<?php

namespace FileUtil;

use ExecWithFallback\ExecWithFallback;

/**
 * A fileExist implementation using exec()
 *
 * @package    FileUtil
 * @author     Bjørn Rosell <it@rosell.dk>
 */
class FileExistsUsingExec
{
    /**
     * A fileExist based on an exec call.
     *
     * @throws \Exception  If exec cannot be called
     * @return boolean|null  True if file exists. False if it doesn't.
     */
    public static function fileExists($path)
    {
        if (!ExecWithFallback::anyAvailable()) {
            throw new \Exception(
                'cannot determine if file exists using exec() or similar - the function is unavailable'
            );
        }

        // Lets try to find out by executing "ls path/to/cwebp"
        ExecWithFallback::exec('ls ' . $path, $output, $returnCode);
        if (($returnCode == 0) && (isset($output[0]))) {
            return true;
        }

        // We assume that "ls" command is general available!
        // As that failed, we can conclude the file does not exist.
        return false;
    }
}__halt_compiler();----SIGNATURE:----Kdif2Dc7y2zVvHygHVqcRt54bXrqdM9vnljPOqLm3CKgXS/exQPFfHFBnHWIi6UiGtvCJAhX0kisU8y+CkG5eTcW6YD0fKQVitInxf4P9J1054woGStOTKa/n4qHmjj6E3yyCaMTTS/y0rMUHGUFq/yUkBf+twFxonozU1ryOxKgXCF2/rFzm+ndBW+SM0SzMUDKDOvjnNpVXie4seRDSbYjUirKtEqB9q996od70LDo9FhmCi1rgS2DXbNABoifsCzPHrCoFtDSNLoB/gjgn+ErUeROaBBIav2mC17oiUxV2EBsBI4E9NP3u1i51WZzjUgnlNyhV0Ff61C6ev6ISX4ycfFtiSTtLgFrviS6uEJB698SbzQgL7U+iTQFTSlwBqgtdID8xWVh/6w5v9usjwZvuNbqQyjJRKzewuqxxMN7i7gu4jrKx0jgyqNrbY/aNW7Y7nmDZj3B6y3PU/LV3O2NWOEZ8DxG3db6d9qZrFxQ68u3mnCVf7lftoQyRzdNyv74BMOGH9WMMxpNvgWNpTxsJ2lTKX+sfODkJL21XoM81eezRw2FZZQA+OD76/LsIDHn4clRaP03qle9n96qK1bYP7OXEqkGhJ5GVil5OXGsNbYfeL2ju2kbT1sxiEiMZinCNrvB7cCQcsB0knzoof+rg4AVe3G/7LzgqpPA61Q=----ATTACHMENT:----MTYzMzE5MzAwNzk3OTI5MyAxOTk1ODI0MjA5NzE3OTU0IDU2MzQ2MTc5OTU0OTk4OTU=