This code retrieves an mp3 from Google Text-to-Speech for a query and converts it to oggvorbis using ffmpeg so it's cross-browser compatible. You can use it in a src attribute of an <audio> tag like you would with the Google TTS API. Uses STDIN/OUT, not f

google-tts-to-ogg.php

<?php

// ffmpeg command. currently converts mp3 to oggvorbis
$ffmpeg_cmd = "ffmpeg -i - -acodec libvorbis -f ogg -";

// Set headers for ogg binary data
header("Accept-Ranges: bytes");
header("Content-Type: application/ogg");
header("Content-Transfer-Encoding: binary");

// Get mp3 data from Google TTS
$qs = http_build_query(array("ie" => "utf-8","tl" => $_GET["tl"], "q" => $_GET["q"]));
$ctx = stream_context_create(array("http"=>array("method"=>"GET","header"=>"Referer: \r\n")));
$soundfile = file_get_contents("http://translate.google.com/translate_tts?".$qs, false, $ctx);

$descriptorspec = array(
   0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => array("file", "/tmp/error-output.txt", "a") // stderr is a file to write to
);

$process = proc_open($ffmpeg_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
    // Any error output will be appended to /tmp/error-output.txt

    fwrite($pipes[0], $soundfile);
    fclose($pipes[0]);

    $oggOutput = stream_get_contents($pipes[1]);
    fclose($pipes[1]);

    // It is important that you close any pipes before calling
    // proc_close in order to avoid a deadlock
    $return_value = proc_close($process);

  	echo $oggOutput;
}
 
?>

Based on this.