<form method="post">
<input id="txt" name="txt" type="textbox" />
<input name="submit" type="submit" value="Convert to Speech" />
</form>
<?php
if(isset($_POST['txt'])){
   $txt=$_POST['txt'];
  $text = urlencode($txt);
  $lang = urldecode("en-IN");
  $file  = "audio/" . md5($text) .".mp3";
      if (!file_exists($file) || filesize($file) == 0) {          
        $mp3 = file_get_contents('https://translate.google.co.in/translate_tts?ie=UTF-8&tl='.$lang.'&q='.$text.'&client=gtx');
        if(file_put_contents($file, $mp3)){         
          ?>
          <audio controls>  
            <source src="<?php echo $file; ?>" type="audio/mpeg">
          Your browser does not support the audio element.
          </audio>
          <?php
        }else{
          echo "Wasn't able to save it !<br>";
        }
      } else {
        echo "Already exist<br>";
      }
}
?>