【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];}