Check File Size - PHP - IF Then

$file = '/path/to/your/file';
$filesize = filesize($file);

echo "The size of your file is $filesize bytes.";

$file = '/path/to/your/file';
$filesize = filesize($file); // bytes
$filesize = round($filesize / 1024, 2); // kilobytes with two digits

echo "The size of your file is $filesize KB.";

$file = '/path/to/your/file';
$filesize = filesize($file); // bytes
$filesize = round($filesize / 1024 / 1024, 1); // megabytes with 1 digit

echo "The size of your file is $filesize MB.";

if($filesize >=100)
{
echo "filesize is greater than 100 bytes";
}