php代码片段

1. PHP网址 URL拼接

$_SERVER['QUERY_STRING']  获取获取当前url的所有querystring

parse_str and http_build_query: 

parse_str($queryString, $params);

foreach ($params as $key => $term)

{

    $these = array_diff_assoc($params, array($key => $term));

    printf("<a href=\"?%s\">%s</a><br>\n", http_build_query($these), $term);

}

Example output:

<a href="?b=b&c=c">a</a><br>

<a href="?a=a&c=c">b</a><br>

<a href="?a=a&b=b">c</a><br> 

参考 http://stackoverflow.com/questions/8609163/php-retrieve-keys-from-query-string-for-each-key-create-url-removing-that-key 

2.php 获取当前url

 $url_this =  "http://".$_SERVER ['HTTP_HOST'].$_SERVER['PHP_SELF'];  

3.strtotime("-1 week")， strtotime("-n days")；可以很方便的获取当前日期的前n天、周、月的时间戳