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1<?php
2
3namespace FileUtil;
4
5use ExecWithFallback\ExecWithFallback;
6
7/**
8 * A fileExist implementation using exec()
9 *
10 * @package    FileUtil
11 * @author     Bjørn Rosell <it@rosell.dk>
12 */
13class FileExistsUsingExec
14{
15
16    /**
17     * A fileExist based on an exec call.
18     *
19     * @throws \Exception  If exec cannot be called
20     * @return boolean|null  True if file exists. False if it doesn't.
21     */
22    public static function fileExists($path)
23    {
24        if (!ExecWithFallback::anyAvailable()) {
25            throw new \Exception(
26                'cannot determine if file exists using exec() or similar - the function is unavailable'
27            );
28        }
29
30        // Lets try to find out by executing "ls path/to/cwebp"
31        ExecWithFallback::exec('ls ' . $path, $output, $returnCode);
32        if (($returnCode == 0) && (isset($output[0]))) {
33            return true;
34        }
35
36        // We assume that "ls" command is general available!
37        // As that failed, we can conclude the file does not exist.
38        return false;
39    }
40}