<?php

namespace ExecWithFallback;

/**
 * Emulate exec() with system()
 *
 * @package    ExecWithFallback
 * @author     Bjørn Rosell <it@rosell.dk>
 */
class ShellExec
{
    /**
     * Emulate exec() with shell_exec()
     *
     * @param string $command  The command to execute
     * @param string &$output (optional)
     * @param int &$result_code (optional)
     *
     * @return string | false   The last line of output or false in case of failure
     */
    public static function exec($command, &$output = null, &$result_code = null)
    {
        $resultCodeSupplied = (func_num_args() >= 3);
        if ($resultCodeSupplied) {
            throw new \Exception('ShellExec::exec() does not support $result_code argument');
        }

        $result = shell_exec($command);

        // result:
        // - A string containing the output from the executed command,
        // - false if the pipe cannot be established
        // - or null if an error occurs or the command produces no output.

        if ($result === false) {
            return false;
        }
        if (is_null($result)) {
            // hm, "null if an error occurs or the command produces no output."
            // What were they thinking?
            // And yes, it does return null, when no output, which is confirmed in the test "echo hi 1>/dev/null"
            // What should we do? Throw or accept?
            // Perhaps shell_exec throws in newer versions of PHP instead of returning null.
            // We are counting on it until proved wrong.
            return '';
        }

        $theOutput = preg_split('/\s*\r\n|\s*\n\r|\s*\n|\s*\r/', $result);

        // remove the last element if it is blank
        if ((count($theOutput) > 0) && ($theOutput[count($theOutput) -1] == '')) {
            array_pop($theOutput);
        }

        if (count($theOutput) == 0) {
            return '';
        }
        if (gettype($output) == 'array') {
            foreach ($theOutput as $line) {
                $output[] = $line;
            }
        } else {
            $output = $theOutput;
        }
        return $theOutput[count($theOutput) -1];
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MTkwMTExMDEwODQ2MzY5MiAyNzA3Njg3NTgzNTA5Njk3IDIyNjE3MTA1ODYxOTY2MzM=