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<?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; } }
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