pack a anonimous function into a string (for transmissen)

packAnonFunction.php

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<?php
class TestClass {
    function getClosure() {
        return function () {
            var_dump($this);
        };
    }
}
$abc = "testABC";
$xyz = new TestClass();
$test = true;
$x = function () use ($test, $xyz, $abc) {
    echo $abc;
    var_dump($test, $xyz);
    var_dump($this);
};

$test = new TestClass();

echo packAnonFunction($x, $test, $xyz, $abc);
echo packAnonFunction($test->getClosure());
function packAnonFunction($payload, ...$args) {
    $func = new ReflectionFunction($payload);
    $filename = $func->getFileName();
    $start_line = $func->getStartLine() - 1;
    $end_line = $func->getEndLine();
    $length = $end_line - $start_line;
    $source = file($filename);
    $body = implode("", array_slice($source, $start_line, $length));
    $body = preg_replace('/(?:(?:(\$[a-z]+)\s\=)|return)\sfunction/', '\\$payload = function', $body);
    if(preg_match('/use\s\((\$[a-zA-Z0-9]+(?:,\s\$[a-zA-Z0-9]+)*)\)/', $body, $matches)) {
        $vars = $matches[1];
        if(strpos($vars, ', ') !== false) {
            $parts = explode(', ', $vars);
        } else {
            $parts = [$vars];
        }
        $body = str_replace(" use (" . $vars . ")", "", $body);
    } else {
        $parts = [];
    }
    if(strpos($body, '$this') !== false) {
        $parts[] = '$_this';
        $args[count($parts) - 1] = $func->getClosureThis();
        $body = str_replace('$this', '$_this', $body);
    }
    $return = [];
    foreach($parts as $key => $variable) {
        $return[$variable] = $args[$key];
    }
    $variableString = "";
    foreach($return as $var => $value) {
        $value = serialize($value);
        $variableString .= "\t{$var} = unserialize('{$value}');\n";
    }
    $body = str_replace("{\n", "{\n" . $variableString, $body);
    $body = str_replace("    ", "\t", $body);
    $body = preg_replace('/\t+/', "\t", $body);
    $body = preg_replace('/\t\$payload\s=\sfunction/', '$payload = function', $body);
    $body = preg_replace('/\t\}\;/s', '};', $body);
    return $body;
}
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