<?php
declare(strict_types=1);

header('Content-Type: text/plain; charset=utf-8');

$candidates = PHP_OS_FAMILY === 'Windows'
    ? ['python', 'py']
    : ['/usr/bin/python3', '/usr/bin/python', 'python3', 'python'];

$probe = <<<'PY'
import platform
import sys

print(sys.version)
print(sys.executable)
print("machine=" + platform.machine())
print("system=" + platform.system())
print("platform=" + platform.platform())
PY;

foreach ($candidates as $pythonBinary) {
    $command = $pythonBinary . ' -c ' . escapeshellarg($probe);
    $output = [];
    $resultCode = 0;
    exec($command . ' 2>&1', $output, $resultCode);

    echo "Kandidat: " . $pythonBinary . PHP_EOL;
    echo "Exit-Code: " . $resultCode . PHP_EOL;
    echo implode(PHP_EOL, $output) . PHP_EOL;
    echo str_repeat('-', 60) . PHP_EOL;
}