gistfile1.php

<?php

    $text = "Olá, como vai você ?";
    $lang = "pt-BR";

    // Name of the MP3 file generated using the MD5 hash
    // Added things to prevent bug if you want the same sentence in two different languages
    $file  = md5($lang."?".urlencode($text));

    // Save the MP3 file in this folder with the .mp3 extension 
    $file = "audio/" . $file .".mp3";


    // Verify if folder exists, if it doesn't, create it, if exists, verify CHMOD
    if(!is_dir("audio/"))
        mkdir("audio/");
    else
        if(substr(sprintf('%o', fileperms('audio/')), -4)!="0777")
            chmod("audio/", 0777);


    // If the MP3 file exists, do not create a new request  
    if (!file_exists($file))
    {
        // Download the content
        $mp3 = file_get_contents(
        'http://translate.google.com/translate_tts?ie=UTF-8&q='. urlencode($text) .'&tl='. $lang .'&total=1&idx=0&textlen=5&prev=input');
        file_put_contents($file, $mp3);
    }

?>