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PHP实现的带超时功能get_headers函数

Jun 06, 2016 pm 08:10 PM
php

这篇文章主要介绍了PHP实现的带超时功能的get_headers函数,本文直接给出实现代码,需要的朋友可以参考下

代码比较多,但是比较简单,一眼就看穿的,so,文字尽量少写了。
因为众所周知的网络原因,gavatar也开始越来越慢,写了一个小东西来解决这个问题,过程中遇到了get_headers这个函数,甚是忧伤,记录下来,以免后来人踩坑。
更新记录,函数稍微改了一下,返回值基本和之前序列化后的结果一致,暂时没考虑支持子项也支持数组等(考虑细节性能,还想把没用的http头砍掉….)
需求很简单:获取图片的head信息。
调试程序的时候发现这个函数的调用很缓慢,,即使绑定ip,有时候都能蹦到20多秒。
寻思这个事情还是该加个超时吧,但是看官方文档,给出的导出函数接口如下:

复制代码 代码如下:


array get_headers(string$url[,int$format=0])


你没有看错,这个东西没有超时接口…
上github翻看源码,期望可以用他的底层实现来重新实现一套:
地址

复制代码 代码如下:


/* {{{ proto array get_headers(string url[, int format])
   fetches all the headers sent by the server in response to a HTTP request */
PHP_FUNCTION(get_headers)
{
char*url;
size_t url_len;
php_stream_context*context;
php_stream*stream;
zval*prev_val,*hdr=NULL,*h;
HashTable*hashT;
zend_long format=0;
               
if(zend_parse_parameters(ZEND_NUM_ARGS()TSRMLS_CC,"s|l",&url,&url_len,&format)==FAILURE){
return;
}
 
/** 省略其他一堆... **/
}
/* }}} */

但是很不幸的是,zend_parse_parameters 和 ZEND_NUM_ARGS也都没有PHP版的导出函数。
于是造轮子开始:

复制代码 代码如下:


functionget_url_headers($url,$timeout=10)
{
    $ch=curl_init();
 
    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch,CURLOPT_HEADER,true);
    curl_setopt($ch,CURLOPT_NOBODY,true);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch,CURLOPT_TIMEOUT,$timeout);
 
    $data=curl_exec($ch);
    $data=preg_split('/\n/',$data);
 
    $data=array_filter(array_map(function($data){
        $data=trim($data);
        if($data){
            $data=preg_split('/:\s/',trim($data),2);
            $length=count($data);
            switch($length){
                case2:
                    returnarray($data[0]=>$data[1]);
                    break;
                case1:
                    return$data;
                    break;
                default:
                    break;
            }
        }
    },$data));
 
    sort($data);
 
    foreach($dataas$key=>$value){
        $itemKey=array_keys($value)[0];
        if(is_int($itemKey)){
            $data[$key]=$value[$itemKey];
        }elseif(is_string($itemKey)){
            $data[$itemKey]=$value[$itemKey];
            unset($data[$key]);
        }
    }
 
    return$data;
}

对比最后结果:
原版又是蛮长的等待,不知道校验啥去了(没继续追代码了,有兴趣的童鞋可以去跟下玩):

复制代码 代码如下:


Array
(
    [0]=>HTTP/1.0302Found
    [Accept-Ranges]=>bytes
    [Cache-Control]=>max-age=300
    [Content-Type]=>Array
        (
            [0]=>text/html;charset=utf-8
            [1]=>text/html;charset=utf-8
        )
 
    [Date]=>Array
        (
            [0]=>Fri,12Dec201415:35:40GMT
            [1]=>Fri,12Dec201415:35:43GMT
        )
 
    [Expires]=>Fri,12Dec201415:40:40GMT
    [Last-Modified]=>Wed,11Jan198408:00:00GMT
    [Link]=>;
    [Location]=>[省略...]
    [Server]=>Array
        (
            [0]=>ECS(oxr/838B)
            [1]=>nginx
        )
 
    [Source-Age]=>85
    [Via]=>1.1varnish
    [X-Cache]=>302-HIT
    [X-Varnish]=>14702550881470006304
    [Content-Length]=>0
    [Connection]=>Array
        (
            [0]=>close
            [1]=>close
        )
 
    [1]=>HTTP/1.1504Gateway Timeout
)

轮子版返回(瞬间返回,两者内容略有不同,你仔细看就能发现一些有趣的地方了):

复制代码 代码如下:

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