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copied!<p>Put this in a class:</p> <pre><code>/** * Given a string ($data) with a file's contents, guess and return the mime type * * Uses the standard unix program /usr/bin/file to handle the magic (pun intended) * * @param string $data */ public static function get_string_mime_type($data) { $file_cmd = '/usr/bin/file --brief --mime-type --no-buffer -'; return rtrim(self::exec_write_read($file_cmd, $data)); } /** * Executes $cmd, writes to $cmd's stdin, then returns what $cmd wrote to stdout */ private static function exec_write_read($cmd, $write, $log_errors = false) { $descriptorspec = array( 0 => array("pipe", "r"), // stdin is a pipe that $cmd will read from 1 => array("pipe", "w"), // stdout is a pipe that $cmd will write to 2 => array("pipe", "w"), // stderr is a pipe that $cmd will write to ); $process = proc_open($cmd, $descriptorspec, $pipes); if (is_resource($process)) { // $pipes now looks like this: // 0 => writeable handle connected to child stdin // 1 => readable handle connected to child stdout // 2 => readable handle connected to child stderr fwrite($pipes[0], $write); fclose($pipes[0]); $output = stream_get_contents($pipes[1]); fclose($pipes[1]); if( $log_errors ){ error_log(stream_get_contents($pipes[2])); } fclose($pipes[2]); // It is important that you close any pipes before calling // proc_close in order to avoid a deadlock $exit_code = proc_close($process); return $output; } else { throw new Exception("Couldn't open $cmd"); } } </code></pre>

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