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.