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

三个文件代码如下： 连接数据库：

connect.php

prepare($insert_sql); $result -> bind_param("ss",$real_img,$small_img); $result -> execute(); ?>

//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,$uploadfile,$newwidth,$newheight,$width,$height);
}
else
{
$uploaddir_resize = imagecreate($newwidth,$newheight);
imagecopyresized($uploaddir_resize,$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

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