PHP size conversion function

size_convert_func.php

<?php
function convertSize(float $size, string $convert_from = 'B', string $convert_to = 'KB', bool $format = true, int $decimals = 2): float
{
    $size = sprintf("%.2f", $size);//Int to float
    if ($convert_from === 'B') {
        if ($convert_to === 'KB') {
            $value = ($size / 1024);
        } elseif ($convert_to === 'MB') {
            $value = ($size / 1048576);
        } elseif ($convert_to === 'GB') {
            $value = ($size / 1073741824);
        } elseif ($convert_to === 'TB') {
            $value = ($size / 1099511627776);
        } else {
            $value = $size;
        }
    } elseif ($convert_from === 'KB') {
        if ($convert_to === 'B') {
            $value = ($size * 1024);
        } elseif ($convert_to === 'MB') {
            $value = ($size * 0.00097656);
        } elseif ($convert_to === 'GB') {
            $value = ($size * 0.0000009537);
        } elseif ($convert_to === 'TB') {
            $value = ($size * 0.00000000093132);
        } else {
            $value = $size;
        }
    } elseif ($convert_from === 'MB') {
        if ($convert_to === 'B') {
            $value = ($size * 1048576);
        } elseif ($convert_to === 'KB') {
            $value = ($size * 1024);
        } elseif ($convert_to === 'GB') {
            $value = ($size * 0.0009765625);
        } elseif ($convert_to === 'TB') {
            $value = ($size * 0.00000095367432);
        } else {
            $value = $size;
        }
    } elseif ($convert_from === 'GB') {
        if ($convert_to === 'B') {
            $value = ($size * 1073741824);
        } elseif ($convert_to === 'KB') {
            $value = ($size * 1048576);
        } elseif ($convert_to === 'MB') {
            $value = ($size * 1024);
        } elseif ($convert_to === 'TB') {
            $value = ($size * 0.0009765625);
        } else {
            $value = $size;
        }
    } elseif ($convert_from === 'TB') {
        if ($convert_to == 'B') {
            $value = ($size * 1099511627776);
        } elseif ($convert_to === 'KB') {
            $value = ($size * 1073741824);
        } elseif ($convert_to === 'MB') {
            $value = ($size * 1048576);
        } elseif ($convert_to === 'GB') {
            $value = ($size * 1024);
        } else {
            $value = $size;
        }
    } else {
        $value = $size;
    }
    if ($format) $value = number_format($value, $decimals);
    return floatval($value);
}