Generally, the traditional way we upload pictures is to save the pictures in the local folder of the server. Here I will briefly introduce the method of storing pictures directly into the database.
Mysql database provides the Blob type for storing large amounts of data. There are four types of BLOB that can accommodate data of different sizes.
TinyBlob Maximum 255B
Blob Maximum 65K
MediumBlob Maximum 16M
LongBlob Maximum 4G
It should be noted that the PHP configuration file itself has a size limit for post form data and a size limit for file submission. Therefore, you need to modify php.ini
upload_max_filesize=10M (file submission file size limit)
##post_max_size=10M (form data size limit)
I use php to make a simple registration example. The design of mysql table (field naming is a bit irregular, you need to pay attention to the field naming specifications in actual projects)Database connection file conn. php
$conn = @mysql_connect('localhost' , 'userName' , 'passWord') or die(mysql_error()); //连接数据库 mysql_query('set names utf8' , $conn); //设置连接字符集 @mysql_select_db('user' , $conn) or die(mysql_error()); //连接数据表
Registration form implementation register.html (select key parts)
<form action="register.php" method="post" enctype="multipart/form-data"> <dl class="admin_login"> <dd class="pic"> <img src="/static/imghwm/default1.png" data-src="img/5.png" class="lazy" alt="" id="preview"/> <a href="javascript:;" class="a-upload"> <input type="file" name="photo" id="" οnchange="imgPreview(this)">上传头像 </a> </dd> <dd class="email_icon"> <input type="text" placeholder="请输入注册邮箱" name="email" class="login_txtbx"> </dd> <dd class="name_icon"> <input type="text" placeholder="请输入帐号昵称" name="name" class="login_txtbx"> </dd> <dd class="phone_icon"> <input type="tel" placeholder="请输入联系号码" name="phone" class="login_txtbx"> </dd> <dd class="school_icon"> <select name="school"> <option value="0">请选择报研学校</option> <option value="1">中南大学</option> <option value="2">电子科技大学</option> <option value="3">上海交通大学</option> <option value="4">华南理工大学</option> </select> </dd> <dd class="pwd_icon"> <input type="password" placeholder="请输入您的密码" name="password" class="login_txtbx"> </dd> <dd class="rpwd_icon"> <input type="password" placeholder="请确认您的密码" class="login_txtbx"> </dd> <dd> <input type="submit" value="立即注册" class="submit_btn"> </dd> </dl> </form>
Upload pictures and registration page register.php
<?php require('conn.php'); if(empty($_POST)){ require('register.html'); }else{ $image = mysql_real_escape_string(file_get_contents($_FILES['photo']['tmp_name'])); //获取图片 $image_type = $_FILES['photo']['type']; //获取图片格式 $user_name = $_POST['name']; $user_email = $_POST['email']; $user_phone = $_POST['phone']; $user_school = $_POST['school']; $password = $_POST['password']; $sqlstr = "insert into user(uname,email,phone,password,school,photo,type) values('".$user_name."','".$user_email."','".$user_phone."','".$password."','".$user_school."','".$image."','".$image_type."')"; @mysql_query($sqlstr) or die(mysql_error()); //执行sql语句,若执行成功,继续下面跳转页面。若执行失败,提示错误信息 header('location:login.php'); //跳转页面 exit(); } ?>Things to note:
1) PHP configuration file size limit
2) When uploading files using form, be sure to Add the attribute content enctype="multipart/form-data", otherwise an exception will be reported when using $_FILES[ 'photo' ] [ ' tmp_name' ] to obtain file information
Recommended tutorial:The above is the detailed content of How to upload pictures to database in php. For more information, please follow other related articles on the PHP Chinese website!

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。


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