php图片压缩

最新推荐文章于 2024-06-10 23:57:19 发布

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index2.php负责处理图片压缩部分的逻辑

<?php
$pic_name=date("YmdHis");
// 生成图片的宽度 $pic_width=500;
$pic_width=$_POST['width'];
// 生成图片的高度 $pic_height=500;
$pic_height=$_POST['length'];
function ResizeImage($im,$maxwidth,$maxheight,$name){
 //取得当前图片大小
 $width = imagesx($im);
 $height = imagesy($im);
 //生成缩略图的大小
 if(($width > $maxwidth) || ($height > $maxheight)){
  $widthratio = $maxwidth/$width;
  $heightratio = $maxheight/$height;
  if($widthratio < $heightratio){
   $ratio = $widthratio;
  }else{
   $ratio = $heightratio;
  }
  $newwidth = $width * $ratio;
  $newheight = $height * $ratio;

  if(function_exists("imagecopyresampled")){
   $newim = imagecreatetruecolor($newwidth, $newheight);
   imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
  }else{
   $newim = imagecreate($newwidth, $newheight);
   imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
  }
  ImageJpeg ($newim,$name . ".jpg");
  ImageDestroy ($newim);
 }else{
  ImageJpeg ($im,$name . ".jpg");
 }
}

if($_FILES['image']['size']){
 //echo $_FILES['image']['type'];
 if($_FILES['image']['type'] == "image/pjpeg"||$_FILES['image']['type'] == "image/jpg"||$_FILES['image']['type'] == "image/jpeg"){
  $im = imagecreatefromjpeg($_FILES['image']['tmp_name']);
 }elseif($_FILES['image']['type'] == "image/x-png"){
  $im = imagecreatefrompng($_FILES['image']['tmp_name']);
 }elseif($_FILES['image']['type'] == "image/gif"){
  $im = imagecreatefromgif($_FILES['image']['tmp_name']);
 }
 if($im){
  if(file_exists($pic_name.'.jpg')){
   unlink($pic_name.'.jpg');
  }
  ResizeImage($im,$pic_width,$pic_height,$pic_name);
  ImageDestroy ($im);
 }
} 
?>

前端表单数据form提交

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP上传图片自动压缩</title>
</head>

<body>
<img src="<? echo $pic_name.'.jpg'; ?>"><br><br>     
<form enctype="multipart/form-data" method="post" action="index2.php">     
<br>     
<input type="file" name="image" size="50" value="浏览"><p>     
生成缩略图宽度：<input type="text" name="width" size="5"><p>    
生成缩略图长度：<input type="text" name="length" size="5"><p>    
<input type="submit" value="上传图片">     
</form>
</body>
</html>