PHP实现图片上传并压缩

本文实例讲解了PHP图片上传并压缩的实现方法，分享给大家供大家参考，具体内容如下

使用到三个文件

• connect.php：连接数据库
• test_upload.php：执行SQL语句
• upload_img.php：上传图片并压缩
  

三个文件代码如下：
连接数据库：connect.php

<?php
$db_host = '';
$db_user = '';
$db_psw = '';
$db_name = '';
$db_port = '';
$sqlconn=new mysqli($db_host,$db_user,$db_psw,$db_name);
$q="set names utf8;";
$result=$sqlconn->query($q);
if (mysqli_connect_errno()) {
 printf("Connect failed: %s\n", mysqli_connect_error());
 exit();
}
?>

执行SQL语句：test_upload.php

<?php
require ("connect.php");
require ("upload_img.php");
$real_img=$uploadfile;
$small_img=$uploadfile_resize;
$insert_sql = "insert into img (real_img,small_img) values (?,?)";
$result = $sqlconn -> prepare($insert_sql);
$result -> bind_param("ss", $real_img,$small_img);
$result -> execute();
?>

上传图片并压缩：upload_img.php

<?php
//设置文件保存目录
$uploaddir = "upfiles/";
//设置允许上传文件的类型
$type=array("jpg","gif","bmp","jpeg","png"); 

//获取文件后缀名函数
function fileext($filename)
{
 return substr(strrchr($filename, '.'), 1);
} 

//生成随机文件名函数
function random($length)
{
 $hash = 'CR-';
 $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
 $max = strlen($chars) - 1;
 mt_srand((double)microtime() * 1000000);
 for($i = 0; $i < $length; $i++)
 {
  $hash .= $chars[mt_rand(0, $max)];
 }
 return $hash;
} 

$a=strtolower(fileext($_FILES['filename']['name'])); 

//判断文件类型
if(!in_array(strtolower(fileext($_FILES['filename']['name'])),$type))
{
 $text=implode(",",$type);
 $ret_code=3;//文件类型错误
 $page_result=$text;
 $retArray = array('ret_code' => $ret_code,'page_result'=>$page_result);
 $retJson = json_encode($retArray);
 echo $retJson;
 return;
} 

//生成目标文件的文件名
else
{
 $filename=explode(".",$_FILES['filename']['name']);
 do
 {
  $filename[0]=random(10); //设置随机数长度
  $name=implode(".",$filename);
  //$name1=$name.".Mcncc";
  $uploadfile=$uploaddir.$name;
 } 

 while(file_exists($uploadfile)); 

 if (move_uploaded_file($_FILES['filename']['tmp_name'],$uploadfile))
 {
  if(is_uploaded_file($_FILES['filename']['tmp_name']))
  {
   $ret_code=1;//上传失败
  }
 else
 {//上传成功
  $ret_code=0;
 }
 }
$retArray = array('ret_code' => $ret_code);
$retJson = json_encode($retArray);
echo $retJson;
}

//压缩图片

$uploaddir_resize="upfiles_resize/";
$uploadfile_resize=$uploaddir_resize.$name;

//$pic_width_max=120;
//$pic_height_max=90;
//以上与下面段注释可以联合使用，可以使图片根据计算出来的比例压缩

$file_type=$_FILES["filename"]['type'];

function ResizeImage($uploadfile,$maxwidth,$maxheight,$name)
{
 //取得当前图片大小
 $width = imagesx($uploadfile);
 $height = imagesy($uploadfile);
 $i=0.5;
 //生成缩略图的大小
 if(($width > $maxwidth) || ($height > $maxheight))
 {
  /*
  $widthratio = $maxwidth/$width;
  $heightratio = $maxheight/$height;

  if($widthratio < $heightratio)
  {
   $ratio = $widthratio;
  }
  else
  {
    $ratio = $heightratio;
  }

  $newwidth = $width * $ratio;
  $newheight = $height * $ratio;
  */
  $newwidth = $width * $i;
  $newheight = $height * $i;
  if(function_exists("imagecopyresampled"))
  {
   $uploaddir_resize = imagecreatetruecolor($newwidth, $newheight);
   imagecopyresampled($uploaddir_resize, $uploadfile, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
  }
  else
  {
   $uploaddir_resize = imagecreate($newwidth, $newheight);
   imagecopyresized($uploaddir_resize, $uploadfile, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
  }

  ImageJpeg ($uploaddir_resize,$name);
  ImageDestroy ($uploaddir_resize);
 }
 else
 {
  ImageJpeg ($uploadfile,$name);
 }
}

if($_FILES["filename"]['size'])
{
 if($file_type == "image/pjpeg"||$file_type == "image/jpg"|$file_type == "image/jpeg")
 {
  //$im = imagecreatefromjpeg($_FILES[$upload_input_name]['tmp_name']);
  $im = imagecreatefromjpeg($uploadfile);
 }
 elseif($file_type == "image/x-png")
 {
  //$im = imagecreatefrompng($_FILES[$upload_input_name]['tmp_name']);
  $im = imagecreatefromjpeg($uploadfile);
 }
 elseif($file_type == "image/gif")
 {
  //$im = imagecreatefromgif($_FILES[$upload_input_name]['tmp_name']);
  $im = imagecreatefromjpeg($uploadfile);
 }
 else//默认jpg
 {
  $im = imagecreatefromjpeg($uploadfile);
 }
 if($im)
 {
  ResizeImage($im,$pic_width_max,$pic_height_max,$uploadfile_resize);

  ImageDestroy ($im);
 }
}
?>

请按照现实情况更改connect.php，test_upload.php中对应的信息。

以上就是PHP实现图片上传并压缩的方法，希望对大家的学习php程序设计有所帮助