PHP filesize() Function Usage and Example

PHP Filesystem Reference Manual

The filesize() function can return the size of the specified file. If successful, this function can return the file size (in bytes), if failed, then return false.

Syntax

int filesize ( string $filename )

If an error occurs, this function can return the file size (in bytes) or false (and can generate an E_WARNING level error).

Online Example

<?php
　　　$filename = "sample.txt";
　　　echo $filename . ': ' . filesize($filename) . ' bytes';
?>

Output Result

sample.txt:　27　bytes

PHP Filesystem Reference Manual