<"Content-type: image/png");
  $im = imagecreate($s / $w, $h * $c * 2);
  imagecolorallocate($im, 0xff, 0xff, 0xff); // white bg
  $color = imagecolorallocate($im, 0, 0, 255); // black
  imagestring($im, 5, 5, 5, $str, $color);
  $x=0; $y = array(); $yn = array();
  for($i = 0; $i < $c; $i++) $y[$i] = $h * $i + $h;
  $n = $l * $w;
  while(1)
  {
   if($s == 0) 
    break;
   if($s < $n) 
    $n = $s;
   $samples = fread($fp, 1000 * $n);
   if($samples === FALSE)
    break;
   $packed = unpack("s*", $samples);
   foreach($packed as $k=>$v)
   {
    $cnt = ($k-1) % ($w * $l) ;
    if( $cnt > $c - 1) 
     continue;
    $yn[$cnt] = $h * $cnt + $h - $v / $f;
    imageline($im, $x, $y[$cnt], $x+1, $yn[$cnt], $color);
    $y[$cnt] = $yn[$cnt];
    $x++;
   }
   $s -= $n;
  }
  imagepng($im);
  imagedestroy($im);
 }
 wav_graph('GetWave.wav');
"//img.jbzj.com/file_images/article/201504/2015421162550230.jpg" alt="" />

希望本文所述对大家的php程序设计有所帮助。