Using PHP fread() to Read Files: Syntax, Parameters, and Example

PHP is a widely used scripting language for web development, and it provides many built‑in functions for file handling, including the fread() function.

Syntax: <code>string fread(resource $handle, int $length)</code>

Parameters: $handle: an opened file pointer obtained from fopen() . $length: the number of bytes to read; you can specify an exact size or a variable value such as "1K". $offset (optional): the position in the file where reading should start.

Return value: the function returns the read bytes as a string, or false on error.

Example usage:

<code>&lt;?php<br/>// Open file<br/>$handle = fopen('example.txt', 'r');<br/><br/>// Check if the file was opened successfully<br/>if ($handle) {<br/>    // Read file contents<br/>    $content = fread($handle, filesize('example.txt'));<br/><br/>    // Output file contents<br/>    echo $content;<br/><br/>    // Close the file<br/>    fclose($handle);<br/>} else {<br/>    echo 'Unable to open file';<br/>}<br/>?&gt;</code>

The script first opens example.txt with fopen() , stores the pointer in $handle , then uses filesize() to determine how many bytes to read and passes that value to fread() . The read content is echoed, and finally the file is closed with fclose() .

Note that fread() returns a byte stream, so you may need to process or decode it according to your specific requirements.

If you need to start reading from a specific position, you can provide the optional $offset argument to skip ahead in the file.

In summary, fread() is a powerful PHP function for reading a specified length of data from an opened file, suitable for text, binary, or other file types, and can greatly enhance file‑handling capabilities in PHP applications.