php method to implement the image upload function: first create a folder to store images; then create the HTML part; then create the "uploadHandler.php" file; finally compare the image format of the file with the elements in the array and Just upload it.
Recommended: "PHP Video Tutorial"
Image upload operation in PHP
In front-end programming, sometimes we need to allow viewers to upload a certain picture. We can implement this function through PHP.
1. Create a folder to store pictures
Here, we create the folder "file" to store the pictures uploaded by the user. At this time, the folder is empty, and the folder creation address can be It's your choice, but it's best to build it in a location that's easily accessible.
2. Create the HTML part (uploadfile.html)
Here we use the form form tag of HTML, and the
<input type="file">来选择图片文件 <input type="submit">来提交图片相关信息
code in the form is as follows:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <form action="uploadHandler.php" method="post" enctype="multipart/form-data"> Upload Img:<input type="file" name="img"/> <input type="submit" value="Upload"/> </form> </body> </html>
Note:
1. The action in the form is connected to the .php file that will be created later to handle image upload.
2. Enctype="multipart/form-data" must be noted in the attribute of form. The enctype attribute specifies how form data is encoded before sending it to the server. multipart/form-data does not encode characters. This value is required when using a form with a file upload control.
3. Here, we are using the post method.
3. Create the PHP part (uploadHandler.php)
1. Principle
We create a php file and only enter
<?php var_dump($_FILES); ?>
Then we A corresponding array arr(1) will be printed.
The array structure of ar h(1) is:
array(1) {
["img"]=> array(5) {
["name"]=> string(**) "AAAAAAA.jpg" // 图片名
["type"]=> string(10) "image/jpeg" // 图片格式
["tmp_name"]=> string(45) "/Applications/XAMPP/xamppfiles/temp/phpVZQY0m" // 图片缓存地址
["error"]=> int(0) // 上传图片错误数
["size"]=> int(124246) // 图片大小
}
}There is an element ["img"] under the array array, and under ["img"] is a two-dimensional array. This The two-dimensional array has five elements, namely: name / type / tmp_name / error / size.
# ## Through these attributes, we get the basic information of a picture. The next step is to save the picture into a folder by judging these basic attributes. 2. Actual operation Make the following judgment: error [Yes]: Prompt error ❌error [No]: Next step✅## ˆ ˆ╙type[non-img]: Prompt error ❌
˜ˆ ˆ ˆ╙type[img]: Next step ✅
ˆ ˆ ˆ╙type[non-jpeg]: Prompt error ❌
ˆ ˆ ˆ╙type[jpeg]: Next step ✅
ˆ ˆ If the above judgments are met, then we think this picture can be saved.
To avoid duplication of picture naming, we use the concept of timestamps to splice them into a new file name so that each picture is uniquely named.
And we can create an array, the elements in the array are various image formats, compare the image format of the file with the elements in the array, if the image format is not recognized by us, it will not be saved.
The code is as follows:
<?php
// 接收文件
var_dump($_FILES); // 区别于$_POST、$_GET
print_r($_FILES);
$file = $_FILES["img"];
// 先判断有没有错
if ($file["error"] == 0) {
// 成功
// 判断传输的文件是否是图片，类型是否合适
// 获取传输的文件类型
$typeArr = explode("/", $file["type"]);
if($typeArr[0]== "image"){
// 如果是图片类型
$imgType = array("png","jpg","jpeg");
if(in_array($typeArr[1], $imgType)){ // 图片格式是数组中的一个
// 类型检查无误，保存到文件夹内
// 给图片定一个新名字 (使用时间戳，防止重复)
$imgname = "file/".time().".".$typeArr[1];
// 将上传的文件写入到文件夹中
// 参数1: 图片在服务器缓存的地址
// 参数2: 图片的目的地址（最终保存的位置）
// 最终会有一个布尔返回值
$bol = move_uploaded_file($file["tmp_name"], $imgname);
if($bol){
echo "上传成功！";
} else {
echo "上传失败！";
};
};
} else {
// 不是图片类型
echo "没有图片，再检查一下吧！";
};
} else {
// 失败
echo $file["error"];
};
?>4. Upload pictures
At this point, if everything meets the requirements, then the pictures we uploaded will be stored in the file folder. . Upload successful!
The above is the detailed content of How to implement image upload function in php. For more information, please follow other related articles on the PHP Chinese website!
php怎么把负数转为正整数Apr 19, 2022 pm 08:59 PMphp把负数转为正整数的方法：1、使用abs()函数将负数转为正数，使用intval()函数对正数取整，转为正整数，语法“intval(abs($number))”；2、利用“~”位运算符将负数取反加一，语法“~$number + 1”。
php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM实现方法：1、使用“sleep(延迟秒数)”语句，可延迟执行函数若干秒；2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句，可延迟执行函数若干秒和纳秒；3、使用“time_sleep_until(time()+7)”语句。
php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PMphp除以100保留两位小数的方法：1、利用“/”运算符进行除法运算，语法“数值 / 100”；2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值，并保留两位小数。
php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM判断方法：1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式；2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的，因此真实天数需要在此基础上加1。
php字符串有没有下标Apr 24, 2022 am 11:49 AMphp字符串有下标。在PHP中，下标不仅可以应用于数组和对象，还可应用于字符串，利用字符串的下标和中括号“[]”可以访问指定索引位置的字符，并对该字符进行读写，语法“字符串名[下标值]”；字符串的下标值（索引值）只能是整数类型，起始值为0。
php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM方法：1、用“str_replace(" ","其他字符",$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怎么读取字符串后几个字符Apr 22, 2022 pm 08:31 PM在php中，可以使用substr()函数来读取字符串后几个字符，只需要将该函数的第二个参数设置为负值，第三个参数省略即可；语法为“substr(字符串,-n)”，表示读取从字符串结尾处向前数第n个字符开始，直到字符串结尾的全部字符。
php怎么判断有没有小数点Apr 20, 2022 pm 08:12 PMphp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。
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
SublimeText3 Mac version
God-level code editing software (SublimeText3)
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
Atom editor mac version download
The most popular open source editor
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),
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
