格式化文件大小

gistfile1.php

function size_format( $bytes, $decimals = 0 ) {
    $quant = array(
        // ========================= Origin ====
        'TB' => 1099511627776,  // pow( 1024, 4)
        'GB' => 1073741824,     // pow( 1024, 3)
        'MB' => 1048576,        // pow( 1024, 2)
        'kB' => 1024,           // pow( 1024, 1)
        'B ' => 1,              // pow( 1024, 0)
    );
    foreach ( $quant as $unit => $mag )
        if ( doubleval($bytes) >= $mag )
            return number_format( $bytes / $mag, $decimals ) . ' ' . $unit;
 
    return false;
}