How Do I Convert File Sizes from Bytes to Human-Readable Formats in PHP?

Computing File Sizes in Human-Readable Formats

Determining file sizes in meaningful units like kilobytes, megabytes, or gigabytes is a common task. When files are stored in bytes, a conversion is necessary for user-friendly display.

Solution

The PHP function formatBytes() offers a solution. Here's how it works:

function formatBytes($bytes, $precision = 2) { 
    $units = array('B', 'KB', 'MB', 'GB', 'TB'); 
   
    $bytes = max($bytes, 0); 
    $pow = floor(($bytes ? log($bytes) : 0) / log(1024)); 
    $pow = min($pow, count($units) - 1); 
   
    // Uncomment one of the following alternatives
    // $bytes /= pow(1024, $pow);
    // $bytes /= (1 << (10 * $pow)); 
   
    return round($bytes, $precision) . $units[$pow]; 
} 

Implementation

1. Create an array $units containing the unit names (B, KB, MB, etc.).
2. Calculate the power of 1024 to convert bytes to the appropriate unit.
3. Divide $bytes by the calculated power to get the converted value.
4. Round the result to the specified precision.
5. Concatenate the formatted value with the corresponding unit name.

Example

To convert 5445632 bytes to a user-friendly format with two decimal places:

echo formatBytes(5445632, 2); // Output: 5.24 MB

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