php取到调用时实参位置的内容

getArgName.php

<?php

/**
 * @param int $argPos
 */
function getArgName($argPos) {
    $db = debug_backtrace();
    $fileStr = file_get_contents($db[1]["file"]);
    $lineList = explode("\n", $fileStr);
    $line = trim($lineList[$db[1]["line"] - 1]);
    $funCallStr = $db[1]["function"]."(";
    $funCallPos = strpos($line, $funCallStr);
    $argsStr = substr($line, $funCallPos+strlen($funCallStr));
//    $argsStr = '$user , ssd()  ,dd3(dd4($ff(),gg()))  );';
    $c = 0;
    $currentLv = 0;
    $lv0ArgList = [];
    $currentLv0Arg = "";
    while (1) {
        if ($argsStr[$c] === "(") {
            $currentLv += 1;
            $currentLv0Arg .= $argsStr[$c];
        }
        elseif ($argsStr[$c] === ")") {
            $currentLv -= 1;
            $currentLv0Arg .= $argsStr[$c];
            if ($currentLv <= 0) {
                if ($currentLv === 0) {
                    $lv0ArgList[] = trim(trim($currentLv0Arg), ", \t\n\r\0\x0B");
                } else {
                    $lv0ArgList[] = trim(trim($currentLv0Arg), "), \t\n\r\0\x0B");
                }
                $currentLv0Arg = "";
            }
        }
        elseif ($argsStr[$c] === ",") {
            $currentLv0Arg .= $argsStr[$c];
            if ($currentLv === 0) {
                if (trim($currentLv0Arg) !== ",") {
                    $lv0ArgList[] = trim(trim($currentLv0Arg), ", \t\n\r\0\x0B");
                    $currentLv0Arg = "";
                }
            }
        } else {
            $currentLv0Arg .= $argsStr[$c];
        }
        if ($currentLv < 0) {
            break;
        }
        $c++;
        if ($c >= strlen($argsStr)) {

            break;
        }
    }
    return $lv0ArgList[$argPos];
}

function test($xcc, $str) {
    var_dump($str);

    $strArgPos = 1;
    $argName = getArgName($strArgPos);
    var_dump($argName);
}

$user = "xxx";
$xxx2 = function () use ($user) {
    test(222/*test*/, $user/*test*/);
};

$xxx2();

/*
*输出
$php getArgName.php
string(3) "xxx"
string(13) "$user/*test*/"

*/

代码的限制是

• 函数调用必须在一行以内，不能写成多行。
• 函数调用只认那一行第一次调用。