php中常用自定义函数

//获取时间
function wordTime($time) {
    $time = (int) substr($time, 0, 10);
    $int = time() - $time;
    $str = '';
    if ($int <= 2){
        $str = sprintf('刚刚', $int);
    }elseif ($int < 60){
        $str = sprintf('%d秒前', $int);
    }elseif ($int < 3600){
        $str = sprintf('%d分钟前', floor($int / 60));
    }elseif ($int < 86400){
        $str = sprintf('%d小时前', floor($int / 3600));
    }elseif ($int < 2592000){
        $str = sprintf('%d天前', floor($int / 86400));
    }else{
        $str = date('Y-m-d', $time);
    }
    return $str;
}

//秒转时分秒
function secToTime($times){  
    $result = '00:00:00';  
    if ($times>0){
        $hour = floor($times/3600);  
        $minute = floor(($times-3600 * $hour)/60);  
        $second = floor((($times-3600 * $hour) - 60 * $minute) % 60);  
        $result = $hour.':'.$minute.':'.$second;  
    }  
    return $result;  
} 

//将对象转为数组
function object_to_array($obj) {
    $obj = (array)$obj;
    foreach ($obj as $k => $v) {
        if (gettype($v) == 'resource') {
            return;
        }
        if (gettype($v) == 'object' || gettype($v) == 'array') {
            $obj[$k] = (array)object_to_array($v);
        }
    }
    return $obj;
}

//获取ip
function get_ip() {
    //strcasecmp 比较两个字符，不区分大小写。返回0，>0，<0。
    if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
        $ip = getenv('HTTP_CLIENT_IP');
    } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
        $ip = getenv('HTTP_X_FORWARDED_FOR');
    } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
        $ip = getenv('REMOTE_ADDR');
    } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    $res =  preg_match ( '/[\d\.]{7,15}/', $ip, $matches ) ? $matches [0] : '';
    return $res;
}