How to convert php images to binary

How to convert php images to binary: 1. Read the open file through the fread function; 2. Read the image through the file_get_contents function and convert it to binary data.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

php method of converting images to binary data

Method 1:

php fread() function reads the open file (binary method)

Sample code:

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<?php
$img  = &#39;feiniaomy.jpg&#39;; // 图片的存放在地址
$fp   = fopen($img, &#39;rb&#39;); // 打开图片
$content = fread($fp, filesize($img));//二进制数据
echo $content; //输出二进制数据
//这里输出到浏览器的是乱码
?>

Method 2:

php file_get_contents() Read the image and convert it into binary data

Sample code:

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<?php
$img = &#39;xx.jpg&#39;; //图片的地址
echo file_get_contents($img);
//这里输出到浏览器的是乱码
?>

php Method of outputting binary images

php To output binary images to the browser, you only need to add a header to declare the image type!

Example:

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<?php
//声明为图片类型，发送header头
header( "Content-type: image/jpeg");
$img = &#39;xx.jpg&#39;;
$size = filesize($img );
$fp= fopen($img, &#39;r&#39;);
$data = fread($fp, $size);//二进制数据
echo $data; //输出图片的二进制数据
?>

Note:

The header sent depends on the specific situation, not necessarily all image/ jpeg. Images in JPG format are image/jpeg, but images in PNG format may need to be declared as image/png. Individuals should test this in actual applications.

Recommended learning: "PHP Video Tutorial"

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