php整理小功能

1.字符串和十六进制互转

<?php
   /**
    *字符串转十六进制函数 加密
    *@pream string $str='abc';
    */
    function strToHex($str){ 
        $hex="";
        for($i=0;$i<strlen($str);$i++)
        $hex.=dechex(ord($str[$i]));
        $hex=strtoupper($hex);
        return $hex;
    } 
    /**
    *十六进制转字符串函数  解密
    *@pream string $hex='616263';
    */ 
    function hexToStr($hex){   
        $str=""; 
        for($i=0;$i<strlen($hex)-1;$i+=2)
        $str.=chr(hexdec($hex[$i].$hex[$i+1]));
        return  $str;
    } 
?>

加密内容:要加密的内容sxfenglei
E8A681E58AA0E5AF86E79A84E58685E5AEB9737866656E676C6569
解密内容:E8A681E58AA0E5AF86E79A84E58685E5AEB9737866656E676C6569
要加密的内容sxfenglei

2.获取当前时间戳、日期，精确到毫秒

首先，我们封装一个获取时间戳的方法：

第一种方法：时间戳13位

/**
 * 获取时间戳到毫秒
 * @return bool|string
 */
public static function getMillisecond(){
    list($msec, $sec) = explode(' ', microtime());
    $msectime =  (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
    return $msectimes = substr($msectime,0,13);
}

成功获取到了，时间戳且精确到了毫秒！---- 13位
第二种方法：时间戳浮点型

/**
 * 时间戳 - 精确到毫秒
 * @return float
 */
public static function getMillisecond() {
    list($t1, $t2) = explode(' ', microtime());
    return (float)sprintf('%.0f',(floatval($t1)+floatval($t2))*1000);
}

第三种方法：14位年月日时分秒+3位毫秒数

/**
 * 年月日、时分秒 + 3位毫秒数
 * @param string $format
 * @param null $utimestamp
 * @return false|string
 */
public static function ts_time($format = 'u', $utimestamp = null) {
    if (is_null($utimestamp)){
        $utimestamp = microtime(true);
    }
 
    $timestamp = floor($utimestamp);
    $milliseconds = round(($utimestamp - $timestamp) * 1000);
 
    return date(preg_replace('`(?<!\\\\)u`', $milliseconds, $format), $timestamp);
}

3.获取客户端IP地址

function getClientIp() {
        $realip = '';
        $unknown = 'unknown';
        if (isset($_SERVER)){
            if(isset($_SERVER['HTTP_CDN_SRC_IP']) && !empty($_SERVER['HTTP_CDN_SRC_IP']) && strcasecmp($_SERVER['HTTP_CDN_SRC_IP'], $unknown)){
                $realip = $_SERVER['HTTP_CDN_SRC_IP'];
            }else if(isset($_SERVER['HTTP_X_FORWARDED_FOR']) && !empty($_SERVER['HTTP_X_FORWARDED_FOR']) && strcasecmp($_SERVER['HTTP_X_FORWARDED_FOR'], $unknown)){
                $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
                foreach($arr as $ip){
                    $ip = trim($ip);
                    if ($ip != 'unknown'){
                        $realip = $ip;
                        break;
                    }
                }
            }else if(isset($_SERVER['HTTP_CLIENT_IP']) && !empty($_SERVER['HTTP_CLIENT_IP']) && strcasecmp($_SERVER['HTTP_CLIENT_IP'], $unknown)){
                $realip = $_SERVER['HTTP_CLIENT_IP'];
            }else if(isset($_SERVER['REMOTE_ADDR']) && !empty($_SERVER['REMOTE_ADDR']) && strcasecmp($_SERVER['REMOTE_ADDR'], $unknown)){
                $realip = $_SERVER['REMOTE_ADDR'];
            }else{
                $realip = $unknown;
            }
        }else{
            if(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), $unknown)){
                $realip = getenv("HTTP_X_FORWARDED_FOR");
            }else if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), $unknown)){
                $realip = getenv("HTTP_CLIENT_IP");
            }else if(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), $unknown)){
                $realip = getenv("REMOTE_ADDR");
            }else{
                $realip = $unknown;
            }
        }
        $realip = preg_match("/[\d\.]{7,15}/", $realip, $matches) ? $matches[0] : $unknown;
        return $realip;
}

4.php 把对象转化为json

  /**
    * 对象转换数组
    */
    function object_to_array($obj){
        if(is_array($obj)){
           return $obj;
        }
        $_arr = is_object($obj)? get_object_vars($obj) :$obj;
        foreach ($_arr as $key => $val){
            $val=(is_array($val)) || is_object($val) ? object_to_array($val) :$val;
            $arr[$key] = $val;
        }
        return json_encode($arr);
    }