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run code in 300+ PHP versions simultaneously

@ 2023-01-19T19:24:36Z

<?php

function get_calling_scope() {
    $trace = debug_backtrace(\DEBUG_BACKTRACE_PROVIDE_OBJECT);
    array_shift($trace); // Remove current frame

    $frame = array_shift($trace);
    if ($frame === null) {
        return null;
    }
    
    $function = $frame['function'];
    if (!in_array($function, ['__get', '__set', '__isset', '__unset', '__call', '__callStatic'], true)) {
        return null;
    }

    $object = $frame['object'] ?? null;
    $property = $frame['args'][0];
    
    foreach ($trace as $previousFrame) {
        $previousObject = $previousFrame['object'] ?? null;
        if ($previousFrame['function'] !== $function
            || $previousObject !== $object
            || $previousFrame['args'][0] !== $property) {
            return $previousObject !== null
                ? $previousObject::class
                : null;
        }
    }
    
    return null;
}

class Foo {
    public function __get($name) {
        var_dump(get_calling_scope());
        return '';
    }

    public function test() {
        $this->bar;
    }
}

class Bar extends Foo {
    public function __get($name) {
        parent::__get($name);
        return '';
    }
}

$foo = new Foo();
$foo->bar;
$foo->test();

$bar = new Bar();
$bar->test();

Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.27, 8.3.29 - 8.3.30, 8.4.1 - 8.4.14, 8.4.16 - 8.4.17, 8.5.0 - 8.5.2: NULL string(3) "Foo" string(3) "Bar"
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.3.28: /bin/php-8.3.28: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.3.28)
Process exited with code 1.

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