【PHP笔记】PHP中好用的代码片段

此笔记主要记录PHP中常用到的一些代码片段

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锚点

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分页功能

效果图

PHP

/**
 * 分页
 * @param $page_count   总页数
 * @param $show_number  显示多少页
 * @return string
 */
function paging($page_count,$show_number){
    $getAttr=$_GET;

    $currentPage=!empty($getAttr['page']) ? $getAttr['page'] : 1;
    $href='//'.$_SERVER['SERVER_NAME'].$_SERVER["PATH_INFO"];
    $pageStr='';
    //上一页
    if($currentPage>1){
        $getAttr['page']=$currentPage-1;
        $url=$href."?".http_build_query($getAttr);
        $pageStr='<a href="'.$url.'" class="page-prev">上一页</a>';
    }else{
        $pageStr.='<a href="javascript:;" class="page-prev paging-disabled">上一页</a>';
    }
    //当前页数的前后
    $leftPage_num=floor($show_number/2);
    $rightPage_num=$show_number-$leftPage_num;
    $left=max($currentPage-$leftPage_num,1);
    $right=min($left+$show_number-1,$page_count);
    $left=max($right-$show_number+1,1);

    //省略部分和显示最小页数(首页)
    if($left>1){
        $_GET['page']=1;
        $url=$href."?".http_build_query($_GET);
        $pageStr.='<a href="'.$url.'" class="page-next">'.$_GET['page'].'</a>';
        //特殊条件  如 上一页1...234下一页  就去掉省略号直接显示  上一页1234下一页
        if(($left-1)!=1){
            $pageStr.='<span  class="spr">…</span>';
        }
    }
    //显示页码
    for($i=$left;$i<$right+1;$i++){
        $_GET['page']=$i;
        if($currentPage==$i){
            $pageStr.='<span class="paging-current">'.$i.'<em>'.$i.'</em></span>';
        }else{
            $url=$href."?".http_build_query($_GET);
            $pageStr.='<a href="'.$url.'" class="">'.$i.'</a>';
        }

    }
    //省略部分和最大页数（末页）
    if($right<$page_count){
        $_GET['page']=$page_count;
        $url=$href."?".http_build_query($_GET);
        //特殊条件  如 上一页123...4下一页  就去掉省略号直接显示
        if(($right+1)!=$page_count){
            $pageStr.='<span  class="spr">…</span>';
        }
        $pageStr.='<a href="'.$url.'" class="page-next">'.$_GET['page'].'</a>';
    }
    //下一页
    if($currentPage!=$page_count){
        $getAttr['page']=$currentPage+1;
        $url=$href."?".http_build_query($getAttr);
        $pageStr.='<a href="'.$url.'" class="page-next">下一页</a>';
    }else{
        $pageStr.='<a href="javascript:;" class="page-next paging-disabled">下一页</a>';
    }
    $pageStr='<div class="pagingCtn">'.$pageStr.'</div>';
    return $pageStr;
}

css

.pagingCtn {
    display: inline-block;
    vertical-align: middle;
    margin: 10px 0;
    font-size: 0;
}
.pagingCtn>a:first-child, .pagingCtn>a:first-child em {
    border-radius: 2px 0 0 2px;
}
.pagingCtn a, .pagingCtn span {
    display: inline-block;
    vertical-align: middle;
    padding: 0 15px;
    height: 28px;
    line-height: 28px;
    margin: 0 -1px 5px 0;
    background-color: #fff;
    color: #333;
    font-size: 12px;
}
.pagingCtn a {
    text-decoration: none;
}
.pagingCtn  a:hover {
    color: #009688;
}
.pagingCtn a,.pagingCtn span {
    text-align: center;
    border: 1px solid #e2e2e2;
}
.pagingCtn>.paging-current{
    position: relative;

}
.pagingCtn>.paging-current em {
    position: absolute;
    left: -1px;
    top: -1px;
    padding: 1px;
    width: 100%;
    height: 100%;
    background-color: #009688;
    color: #FFF;
    font-style: normal;
    border-radius: 2px;
    box-sizing: content-box;
    z-index: 1;
}
.paging-disabled,.paging-disabled:hover {
    color: #d2d2d2!important;
    cursor: not-allowed!important;
}

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IP获取

PHP

/**
 * 获取客户端IP地址
 * @param integer   $type 返回类型 0 返回IP地址 1 返回IPV4地址数字
 * @param boolean   $adv 是否进行高级模式获取（有可能被伪装）
 * @return mixed
 */
function ip($type = 0, $adv = false)
{
    $type      = $type ? 1 : 0;
    static $ip = null;
    if (null !== $ip) {
        return $ip[$type];
    }

    if ($adv) {
        if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
            $pos = array_search('unknown', $arr);
            if (false !== $pos) {
                unset($arr[$pos]);
            }
            $ip = trim(current($arr));
        } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
            $ip = $_SERVER['HTTP_CLIENT_IP'];
        } elseif (isset($_SERVER['REMOTE_ADDR'])) {
            $ip = $_SERVER['REMOTE_ADDR'];
        }
    } elseif (isset($_SERVER['REMOTE_ADDR'])) {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    // IP地址合法验证
    $long = sprintf("%u", ip2long($ip));
    $ip   = $long ? [$ip, $long] : ['0.0.0.0', 0];
    return $ip[$type];
}