The filesize() function in PHP is an inbuilt function which is used to return the size of a specified file. The filesize() function accepts the filename as a parameter and returns the size of a file in bytes on success and False on failure.
The result of the filesize() function is cached and a function called clearstatcache() is used to clear the cache.
Syntax:
filesize($filename)
Parameters: The filesize() function in PHP accepts only one parameter $filename. It specifies the filename of the file whose size you want to check.
Return Value: It returns the size of a file in bytes on success and False on failure.
Errors And Exception:
- For files which are larger than 2GB some filesystem functions may return unexpected results since PHP’s integer type is signed and many platforms use 32bit integers.
- The buffer must be cleared if the filesize() function is used multiple times.
- The filesize() function emits an E_WARNING in case of a failure.
Examples:
Input : echo filesize("gfg.txt");
Output : 256
Input : $myfile = 'gfg.txt';
echo $myfile . ': ' . filesize($myfile) . ' bytes';
Output : gfg.txt : 256 bytes
Below programs illustrate the filesize() function.
Program 1:
<?php   // displaying file size using // filesize() function echo filesize("gfg.txt");   ?> |
Output:
256
Program 2:
<?php   // displaying file size using // filesize() function $myfile = 'gfg.txt';   echo $myfile . ': ' . filesize($myfile) . ' bytes';   ?> |
Output:
gfg.txt : 256 bytes
