目录
1.效果图
2.首先是封装好的图片类（缩放及生成水印）
1.GDBasic.php
<?php
/**
* GDBasic.php
* description GD基础类
*/
namespace test\\Lib;
class GDBasic
{
protected static $_check =false;
//检查服务器环境中gd库
public static function check()
{
//当静态变量不为false
if(static::$_check)
{
return true;
}
//检查gd库是否加载
if(!function_exists(\"gd_info\"))
{
throw new \\Exception(\'GD is not exists\');
}
//检查gd库版本
$version = \'\';
$info = gd_info();
if(preg_match(\"/\\\\d+\\\\.\\\\d+(?:\\\\.\\\\d+)?/\", $info[\"GD Version\"], $matches))
{
$version = $matches[0];
}
//当gd库版本小于2.0.1
if(!version_compare($version,\'2.0.1\',\'>=\'))
{
throw new \\Exception(\"GD requires GD version \'2.0.1\' or greater, you have \" . $version);
}
self::$_check = true;
return self::$_check;
}
}
2.Image.php
<?php
/**
* Image.php
* description 图像类
*/
namespace test\\Lib;
require_once \'GDBasic.php\';
class Image extends GDBasic
{
protected $_width;
protected $_height;
protected $_im;
protected $_type;
protected $_mime;
protected $_real_path;
public function __construct($file)
{
//检查GD库
self::check();
$imageInfo = $this->createImageByFile($file);
$this->_width = $imageInfo[\'width\'];
$this->_height = $imageInfo[\'height\'];
$this->_im = $imageInfo[\'im\'];
$this->_type = $imageInfo[\'type\'];
$this->_real_path = $imageInfo[\'real_path\'];
$this->_mime = $imageInfo[\'mime\'];
}
/**
* 根据文件创建图像
* @param $file
* @return array
* @throws \\Exception
*/
public function createImageByFile($file)
{
//检查文件是否存在
if(!file_exists($file))
{
throw new \\Exception(\'file is not exits\');
}
//获取图像信息
$imageInfo = getimagesize($file);
$realPath = realpath($file);
if(!$imageInfo)
{
throw new \\Exception(\'file is not image file\');
}
switch($imageInfo[2])
{
case IMAGETYPE_GIF:
$im = imagecreatefromgif($file);
break;
case IMAGETYPE_JPEG:
$im = imagecreatefromjpeg($file);
break;
case IMAGETYPE_PNG:
$im = imagecreatefrompng($file);
break;
default:
throw new \\Exception(\'image file must be png,jpeg,gif\');
}
return array(
\'width\' => $imageInfo[0],
\'height\' => $imageInfo[1],
\'type\' => $imageInfo[2],
\'mime\' => $imageInfo[\'mime\'],
\'im\' => $im,
\'real_path\' => $realPath,
);
}
/**
* 缩略图
* @param int $width 缩略图高度
* @param int $height 缩略图宽度
* @return $this
* @throws \\Exception
*/
public function resize($width, $height)
{
if(!is_numeric($width) || !is_numeric($height))
{
throw new \\Exception(\'image width or height must be number\');
}
//根据传参的宽高获取最终图像的宽高
$srcW = $this->_width;
$srcH = $this->_height;
if($width <= 0 || $height <= 0)
{
$desW = $srcW;//缩略图高度
$desH = $srcH;//缩略图宽度
}
else
{
$srcP = $srcW / $srcH;//宽高比
$desP = $width / $height;
if($width > $srcW)
{
if($height > $srcH)
{
$desW = $srcW;
$desH = $srcH;
}
else
{
$desH = $height;
$desW = round($desH * $srcP);
}
}
else
{
if($desP > $srcP)
{
$desW = $width;
$desH = round($desW / $srcP);
}
else
{
$desH = $height;
$desW = round($desH * $srcP);
}
}
}
//PHP版本小于5.5
if(version_compare(PHP_VERSION, \'5.5.0\', \'<\'))
{
$desIm = imagecreatetruecolor($desW, $desH);
if(imagecopyresampled($desIm, $this->_im, 0, 0, 0, 0, $desW, $desH, $srcW, $srcH))
{
imagedestroy($this->_im);
$this->_im = $desIm;
$this->_width = imagesx($this->_im);
$this->_height = imagesy($this->_im);
}
}
else
{
if($desIm = imagescale($this->_im, $desW, $desH))
{
$this->_im = $desIm;
$this->_width = imagesx($this->_im);
$this->_height = imagesy($this->_im);
}
}
return $this;
}
/**
* 根据百分比生成缩略图
* @param int $percent 1-100
* @return Image
* @throws \\Exception
*/
public function resizeByPercent($percent)
{
if(intval($percent) <= 0)
{
throw new \\Exception(\'percent must be gt 0\');
}
$percent = intval($percent) > 100 ? 100 : intval($percent);
$percent = $percent / 100;
$desW = $this->_width * $percent;
$desH = $this->_height * $percent;
return $this->resize($desW, $desH);
}
/**
* 图像旋转
* @param $degree
* @return $this
*/
public function rotate($degree)
{
$degree = 360 - intval($degree);
$back = imagecolorallocatealpha($this->_im,0,0,0,127);
$im = imagerotate($this->_im,$degree,$back,1);
imagesavealpha($im,true);
imagedestroy($this->_im);
$this->_im = $im;
$this->_width = imagesx($this->_im);
$this->_height = imagesy($this->_im);
return $this;
}
/**
* 生成水印
* @param file $water 水印图片
* @param int $pct 透明度
* @return $this
*/
public function waterMask($water =\'\',$pct = 60 )
{
//根据水印图像文件生成图像资源
$waterInfo = $this->createImageByFile($water);
imagecopymerge();
//销毁$this->_im
$this->_im = $waterInfo[\'im\'];
$this->_width = imagesx($this->_im);
$this->_height = imagesy($this->_im);
return $this;
}
/**
* 图片输出
* @return bool
*/
public function show()
{
header(\'Content-Type:\' . $this->_mime);
if($this->_type == 1)
{
imagegif($this->_im);
return true;
}
if($this->_type == 2)
{
imagejpeg($this->_im, null, 80);
return true;
}
if($this->_type == 3)
{
imagepng($this->_im);
return true;
}
}
/**
* 保存图像文件
* @param $file
* @param null $quality
* @return bool
* @throws \\Exception
*/
public function save($file, $quality = null)
{
//获取保存目的文件的扩展名
$ext = pathinfo($file, PATHINFO_EXTENSION);
$ext = strtolower($ext);
if(!$ext || !in_array($ext, array(\'jpg\', \'jpeg\', \'gif\', \'png\')))
{
throw new \\Exception(\'image save file must be jpg ,png,gif\');
}
if($ext === \'gif\')
{
imagegif($this->_im, $file);
return true;
}
if($ext === \'jpeg\' || $ext === \'jpg\')
{
if($quality > 0)
{
if($quality < 1)
{
$quality = 1;
}
if($quality > 100)
{
$quality = 100;
}
imagejpeg($this->_im, $file, $quality);
}
else
{
imagejpeg($this->_im, $file);
}
return true;
}
if($ext === \'png\')
{
imagepng($this->_im, $file);
return true;
}
}
}
style样式不是重点，先不放了
3.ajax类封装文件
let $ = new class {
constructor()
{
this.xhr = new XMLHttpRequest();
this.xhr.onreadystatechange = () => {
if (this.xhr.readyState == 4 && this.xhr.status == 200) {
// process response text
let response = this.xhr.responseText;
if (this.type == \"json\") {
response = JSON.parse(response);
}
this.callback(response);
}
}
}
get(url, parameters, callback, type = \"text\")
{
// url = test.php?username=zhangsan&age=20
// parameters = {\"username\": \"zhangsan\", \"age\": 20}
let data = this.parseParameters(parameters);
if (data.length > 0) {
url += \"?\" + data;
}
this.type = type;
this.callback = callback;
this.xhr.open(\"GET\", url, true);
this.xhr.send();
}
post(url, parameters, callback, type = \"text\")
{
let data = this.parseParameters(parameters);
this.type = type;
this.callback = callback;
this.xhr.open(\"POST\", url, true);
this.xhr.setRequestHeader(\"Content-Type\", \"application/x-www-form-urlencoded\");
this.xhr.send(data);
}
parseParameters(parameters)
{
// username=zhangsan&age=20
let buildStr = \"\";
for (let key in parameters) {
let str = key + \"=\" + parameters[key];
buildStr += str + \"&\";
}
return buildStr.substring(0, buildStr.length - 1);
}
};
1.index.php
<!DOCTYPE html>
<html lang=\"zh-CN\">
<head>
<meta charset=\"utf-8\">
<meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">
<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！-->
<title>文件上传和下载</title>
<!-- Bootstrap -->
<link href=\"style/css/bootstrap.min.css\" rel=\"external nofollow\" rel=\"stylesheet\">
<link href=\"style/css/site.min.css\" rel=\"external nofollow\" rel=\"stylesheet\">
<link rel=\"stylesheet\" href=\"https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css\" rel=\"external nofollow\" >
<style>
.projects .thumbnail .caption {
height: auto;
max-width: auto;
}
.image{
margin:10px auto;
border-radius:5px;
overflow:hidden;
border:1px solid #CCC;
}
.image .caption P{
text-align: center;
}
</style>
</head>
<body>
<!--导航栏-->
<div class=\"navbar navbar-inverse navbar-fixed-top\">
<div class=\"container\">
<div class=\"navbar-header\">
<button class=\"navbar-toggle collapsed\" type=\"button\" data-toggle=\"collapse\" data-target=\".navbar-collapse\">
<span class=\"sr-only\">Toggle navigation</span>
<span class=\"icon-bar\"></span>
<span class=\"icon-bar\"></span>
<span class=\"icon-bar\"></span>
</button>
<a class=\"navbar-brand hidden-sm\" href=\"\" onclick=\" rel=\"external nofollow\" _hmt.push([\'_trackEvent\', \'navbar\', \'click\', \'navbar-首页\'])\">XX网</a>
</div>
<div class=\"navbar-collapse collapse\" role=\"navigation\">
<ul class=\"nav navbar-nav\">
<li class=\"hidden-sm hidden-md\">
<a href=\"\" target=\" rel=\"external nofollow\" rel=\"external nofollow\" _blank\"></a>
</li>
<li>
<a href=\"\" target=\" rel=\"external nofollow\" rel=\"external nofollow\" _blank\"></a>
</li>
</ul>
</div>
</div>
</div>
<!--导航栏结束-->
<!--巨幕-->
<div class=\"jumbotron masthead\">
<div class=\"container\">
<h1>文件上传下载</h1>
<h2>实现文件的上传和下载功能</h2>
<p class=\"masthead-button-links\">
<form class=\"form-inline\" onsubmit=\"return false;\">
<div class=\"form-group\">
<input type=\"search\" class=\"form-control keywords\" id=\"exampleInputName2\" placeholder=\"输入搜索内容\" name=\"keywords\" value=\"\">
<button class=\"btn btn-default searchBtn\" type=\"submit\">搜索</button>
<button type=\"button\" class=\"btn btn-primary btn-default\" data-toggle=\"modal\" data-target=\"#myModal\"> 上传 </button>
</div>
</form>
</p>
</div>
</div>
<!--巨幕结束-->
<!-- 模态框 -->
<div class=\"modal fade\" id=\"myModal\" tabindex=\"-1\" role=\"dialog\" aria-labelledby=\"myModalLabel\">
<div class=\"modal-dialog\" role=\"document\">
<form class=\"form-inline\" action=\"upload_class.php\" method=\"post\" enctype=\"multipart/form-data\">
<input type=\"hidden\" name=\"MAX_FILE_SIZE\" value=\"10240000\" />
<div class=\"modal-content\">
<div class=\"modal-header\">
<button type=\"button\" class=\"close\" data-dismiss=\"modal\" aria-label=\"Close\"><span aria-hidden=\"true\">×</span></button>
<h4 class=\"modal-title\" id=\"myModalLabel\">上传图片</h4>
</div>
<div class=\"modal-body\">
<p>选择图片：</p><input type=\"file\" id=\"image\" name=\"test_pic[]\">
<br/>
<p>图片描述：</p><textarea class=\"form-control\" cols=\"75\" name=\"description\" id=\"info\"></textarea>
<br/><br/>
<p>
是否添加水印：
<select name=\"mark\">
<option value=\"1\">添加</option>
<option value=\"0\">不添加</option>
</select>
</p>
<br/>
<p>
图片宽度比例：
<select name=\"scale\">
<option value=\"800*600\">800*600</option>
<option value=\"600*450\">600*450</option>
<option value=\"400*300\">400*300</option>
</select>
</p>
</div>
<div class=\"modal-footer\">
<button type=\"submit\" class=\"btn btn-default\" name=\"submit\" id=\"submit\" onclick=\"show(this)\">上传</button>
<button type=\"reset\" class=\"btn btn-primary\">重置</button>
</div>
</div>
</form>
</div>
</div>
<!--模态框结束-->
<div class=\"container projects\">
<div class=\"projects-header page-header\">
<h2>上传图片展示</h2>
<p>将上传的图片展示在页面中</p>
</div>
<div class=\"row pic_body\">
<!-- 使用js显示图片 -->
</div>
<!--分页-->
<nav aria-label=\"Page navigation\" style=\"text-align:center\">
<ul class=\"pagination pagination-lg\">
<!-- 使用js显示页码 -->
</ul>
</nav>
</div>
<footer class=\"footer container\">
<div class=\"row footer-bottom\">
<ul class=\"list-inline text-center\">
<h4><a href=\"class.test.com\" rel=\"external nofollow\" target=\"_blank\">class.test.com</a> | XX网</h4>
</ul>
</div>
</footer>
<!-- jQuery (necessary for Bootstrap\'s JavaScript plugins) -->
<script src=\"style/js/jquery.min.js\"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src=\"style/js/bootstrap.min.js\"></script>
<script type=\"text/JavaScript\">
function show(){
if(document.getElementById(\"image\").value == \'\'){
alert(\'请选择图片\');
}
if(document.getElementById(\"info\").value == \'\'){
alert(\'请输入图片描述\');
}
}
</script>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src=\"https://code.jquery.com/jquery-3.2.1.slim.min.js\" integrity=\"sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN\" crossorigin=\"anonymous\"></script>
<script src=\"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js\" integrity=\"sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q\" crossorigin=\"anonymous\"></script>
<script src=\"https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js\" integrity=\"sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl\" crossorigin=\"anonymous\"></script>
<script src=\"style/js/Ajax.js\"></script>
<script>
let pageNo = 1;
let kws = \'\';
let searchBtn = document.getElementsByClassName(\'searchBtn\')[0];
searchBtn.onclick = function() {
let search = document.getElementsByClassName(\'keywords\')[0];
let keywords = search.value;
requestData(pageNo, keywords);
kws = keywords;
};
let requestPage = function(page) {
requestData(page, kws);
pageNo = page;
};
let requestData = function(page_number, keywords) {
let pagination = document.getElementsByClassName(\'pagination\')[0];
let pic_body = document.getElementsByClassName(\'pic_body\')[0];
pic_body.innerHTML = \'<p style=\"text-align:center\"><i class=\"fa fa-spinner fa-spin\" style=\"font-size:24px\"></i> 加载中...</p>\';
$.get(\'search.php\', {\"page\": page_number, \"keywords\": keywords}, function (res) {
let divs = \'\';
if (res.code == 1) {
// 请求成功
res.rows.forEach(function (item) {
let div = \'<div class=\"col-sm-6 col-md-3 col-lg-4\"><div class=\"image\"><a href=\"\' + item.path + \'\" rel=\"external nofollow\" target=\"_blank\"><img class=\"img-responsive\" src=\"\' + item.path + \'\" ></a><div class=\"caption\"><p>\' + item.info + \'</p></div></div></div>\';
divs += div;
});
pic_body.innerHTML = divs;
// 加载页码导航
// previous
let previousBtn = \'\';
if (res.page_number == 1) {
previousBtn = \'<li class=\"page-item disabled\"><a class=\"page-link\" href=\"javascript:requestPage(\' + (res.page_number - 1) + \');\" rel=\"external nofollow\" rel=\"external nofollow\" >Previous</a></li>\';
} else {
previousBtn = \'<li class=\"page-item\"><a class=\"page-link\" href=\"javascript:requestPage(\' + (res.page_number - 1) + \');\" rel=\"external nofollow\" rel=\"external nofollow\" >Previous</a></li>\';
}
// next
let nextBtn = \'\';
if (res.page_total == res.page_number) {
nextBtn = \'<li class=\"page-item disabled\"><a class=\"page-link\" href=\"javascript:requestPage(\' + (res.page_number + 1) + \');\" rel=\"external nofollow\" rel=\"external nofollow\" >Next</a></li>\';
} else {
nextBtn = \'<li class=\"page-item\"><a class=\"page-link\" href=\"javascript:requestPage(\' + (res.page_number + 1) + \');\" rel=\"external nofollow\" rel=\"external nofollow\" >Next</a></li>\'
}
let pages = previousBtn;
for (let page = 1; page <= res.page_total; page++) {
let active = \'\';
if (page == res.page_number) {
active = \'active\';
}
pages += \'<li class=\"page-item \' + active + \'\"><a class=\"page-link\" href=\"javascript:requestPage(\' + page + \');\" rel=\"external nofollow\" >\' + page + \'</a></li>\';
}
pages += nextBtn;
pagination.innerHTML = pages;
}
},\'json\');
};
requestData(1, \'\');
</script>
</body>
</html>
2.图片相关功能处理
upload_class.php
<?php
//接收传过来的数据
$description=$_POST[\'description\'];//描述
$mark=$_POST[\'mark\'];//水印
$scale=$_POST[\'scale\'];//比例 800*600
$path=\'\';//图片存储路径
//根据比例获取宽高
$width=substr($scale,0,3);//800
$height=substr($scale,4,3);//600
//上传图片并存储
require(\'UploadFile.php\');
$upload = new UploadFile(\'test_pic\');
$upload->setDestinationDir(\'./uploads\');
$upload->setAllowMime([\'image/jpeg\', \'image/gif\',\'image/png\']);
$upload->setAllowExt([\'gif\', \'jpeg\',\'jpg\',\'png\']);
$upload->setAllowSize(2*1024*1024);
if ($upload->upload()) {
$filename=$upload->getFileName()[0];
$dir=$upload->getDestinationDir();
$path=$dir.\'/\'.$filename;//图片存储的实际路径
} else {
var_dump($upload->getErrors());
}
//根据比例调整图像
require_once \'./lib/Image.php\';
$image = new \\test\\Lib\\Image($path);
//放大并保存
$image->resize($width,$height)->save($path);
$info = getimagesize($path);
//根据不同的图像type 来创建图像
switch($info[2])
{
case 1://IMAGETYPE_GIF
$image = imagecreatefromgif($path);
break;
case IMAGETYPE_JPEG:
$image = imagecreatefromjpeg($path);
break;
case 3:
$image = imagecreatefrompng($path);
break;
default:
echo \'图像格式不支持\';
break;
}
//添加水印
if($mark==1){
$logo=imagecreatefrompng(\'./uploads/logo.png\');
//添加水印
imagecopy($image,$logo,0,0,0,0,imagesx($logo),imagesy($logo));
//header(\'Content-type:image/png\');
imagejpeg($image,$path);
}
$dst_image=imagecreatetruecolor($width,$height);
//拷贝源图像左上角起始
imagecopy( $dst_image, $image, 0, 0, 0, 0, $width, $height );
imagejpeg($dst_image,$path);
//存入数据库
$servername = \"localhost\";
$username = \"root\";
$password = \"123456\";
$dbname = \"pic\";
try {
$conn = new PDO(\"mysql:host=$servername;dbname=$dbname\", $username, $password);
// 设置 PDO 错误模式，用于抛出异常
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = \"INSERT INTO pic(`path`, `mark`, `scale`,`info`)
VALUES (\'$path\', \'$mark\', \'$scale\',\'$description\')\";
// 使用 exec() ，没有结果返回
$conn->exec($sql);
exit(\"<script>alert(\\\"图片上传成功!\\\");window.location=\\\"index.php\\\";</script>\");
}
catch(PDOException $e)
{
echo $sql . \"<br>\" . $e->getMessage();
}
3.封装好的文件上传类
UploadFile.php
<?php
/**
* Created by PhpStorm.
* User: JasonLee
* Date: 2018/11/11
* Time: 22:01
*/
class UploadFile
{
/**
*
*/
const UPLOAD_ERROR = [
UPLOAD_ERR_INI_SIZE => \'文件大小超出了php.ini当中的upload_max_filesize的值\',
UPLOAD_ERR_FORM_SIZE => \'文件大小超出了MAX_FILE_SIZE的值\',
UPLOAD_ERR_PARTIAL => \'文件只有部分被上传\',
UPLOAD_ERR_NO_FILE => \'没有文件被上传\',
UPLOAD_ERR_NO_TMP_DIR => \'找不到临时目录\',
UPLOAD_ERR_CANT_WRITE => \'写入磁盘失败\',
UPLOAD_ERR_EXTENSION => \'文件上传被扩展阻止\',
];
/**
* @var
*/
protected $field_name;
/**
* @var string
*/
protected $destination_dir;
/**
* @var array
*/
protected $allow_mime;
/**
* @var array
*/
protected $allow_ext;
/**
* @var
*/
protected $file_org_name;
/**
* @var
*/
protected $file_type;
/**
* @var
*/
protected $file_tmp_name;
/**
* @var
*/
protected $file_error;
/**
* @var
*/
protected $file_size;
/**
* @var array
*/
protected $errors;
/**
* @var
*/
protected $extension;
/**
* @var
*/
protected $file_new_name;
/**
* @var float|int
*/
protected $allow_size;
/**
* UploadFile constructor.
* @param $keyName
* @param string $destinationDir
* @param array $allowMime
* @param array $allowExt
* @param float|int $allowSize
*/
public function __construct($keyName, $destinationDir = \'./uploads\', $allowMime = [\'image/jpeg\', \'image/gif\'], $allowExt = [\'gif\', \'jpeg\'], $allowSize = 2*1024*1024)
{
$this->field_name = $keyName;
$this->destination_dir = $destinationDir;
$this->allow_mime = $allowMime;
$this->allow_ext = $allowExt;
$this->allow_size = $allowSize;
}
/**
* @param $destinationDir
*/
public function setDestinationDir($destinationDir)
{
$this->destination_dir = $destinationDir;
}
/**
* @param $allowMime
*/
public function setAllowMime($allowMime)
{
$this->allow_mime = $allowMime;
}
/**
* @param $allowExt
*/
public function setAllowExt($allowExt)
{
$this->allow_ext = $allowExt;
}
/**
* @param $allowSize
*/
public function setAllowSize($allowSize)
{
$this->allow_size = $allowSize;
}
/**
* @return bool
*/
public function upload()
{
// 判断是否为多文件上传
$files = [];
if (is_array($_FILES[$this->field_name][\'name\'])) {
foreach($_FILES[$this->field_name][\'name\'] as $k => $v) {
$files[$k][\'name\'] = $v;
$files[$k][\'type\'] = $_FILES[$this->field_name][\'type\'][$k];
$files[$k][\'tmp_name\'] = $_FILES[$this->field_name][\'tmp_name\'][$k];
$files[$k][\'error\'] = $_FILES[$this->field_name][\'error\'][$k];
$files[$k][\'size\'] = $_FILES[$this->field_name][\'size\'][$k];
}
} else {
$files[] = $_FILES[$this->field_name];
}
foreach($files as $key => $file) {
// 接收$_FILES参数
$this->setFileInfo($key, $file);
// 检查错误
$this->checkError($key);
// 检查MIME类型
$this->checkMime($key);
// 检查扩展名
$this->checkExt($key);
// 检查文件大小
$this->checkSize($key);
// 生成新的文件名称
$this->generateNewName($key);
if (count((array)$this->getError($key)) > 0) {
continue;
}
// 移动文件
$this->moveFile($key);
}
if (count((array)$this->errors) > 0) {
return false;
}
return true;
}
/**
* @return array
*/
public function getErrors()
{
return $this->errors;
}
/**
* @param $key
* @return mixed
*/
protected function getError($key)
{
return $this->errors[$key];
}
/**
*
*/
protected function setFileInfo($key, $file)
{
// $_FILES name type temp_name error size
$this->file_org_name[$key] = $file[\'name\'];
$this->file_type[$key] = $file[\'type\'];
$this->file_tmp_name[$key] = $file[\'tmp_name\'];
$this->file_error[$key] = $file[\'error\'];
$this->file_size[$key] = $file[\'size\'];
}
/**
* @param $key
* @param $error
*/
protected function setError($key, $error)
{
$this->errors[$key][] = $error;
}
/**
* @param $key
* @return bool
*/
protected function checkError($key)
{
if ($this->file_error > UPLOAD_ERR_OK) {
switch($this->file_error) {
case UPLOAD_ERR_INI_SIZE:
case UPLOAD_ERR_FORM_SIZE:
case UPLOAD_ERR_PARTIAL:
case UPLOAD_ERR_NO_FILE:
case UPLOAD_ERR_NO_TMP_DIR:
case UPLOAD_ERR_CANT_WRITE:
case UPLOAD_ERR_EXTENSION:
$this->setError($key, self::UPLOAD_ERROR[$this->file_error]);
return false;
}
}
return true;
}
/**
* @param $key
* @return bool
*/
protected function checkMime($key)
{
if (!in_array($this->file_type[$key], $this->allow_mime)) {
$this->setError($key, \'文件类型\' . $this->file_type[$key] . \'不被允许!\');
return false;
}
return true;
}
/**
* @param $key
* @return bool
*/
protected function checkExt($key)
{
$this->extension[$key] = pathinfo($this->file_org_name[$key], PATHINFO_EXTENSION);
if (!in_array($this->extension[$key], $this->allow_ext)) {
$this->setError($key, \'文件扩展名\' . $this->extension[$key] . \'不被允许！\');
return false;
}
return true;
}
/**
* @return bool
*/
protected function checkSize($key)
{
if ($this->file_size[$key] > $this->allow_size) {
$this->setError($key, \'文件大小\' . $this->file_size[$key] . \'超出了限定大小\' . $this->allow_size);
return false;
}
return true;
}
/**
* @param $key
*/
protected function generateNewName($key)
{
$this->file_new_name[$key] = uniqid() . \'.\' . $this->extension[$key];
}
/**
* @param $key
* @return bool
*/
protected function moveFile($key)
{
if (!file_exists($this->destination_dir)) {
mkdir($this->destination_dir, 0777, true);
}
$newName = rtrim($this->destination_dir, \'/\') . \'/\' . $this->file_new_name[$key];
if (is_uploaded_file($this->file_tmp_name[$key]) && move_uploaded_file($this->file_tmp_name[$key], $newName)) {
return true;
}
$this->setError($key, \'上传失败！\');
return false;
}
/**
* @return mixed
*/
public function getFileName()
{
return $this->file_new_name;
}
/**
* @return string
*/
public function getDestinationDir()
{
return $this->destination_dir;
}
/**
* @return mixed
*/
public function getExtension()
{
return $this->extension;
}
/**
* @return mixed
*/
public function getFileSize()
{
return $this->file_size;
}
}
4.搜索功能实现
search.php
<?php
// 接收请求数据
$pageNo = $_GET[\'page\'] ?? 1;
$pageSize = 9;
// 接收查询参数
$keywords = $_GET[\'keywords\'] ?? \'\';
$data = [];
//模拟加载中的图标sleep(3);
try {
$pdo = new PDO(\'mysql:host=localhost:3306;dbname=pic\',
\'root\',
\'123456\',
[PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]
);
// 请求mysql 查询记录总数
$sql = \'SELECT count(*) AS aggregate FROM pic\';
if (strlen($keywords) > 0) {
$sql .= \' WHERE info like ?\';
}
$stmt = $pdo->prepare($sql);
if (strlen($keywords) > 0) {
$stmt->bindValue(1, \'%\' . $keywords . \'%\', PDO::PARAM_STR);
}
$stmt->execute();
$total = $stmt->fetch(PDO::FETCH_ASSOC)[\'aggregate\'];
// 计算最大页码，设置页码边界
$minPage = 1;
$maxPage = ceil($total / $pageSize); // 3.6
$pageNo = max($pageNo, $minPage);
$pageNo = min($pageNo, $maxPage);
$offset = ($pageNo - 1) * $pageSize;
$sql=\"SELECT `path`,`info` FROM pic \";
if (strlen($keywords) > 0) {
$sql .= \' WHERE info like ?\';
}
$sql .= \'ORDER BY id DESC LIMIT ?, ?\';
$stmt = $pdo->prepare($sql);
if (strlen($keywords) > 0) {
$stmt->bindValue(1, \'%\' . $keywords . \'%\', PDO::PARAM_STR);
$stmt->bindValue(2, (int)$offset, PDO::PARAM_INT);
$stmt->bindValue(3, (int)$pageSize, PDO::PARAM_INT);
} else {
$stmt->bindValue(1, (int)$offset, PDO::PARAM_INT);
$stmt->bindValue(2, (int)$pageSize, PDO::PARAM_INT);
}
$stmt->execute();
$results = $stmt->fetchAll(PDO::FETCH_ASSOC);
$data = [
\'code\' => 1,
\'msg\' => \'ok\',
\'rows\' => $results,
\'total_records\' => (int)$total,
\'page_number\' => (int)$pageNo,
\'page_size\' => (int)$pageSize,
\'page_total\' => (int)$maxPage,
];
} catch (PDOException $e) {
$data = [
\'code\' => 0,
\'msg\' => $e->getMessage(),
\'rows\' => [],
\'total_records\' => 0,
\'page_number\' => 0,
\'page_size\' => (int)$pageSize,
\'page_total\' => 0,
];
}
header(\'Content-type: application/json\');
echo json_encode($data);
4.最后数据库格式
/* Navicat MySQL Data Transfer Source Server : localhost Source Server Version : 80012 Source Host : localhost:3306 Source Database : pic Target Server Type : MYSQL Target Server Version : 80012 File Encoding : 65001 Date: 2020-01-14 16:22:49 */ SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for pic -- ---------------------------- DROP TABLE IF EXISTS `pic`; CREATE TABLE `pic` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `path` varchar(255) DEFAULT NULL, `mark` tinyint(3) DEFAULT NULL, `scale` varchar(255) DEFAULT NULL, `info` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=3 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of pic -- ---------------------------- INSERT INTO `pic` VALUES (\'1\', \'./uploads/5e1d788084cc5.jpg\', \'1\', \'800*600\', \'这是测试图片1\'); INSERT INTO `pic` VALUES (\'2\', \'./uploads/5e1d789766591.jpg\', \'1\',
以上就是PHP实现文件上传和下载的示例代码的详细内容，更多关于PHP文件上传下载的资料请关注其它相关文章！
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