php 转换秒到日期、时或者分

function seconds2days($mysec) {
    $mysec = (int)$mysec;
    if ( $mysec === 0 ) {
        return '0 second';
    }

    $mins  = 0;
    $hours = 0;
    $days  = 0;

    if ( $mysec >= 60 ) {
        $mins = (int)($mysec / 60);
        $mysec = $mysec % 60;
    }
    if ( $mins >= 60 ) {
        $hours = (int)($mins / 60);
        $mins = $mins % 60;
    }
    if ( $hours >= 24 ) {
        $days = (int)($hours / 24);
        $hours = $hours % 60;
    }

    $output = '';

    if ($days){
        $output .= $days." days ";
    }
    if ($hours) {
        $output .= $hours." hours ";
    }
    if ( $mins ) {
        $output .= $mins." minutes ";
    }
    if ( $mysec ) {
        $output .= $mysec." seconds ";
    }
    $output = rtrim($output);
    return $output;
}
//该片段来自于http://outofmemory.cn