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<?php |
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|
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namespace FileUtil; |
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|
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use ExecWithFallback\ExecWithFallback; |
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|
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/** |
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* A fileExist implementation using exec() |
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* |
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* @package FileUtil |
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* @author Bjørn Rosell <[email protected]> |
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*/ |
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class FileExistsUsingExec |
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{ |
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|
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/** |
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* A fileExist based on an exec call. |
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* |
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* @throws \Exception If exec cannot be called |
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* @return boolean|null True if file exists. False if it doesn't. |
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*/ |
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public static function fileExists($path) |
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{ |
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if (!ExecWithFallback::anyAvailable()) { |
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throw new \Exception( |
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'cannot determine if file exists using exec() or similar - the function is unavailable' |
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); |
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} |
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|
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// Lets try to find out by executing "ls path/to/cwebp" |
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ExecWithFallback::exec('ls ' . $path, $output, $returnCode); |
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if (($returnCode == 0) && (isset($output[0]))) { |
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return true; |
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} |
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|
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// We assume that "ls" command is general available! |
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// As that failed, we can conclude the file does not exist. |
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return false; |
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} |
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} |
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|
