Using PHP fread() to Read Files: Syntax, Parameters, Return Values, and Practical Examples

The fread() function reads up to a specified number of bytes from an open file pointer in PHP and can safely handle binary files.

Syntax: string fread(resource $handle, int $length)

Reading stops when either the requested $length bytes have been read or the end of the file (EOF) is reached.

Parameters :

handle – a file system pointer, typically obtained from fopen() .

length – the maximum number of bytes to read.

Return value – the read string on success, or FALSE on failure.

Example 1 – Read a regular text file:

<?php $filename = "/usr/local/something.txt"; $handle = fopen($filename, "r"); $contents = fread($handle, filesize($filename)); fclose($handle); ?>

Example 2 – Read a binary file (e.g., an image):

<?php $filename = "c:\\files\\somepic.gif"; $handle = fopen($filename, "rb"); $contents = fread($handle, filesize($filename)); fclose($handle); ?>

Example 3 – Stream data from a URL using a loop:

<?php $handle = fopen("http://www.example.com/", "rb"); $contents = ''; while (!feof($handle)) { $contents .= fread($handle, 8192); } fclose($handle); ?>

These examples demonstrate how fread() can be used for different file types and streaming scenarios in backend PHP development.