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<?php |
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|
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namespace ExecWithFallback; |
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|
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/** |
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* Emulate exec() with system() |
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* |
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* @package ExecWithFallback |
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* @author Bjørn Rosell <[email protected]> |
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*/ |
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class ShellExec |
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{ |
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|
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/** |
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* Emulate exec() with shell_exec() |
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* |
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* @param string $command The command to execute |
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* @param string &$output (optional) |
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* @param int &$result_code (optional) |
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* |
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* @return string | false The last line of output or false in case of failure |
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*/ |
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public static function exec($command, &$output = null, &$result_code = null) |
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{ |
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$resultCodeSupplied = (func_num_args() >= 3); |
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if ($resultCodeSupplied) { |
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throw new \Exception('ShellExec::exec() does not support $result_code argument'); |
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} |
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|
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$result = shell_exec($command); |
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|
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// result: |
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// - A string containing the output from the executed command, |
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// - false if the pipe cannot be established |
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// - or null if an error occurs or the command produces no output. |
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|
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if ($result === false) { |
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return false; |
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} |
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if (is_null($result)) { |
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// hm, "null if an error occurs or the command produces no output." |
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// What were they thinking? |
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// And yes, it does return null, when no output, which is confirmed in the test "echo hi 1>/dev/null" |
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// What should we do? Throw or accept? |
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// Perhaps shell_exec throws in newer versions of PHP instead of returning null. |
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// We are counting on it until proved wrong. |
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return ''; |
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} |
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|
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$theOutput = preg_split('/\s*\r\n|\s*\n\r|\s*\n|\s*\r/', $result); |
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|
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// remove the last element if it is blank |
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if ((count($theOutput) > 0) && ($theOutput[count($theOutput) -1] == '')) { |
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array_pop($theOutput); |
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} |
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|
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if (count($theOutput) == 0) { |
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return ''; |
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} |
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if (gettype($output) == 'array') { |
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foreach ($theOutput as $line) { |
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$output[] = $line; |
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} |
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} else { |
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$output = $theOutput; |
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} |
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return $theOutput[count($theOutput) -1]; |
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} |
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} |
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|
