Home php教程 php手册 用PHP实现把图象上传到数据库

用PHP实现把图象上传到数据库

Jun 21, 2016 am 08:58 AM
file img mysql php

上传|数据|数据库

  有什么问题请与我联系:http://www.webjx.com web@webjx.com
 转载请注明出处

  今天教给大家如何用PHP实现把图象上传到MYSQL数据库中。 在这个教程中我们需要建立3个PHP文件:

  readdir.php - 把图片放到数据库的代码
  image.php - 显示实际图片的代码
  view.php - 显示你如何调用数据库中的图片的代码

1.创建一个数据库

CREATE TABLE `images` (
`imgid` INT NOT NULL AUTO_INCREMENT ,
`sixfourdata` LONGTEXT NOT NULL ,
PRIMARY KEY ( `imgid` )
);
READDIR.PHP

具体的内容:

$dbcnx = mysql_connect("localhost", "username", "password");
mysql_select_db("base64imgdb");
?>
'我们需要打开一个目录
"./"
'readdir.php 文件定位于这个目录:
$path = "./";
$dir_handle = opendir($path) or die("Unable to open directory $path");

  下面是比较难的部分,大家需要好好研究一下:把图象分类,并且读出正在使用的一些数据

fopen

'转换

base64_encode

' 插入到表里


while ($file = readdir($dir_handle)) {
$filetyp = substr($file, -3);
if ($filetyp == 'gif' OR $filetyp == 'jpg') {
$handle = fopen($path . "/" . $file,'r');
$file_content = fread($handle,filesize($path . "/" . $file));
fclose($handle);
$encoded = chunk_split(base64_encode($file_content));
$sql = "INSERT INTO images SET sixfourdata='$encoded'";
mysql_query($sql);
}
}
?>

  关闭设置的目录,然后处理:


closedir($dir_handle);
echo("complete");
mysql_close($dbcnx);
?>

  读出图片的代码:IMAGE.PHP
  这段代码比较难,我们要好好看看


$dbcnx = mysql_connect("localhost", "username", "password");
mysql_select_db("base64imgdb");
?>
我们读出图片使用的代码image.php?img=x:

$img = $_REQUEST["img"];
?>
之后我们需要连接数据库,然后读出

$result = mysql_query("SELECT * FROM images WHERE imgid=" . $img . "");
if (!$result) {
echo("请求错误: " . mysql_error() . "");
exit();
}
while ($row = mysql_fetch_array($result)) {
$imgid = $row["imgid"];
$encodeddata = $row["sixfourdata"];
}
?>


mysql_close($dbcnx);
echo base64_decode($encodeddata);
?>

  在这里我们要理解base64-encoded 图象数据格式。

  "让我们来看看具体的图片吧!" VIEW.PHP

image.php?img=1

image.php?img=357



看看完整的一个例子吧!

readdir.php:

###############################
# DB CONNECTION
# CHANGE THESE VALUES
###############################
$dbcnx = mysql_connect("localhost", "username", "password");
mysql_select_db("base64imgdb");

$path = "./";
$dir_handle = opendir($path) or die("Unable to open directory $path");
while ($file = readdir($dir_handle)) {
$filetyp = substr($file, -3);
if ($filetyp == 'gif' OR $filetyp == 'jpg') {
$handle = fopen($file,'r');
$file_content = fread($handle,filesize($file));
fclose($handle);
$encoded = chunk_split(base64_encode($file_content));
$sql = "INSERT INTO images SET sixfourdata='$encoded'";
mysql_query($sql);
}
}

closedir($dir_handle);
echo("complete");
mysql_close($dbcnx);
?>
image.php:

$dbcnx = mysql_connect("localhost", "username", "password");

mysql_select_db("base64imgdb");

$img = $_REQUEST["img"];

$result = mysql_query("SELECT * FROM images WHERE imgid=" . $img . "");

if (!$result) {

echo("Error performing query: " . mysql_error() . "");
exit();
}
while ($row = mysql_fetch_array($result) ) {
$imgid = $row["imgid"];
$encodeddata = $row["sixfourdata"];
}
mysql_close($dbcnx);
echo base64_decode($encodeddata);
?>
And view.php (i shouldnt need to post this..)


..

..




Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP and Python: Different Paradigms Explained PHP and Python: Different Paradigms Explained Apr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

Choosing Between PHP and Python: A Guide Choosing Between PHP and Python: A Guide Apr 18, 2025 am 12:24 AM

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP and Python: A Deep Dive into Their History PHP and Python: A Deep Dive into Their History Apr 18, 2025 am 12:25 AM

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

Laravel Introduction Example Laravel Introduction Example Apr 18, 2025 pm 12:45 PM

Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.

Solve database connection problem: a practical case of using minii/db library Solve database connection problem: a practical case of using minii/db library Apr 18, 2025 am 07:09 AM

I encountered a tricky problem when developing a small application: the need to quickly integrate a lightweight database operation library. After trying multiple libraries, I found that they either have too much functionality or are not very compatible. Eventually, I found minii/db, a simplified version based on Yii2 that solved my problem perfectly.

The Continued Use of PHP: Reasons for Its Endurance The Continued Use of PHP: Reasons for Its Endurance Apr 19, 2025 am 12:23 AM

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

Laravel framework installation method Laravel framework installation method Apr 18, 2025 pm 12:54 PM

Article summary: This article provides detailed step-by-step instructions to guide readers on how to easily install the Laravel framework. Laravel is a powerful PHP framework that speeds up the development process of web applications. This tutorial covers the installation process from system requirements to configuring databases and setting up routing. By following these steps, readers can quickly and efficiently lay a solid foundation for their Laravel project.

MySQL and phpMyAdmin: Core Features and Functions MySQL and phpMyAdmin: Core Features and Functions Apr 22, 2025 am 12:12 AM

MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.

See all articles