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【PHP】 PHP调整图像尺寸

作者:窦骁年华 / 发布于2012/3/6/ 602

创建图像缩略图需要许多时间，此代码将有助于了解缩略图的逻辑。

<div>/**********************</div>
<div>*@filename - path to the image</div>
<div>*@tmpname - temporary path to thumbnail</div>
<div>*@xmax - max width</div>
<div>*@ymax - max height</div>
<div>*/</div>
<div>function resize_image($filename, $tmpname, $xmax, $ymax)</div>
<div>{</div>
<div>  $ext = explode(".", $filename);</div>
<div>  $ext = $ext[count($ext)-1]; </div>
<div></div>
<div>  if($ext == "jpg" || $ext == "jpeg")</div>
<div>    $im = imagecreatefromjpeg($tmpname);</div>
<div>  elseif($ext == "png")</div>
<div>    $im = imagecreatefrompng($tmpname);</div>
<div>  elseif($ext == "gif")</div>
<div>    $im = imagecreatefromgif($tmpname); </div>
<div></div>
<div>  $x = imagesx($im);</div>
<div>  $y = imagesy($im); </div>
<div></div>
<div>  if($x <= $xmax && $y <= $ymax)</div>
<div>    return $im; </div>
<div></div>
<div>  if($x >= $y) {</div>
<div>    $newx = $xmax;</div>
<div>    $newy = $newx * $y / $x;</div>
<div>  }
<div>  else {</div>
<div>    $newy = $ymax;</div>
<div>    $newx = $x / $y * $newy;</div>
<div>  } </div>
<div></div>
<div>  $im2 = imagecreatetruecolor($newx, $newy);</div>
<div>  imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);</div>
<div>  return $im2;</div>
<div>}
<div></div>

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　调整图像尺寸　

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