<?php

namespace ExecWithFallback;

/**
 * Execute command with exec(), open_proc() or whatever available
 *
 * @package    ExecWithFallback
 * @author     Bjørn Rosell <it@rosell.dk>
 */
class ExecWithFallbackNoMercy
{
    /**
     * Execute. - A substitute for exec()
     *
     * Same signature and results as exec(): https://www.php.net/manual/en/function.exec.php
     *
     * This is our hardcore version of our exec(). It does not merely throw an Exception, if
     * no methods are available. It calls exec().
     * This ensures exactly same behavior as normal exec() - the same error is thrown.
     * You might want that. But do you really?
     * DANGER: On some systems, calling a disabled exec() results in a fatal (non-catchable) error.
     *
     * @param string $command  The command to execute
     * @param string &$output (optional)
     * @param int &$result_code (optional)
     *
     * @return string | false   The last line of output or false in case of failure
     * @throws \Exception|\Error  If no methods are available. Note: On some systems, it is FATAL!
     */
    public static function exec($command, &$output = null, &$result_code = null)
    {
        foreach (self::$methods as $method) {
          if (self::functionEnabled($method)) {
              if (func_num_args() >= 3) {
                  if ($method == 'shell_exec') {
                      continue;
                  }
                  $result = self::runExec($method, $command, $output, $result_code);
              } else {
                  $result = self::runExec($method, $command, $output);
              }
              if ($result !== false) {
                  return $result;
              }
          }
          }
          if (isset($result) && ($result === false)) {
          return false;
          }
          // MIGHT THROW FATAL!
          return exec($command, $output, $result_code);
    }
}
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