PHP实用函数解析：获取IP、日期操作与数据检查

<? 
function GetIP() { //获取IP 
    if ($_SERVER["HTTP_X_FORWARDED_FOR"]) 
        $ip = $_SERVER["HTTP_X_FORWARDED_FOR"]; 
    else if ($_SERVER["HTTP_CLIENT_IP"]) 
        $ip = $_SERVER["HTTP_CLIENT_IP"]; 
    else if ($_SERVER["REMOTE_ADDR"]) 
        $ip = $_SERVER["REMOTE_ADDR"]; 
    else if (getenv("HTTP_X_FORWARDED_FOR")) 
        $ip = getenv("HTTP_X_FORWARDED_FOR"); 
    else if (getenv("HTTP_CLIENT_IP")) 
        $ip = getenv("HTTP_CLIENT_IP"); 
    else if (getenv("REMOTE_ADDR")) 
        $ip = getenv("REMOTE_ADDR"); 
    else 
        $ip = "Unknown"; 
    return $ip; 
} 
?> 




<?php 
function DateAdd($date, $int, $unit = "d") { //时间的增加（还可以改进成时分秒都可以增加，有时间再补上） $dateArr = explode("-", $date); 
    $value[$unit] = $int; 
    return date("Y-m-d", mktime(0,0,0, $dateArr[1] + $value['m'], $dateArr[2] + $value['d'], $dateArr[0] + $value['y'])); GetWeekDay($date) {  //计算出给出的日期是星期几 
    $dateArr = explode("-", $date); 
    return date("w", mktime(0,0,0,$dateArr[1],$dateArr[2],$dateArr[0])); ?> 
 

    
 

} 

function 
 

}
 
//检查日期、时间合法性

 


<? 
function check_date($date) { //检查日期是否合法日期 
    $dateArr = explode("-", $date); 
    if (is_numeric($dateArr[0]) && is_numeric($dateArr[1]) && is_numeric($dateArr[2])) { 
        return checkdate($dateArr[1],$dateArr[2],$dateArr[0]); 
    } 
    return false; 
} 
function check_time($time) {  //检查时间是否合法时间 
    $timeArr = explode(":", $time); 
    if (is_numeric($timeArr[0]) && is_numeric($timeArr[1]) && is_numeric($timeArr[2])) { 
        if (($timeArr[0] >= 0 && $timeArr[0] <= 23) && ($timeArr[1] >= 0 && $timeArr[1] <= 59) && ($timeArr[2] >= 0 && $timeArr[2] <= 59)) true; 
        else 
            return false;