ' . $b );
}

function fail( $string )
{
    $backtrace = debug_backtrace();

    print_r( $backtrace );
}

epic( 'Hello', 'World' );

输出：

Array
(
    [0] => Array
        (
            [file] => /Users/romac/Desktop/test.php
            [line] => 5
            [function] => fail
            [args] => Array
                (
                    [0] => Hello World
                )

        )

    [1] => Array
        (
            [file] => /Users/romac/Desktop/test.php
            [line] => 15
            [function] => epic
            [args] => Array
                (
                    [0] => Hello
                    [1] => World
                )

        )

)

用途debug_backtrace()：

function fail()
{
    $backtrace = debug_backtrace();

    // Here, $backtrace[0] points to fail(), so we'll look in $backtrace[1] instead
    if (isset($backtrace[1]['function']) && $backtrace[1]['function'] == 'epic')
    {
        // Called by epic()...
    }
}

我发现的最快，最简单的解决方案

public function func() { //function whose call file you want to find
    $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1);
}

$trace: Array
(
    [0] => Array
        (
            [file] => C:\wamp\www\index.php
            [line] => 56
            [function] => func
            [class] => (func Class namespace)
            [type] => ->
        )

)

我在联想笔记本电脑上测试了速度：Intel Pentiom CPU N3530 2.16GHz，RAM 8GB

global $times;
$start = microtime(true);
$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1);
$times[] = microtime(true) - $start;

结果：

count($times):  97
min:    2.6941299438477E-5
max:   10.68115234375E-5
avg:    3.3095939872191E-5
median: 3.0517578125E-5
sum:  321.03061676025E-5

the same results with notation without E-5
count($times):  97
min:    0.000026941299438477
max:    0.0001068115234375
avg:    0.000033095939872191
median: 0.000030517578125
sum:    0.0032103061676025

因此，如果您仍然真的不知道如何，那么这里是解决方案：

$backtrace = debug_backtrace();
echo 'Mu name is '.$backtrace[1]['function'].', and I have called him! Muahahah!';

使用debug_backtrace函数：http ://php.net/manual/en/function.debug-backtrace.php

尝试下面的代码。

foreach(debug_backtrace() as $t) {              
   echo $t['file'] . ' line ' . $t['line'] . ' calls ' . $t['function'] . "()<br/>";
}

如果要在堆栈的顶部跟踪调用的确切来源，可以使用以下代码：

$call_origin = end(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS));

这将忽略链接的函数，并且仅获取最相关的调用信息（相关性被宽松地使用，因为它取决于您要完成的工作）。

function findFunction($function, $inputDirectory=""){
    //version 0.1
    $docRoot = getenv("DOCUMENT_ROOT");
    $folderArray = null;
    $dirArray = null;

    // open directory
    $directory = opendir($docRoot.$inputDirectory);

    // get each entry
    while($entryName = readdir($directory)) {
        if(is_dir($entryName) && $entryName != "." && $entryName != ".."){
            $folderArray[] = str_replace($inputDirectory, "", $entryName);
        }
        $ext = explode(".", $entryName);
        if(!empty($ext[1])){
            $dirArray[] = $docRoot.$inputDirectory."/".$entryName;
        }
    }

    // close directory
    closedir($directory);
    $found = false;

    if(is_array($dirArray)){
        foreach($dirArray as $current){
            $myFile = file_get_contents($current);
            $myFile = str_replace("<?php", "", $myFile);
            $myFile = str_replace("?>", "", $myFile);
            if(preg_match("/function ".$function."/", $myFile)){
                $found = true;
                $foundLocation = $current;
                break;
            }
        }
    }
    if($found){
        echo $foundLocation;
        exit;
    } else if(is_array($folderArray)){
        foreach($folderArray as $folder){
            if(!isset($return)){
                $return = findFunction($function, $inputDirectory."/".$folder);
            } else if($return == false){
                $return = findFunction($function, $inputDirectory."/".$folder);
            }
        }
    } else {
        return false;
    }
}

findFunction("testFunction", "rootDirectory");

希望它能帮助到别人。如果实际功能不在httpdocs之外，则找不到该功能，因为服务器将被设置为不允许该功能。也只对一个文件夹进行了深入测试，但递归方法在理论上应该可行。

就像0.1版本一样，但是我不打算继续开发它，因此如果有人进行更新，可以随时重新发布。