php常用函数之URL函数

base64_encode($str) 对字符进行base64加密，此加密主要是为了便于传输

base64_decode($str) 对进行base64加密的字符串进行解密

urlencode($str)编码url字符串

urldecode($str)解码已经编码的url字符串

rawurlencode($str)按照RFC 1738对url进行编码

rawurldecode($str)对编码的url进行解码

get_headers($url);获取一个http请求的返回信息

get_meta_tags($file_url); 获取页面中的meta信息

http_build_query($arr) 将一个数组生成一个url请求串

parse_url($url);解析url并返回组成部分的数组，若某部分没有，则不创建改元素

举例

<?php
//base64_encode($str) 对字符进行base64加密，此加密主要是为了便于传输
//base64_decode($str) 对进行base64加密的字符串进行解密
$str = "我爱北京天安门1233fasfhsafsaffsahfsajf我爱死你鞥路eahdhafffjf2345555";
$str1 = base64_encode($str);
echo $str1;
echo "<br/>";
echo base64_decode($str1);

//urlencode($str)编码url字符串
//urldecode($str)解码已经编码的url字符串
//rawurlencode($str)按照RFC 1738对url进行编码
//rawurldecode($str)对编码的url进行解码
//urlencode()和rawurlencode()区别就是当字符串中有空格时，urlencode()转化成+，而rawurlencode()转化成%20；

$str = "safsj!@#$%Z^&*Z()_+我爱北京天安门   ";
echo rawurlencode($str);
echo "<br/>";
echo urlencode($str);

//get_headers($url);获取一个http请求的返回信息

$url = 'http://www.sina.com.cn';
echo "<pre>";
print_r(get_headers($url));
echo "<br/>";
print_r(get_headers($url,1));
/*
Array
(
[0] => HTTP/1.0 200 OK
[1] => Last-Modified: Sun, 17 Mar 2013 11:32:21 GMT
[2] => Accept-Ranges: bytes
[3] => X-Powered-By: mod_xlayout/rc2
[4] => Content-Type: text/html
[5] => Date: Sun, 17 Mar 2013 11:36:04 GMT
[6] => Server: Apache
[7] => Expires: Sun, 17 Mar 2013 11:37:04 GMT
[8] => Cache-Control: max-age=60
[9] => Vary: Accept-Encoding
[10] => Age: 52
[11] => Content-Length: 695395
[12] => X-Cache: HIT from xd33-83.sina.com.cn
[13] => Connection: close
)

Array
(
[0] => HTTP/1.0 200 OK
[Last-Modified] => Sun, 17 Mar 2013 11:32:21 GMT
[Accept-Ranges] => bytes
[X-Powered-By] => mod_xlayout/rc2
[Content-Type] => text/html
[Date] => Sun, 17 Mar 2013 11:36:23 GMT
[Server] => Apache
[Expires] => Sun, 17 Mar 2013 11:37:23 GMT
[Cache-Control] => max-age=60
[Vary] => Accept-Encoding
[Age] => 33
[Content-Length] => 695395
[X-Cache] => HIT from xd33-81.sina.com.cn
[Connection] => close
)

*/

//index1.html中必须包含如下格式的内容，才会返回有值的数组
// <meta name="type" http-equiv="content-type" content="text/html; charset=utf-8">
// <meta name="desc" http-equiv="content-type" content="我做个测试">
$tags = get_meta_tags('./index1.html');
echo "<pre>";
print_r($tags);

echo "<br/>";
/*
Array
(
[type] => text/html; charset=utf-8
[desc] => 我做个测试
)
*/

//parse_url($url);解析url并返回组成部分的数组，若某部分没有，则不创建改元素

$arr = parse_url('http://finance.sina.com.cn/consume/qyzh/20130316/123014854680.shtml');
echo "<pre>";
print_r($arr);

//http_build_query($arr) 将一个数组生成一个url请求串

    
$para_arr = array('id'=>1,'sex'=>0,'name'=>'lisi');

echo "<pre>";
print_r (http_build_query($para_arr));

//id=1&sex=0&name=lisi