php处理多图上传压缩代码功能

  
  
  
  


  

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2、前端图片压缩后，请求到自定义的接口upload_deal.php.代码如下
<&＃63;php
require_once('public_func.php');
  actionUpload('uploads/','file'); //参数分别代表图片存储的路径和上传的文件名
}
3、在第二部引入public_func.php,这块代码主要是对后端处理图片压缩
function actionUpload($path = '/uploads/',$filename='myFile')
  {
    // $path = 'uploads/';  //图片存放根目录 根据自己项目路径而定
    $file = $_FILES[$filename]['name'];
    $folder = $path.date('Ymd')."/";
    $pre = rand(999,9999).time();
    $ext = strrchr($file,'.');
    $newName = $pre.$ext;
    $out = array(
      'msg'=>'',
      'status'=>'error',
      'img_url'=>''
    );
    if(!is_dir($folder))
    {
      if(!mkdir($folder, 0777, true)){
        $out['msg'] = '图片目录创建失败！';
        echo json_encode($out);
        exit;
      }
    }
    $im = $_FILES[$filename]['tmp_name']; //上传图片资源
    $max; //设置图片的最大宽度
    $max; //设置图片的最大高度
    $imgname = $folder.$newName; //图片存放路径 根据自己图片路径而定
    $filetype=$_FILES[$filename]['type'];//图片类型
    $result = thumbImage($im,$maxwidth,$maxheight,$imgname,$filetype);
    if($result){
      $out['msg'] = '图片上传成功';
      $out['status'] = 'success';
      $out['img_url'] = $folder.$newName;
    }else{
      $out['msg'] = '图片上传失败';
    }
    return json_encode($out);
    exit;
  }
  //压缩图片
  function thumbImage($im,$maxwidth,$maxheight,$name,$filetype)
  {
    switch ($filetype) {   
      case 'image/pjpeg':   
      case 'image/jpeg':   
        $im = imagecreatefromjpeg($im);  //PHP图片处理系统函数
        break;   
      case 'image/gif':   
        $im = imagecreatefromgif($im);  
        break;   
      case 'image/png':   
        $im = imagecreatefrompng($im);  
        break;
      case 'image/wbmp':   
        $im = imagecreatefromwbmp($im);  
        break;       
    } 
    $resizewidth_tag = $resizeheight_tag = false;
    $pic_width = imagesx($im);
    $pic_height = imagesy($im);
    if(($maxwidth && $pic_width > $maxwidth) || ($maxheight && $pic_height > $maxheight))
    {
  $resizewidth_tag = $resizeheight_tag = false;
      if($maxwidth && $pic_width>$maxwidth)
      {
        $widthratio = $maxwidth / $pic_width;
        $resizewidth_tag = true;
      }
      if($maxheight && $pic_height>$maxheight)
      {
        $heightratio = $maxheight / $pic_height;
        $resizeheight_tag = true;
      }
      if($resizewidth_tag && $resizeheight_tag)
      {
        if($widthratio <$heightratio)
         $ratio = $widthratio;
        else
         $ratio = $heightratio;
      }
      if($resizewidth_tag && !$resizeheight_tag)
      $ratio = $widthratio;
      if($resizeheight_tag && !$resizewidth_tag)
      $ratio = $heightratio;
      $newwidth = $pic_width * $ratio;
      $newheight = $pic_height * $ratio;
      if(function_exists("imagecopyresampled"))
      {
        $newim = imagecreatetruecolor($newwidth,$newheight);//PHP图片处理系统函数
        imagecopyresampled($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);//PHP图片处理系统函数
      }
      else
      {
        $newim = imagecreate($newwidth,$newheight);
        imagecopyresized($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);
      }
      switch ($filetype) {   
        case 'image/pjpeg' :   
        case 'image/jpeg' :   
          $result = imagejpeg($newim,$name);  
          break;   
        case 'image/gif' :   
          $result = imagegif($newim,$name);  
          break;   
        case 'image/png' :   
          $result = imagepng($newim,$name);  
          break;
        case 'image/wbmp' :   
          $result = imagewbmp($newim,$name);  
          break;       
      } 
      imagedestroy($newim);
    }
    else
    {
      switch ($filetype) {   
        case 'image/pjpeg' :   
        case 'image/jpeg' :   
          $result = imagejpeg($im,$name);  
          break;   
        case 'image/gif' :   
          $result = imagegif($im,$name);  
          break;   
        case 'image/png' :   
          $result = imagepng($im,$name);  
          break;
        case 'image/wbmp' :   
          $result = imagewbmp($im,$name);  
          break;       
      }
    }
    return $result; 
  }