How to convert image to binary string in php?

php method to convert an image into a binary string: first use filesize() to get the size of the image file and assign it to the variable $PSize; then use fopen() to open the image file and assign it to the variable $fp; finally use "fread($fp,$PSize)" reads the file and converts it into binary string data.

php method to convert image files into binary output

header( "Content-type: image/jpeg");
$PSize = filesize('1.jpg');
$fp =fopen('1.jpg', "rb");
$picturedata = fread($fp, $PSize);//二进制数据
echo $picturedata;

It’s that simple With 5 lines of code, the image is output to the client in the form of a binary stream, which is no different from opening a picture.

It should be noted here that the header sent depends on the specific situation and may not always be image/jpeg. JPG is image/jpeg, but PNG is image/png. Different types of pictures output different headers.

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