本文实例讲述了php上传图片类及用法。分享给大家供大家参考,具体如下:
1.类文件名为:upclass.php
<?php class upclass{ public $previewsize=0.125 ; //预览图片比例 public $preview=0; //是否生成预览,是为1,否为0 public $datetime; //随机数 public $ph_name; //上传图片文件名 public $ph_tmp_name; //图片临时文件名 public $ph_path="./userimg/"; //上传文件存放路径 public $ph_type; //图片类型 public $ph_size; //图片大小 public $imgsize; //上传图片尺寸,用于判断显示比例 public $al_ph_type=array('image/jpg','image/jpeg','image/png','image/pjpeg','image/gif','image/bmp','image/x-png'); //允许上传图片类型 public $al_ph_size=1000000; //允许上传文件大小 function __construct(){ $this->set_datatime(); } function set_datatime(){ $this->datetime=date("YmdHis"); } //获取文件类型 function get_ph_type($phtype){ $this->ph_type=$phtype; } //获取文件大小 function get_ph_size($phsize){ $this->ph_size=$phsize."<br>"; } //获取上传临时文件名 function get_ph_tmpname($tmp_name){ $this->ph_tmp_name=$tmp_name; $this->imgsize=getimagesize($tmp_name); } //获取原文件名 function get_ph_name($phname){ $this->ph_name=$this->ph_path.$this->datetime.strrchr($phname,"."); //strrchr获取文件的点最后一次出现的位置 //$this->ph_name=$this->datetime.strrchr($phname,"."); //strrchr获取文件的点最后一次出现的位置 return $this->ph_name; } // 判断上传文件存放目录 function check_path(){ if(!file_exists($this->ph_path)){ mkdir($this->ph_path); } } //判断上传文件是否超过允许大小 function check_size(){ if($this->ph_size>$this->al_ph_size){ $this->showerror("上传图片超过2000KB"); } } //判断文件类型 function check_type(){ if(!in_array($this->ph_type,$this->al_ph_type)){ $this->showerror("上传图片类型错误"); } } //上传图片 function up_photo(){ if(!move_uploaded_file($this->ph_tmp_name,$this->ph_name)){ $this->showerror("上传文件出错"); } } //图片预览 function showphoto(){ if($this->preview==1){ if($this->imgsize[0]>2000){ $this->imgsize[0]=$this->imgsize[0]*$this->previewsize; $this->imgsize[1]=$this->imgsize[1]*$this->previewsize; } echo("<img src=\"{$this- alt="php上传图片类及用法示例_PHP" >ph_name}\" width=\"{$this->imgsize['0']}\" height=\"{$this->imgsize['1']}\">"); } } //错误提示 function showerror($errorstr){ echo "<script language=javascript>alert('$errorstr');location='javascript:history.go(-1)';</script>"; exit(); } function save(){ $this->check_path(); $this->check_size(); $this->check_type(); $this->up_photo(); $this->showphoto(); } } ?>
2.html页面:
<form action="upphoto.php" method="post" enctype="multipart/form-data"> 图片来源:<input type="file" name="photo" id="photo"> <input type="submit" name="submit" value="上传"> </form>
3.调用类的文件名为:upphoto.php
<?php header("Content-Type:text/html; charset=utf-8"); //类的实例化: include("upclass.php");//类的文件名是upoop.php $up=new upclass(); $submit=$_POST['submit']; if($submit=="上传"){ $up->get_ph_tmpname($_FILES['photo']['tmp_name']); $up->get_ph_type($_FILES['photo']['type']); $up->get_ph_size($_FILES['photo']['size']); $up->get_ph_name($_FILES['photo']['name']); $up->save(); } ?> <?php $images=$up->get_ph_name($_FILES['photo']['name']); echo "<img src='$images' / alt="php上传图片类及用法示例_PHP" >"; ?>
更多关于PHP相关内容感兴趣的读者可查看本站专题:《php文件操作总结》、《PHP运算与运算符用法总结》、《PHP网络编程技巧总结》、《PHP基本语法入门教程》、《php操作office文档技巧总结(包括word,excel,access,ppt)》、《php日期与时间用法总结》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》
希望本文所述对大家PHP程序设计有所帮助。

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

WebStorm Mac version
Useful JavaScript development tools

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool