Detailed explanation of obtaining file size in php

This article mainly shares with you the detailed explanation of how to obtain the file size in php. I hope it can help you.

The size of the file can be obtained through the filesize function. The file size is expressed in bytes.

$filename = '/data/webroot/usercode/code/resource/test.txt';
$size = filesize($filename);

If you want to convert the unit of file size, you can define your own function to achieve it.

function getsize($size, $format = 'kb') {
    $p = 0;
    if ($format == 'kb') {
        $p = 1;
    } elseif ($format == 'mb') {
        $p = 2;
    } elseif ($format == 'gb') {
        $p = 3;
    }
    $size /= pow(1024, $p);
    return number_format($size, 3);
}$filename = '/data/webroot/usercode/code/resource/test.txt';$size = filesize($filename);$size = getsize($size, 'kb'); //进行单位转换echo $size.'kb';

It is worth noting that the size of the directory cannot be obtained through a simple function. The size of the directory is the sum of the sizes of all subdirectories and files in the directory. Therefore, a recursive method is needed to calculate the directory in a loop. the size of.

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