https://mp.weixin.qq.com/s/8luqMEd8xt8oJxFLLCU1XA
文章正文
cURL是利用url语法规定传输文件和数据的工具。php中有curl拓展，一般用来实现网络抓取，模拟发送get post请求，文件上传。
在php中建立curl的基本步骤如下：
1 初始化 2 设置选项，包括url 3 执行并获取结果 4 释放curl句柄。
在工作和学习中，我也是时常用的curl。由于在使用curl设置选项时，各种选项比较难以记忆，需要参考，故在此记录下常用的一些例子，以便后来参考。
实例一 ： 抓取网页数据（以拉手网开放api为例，也是get请求）
如果用这种方法发get请求，参数附加到url后面即可
如curl_setopt($ch, CURLOPT_URL, "http://localhost/tqj/date/p822.php?name=yyyyy");
实例 2 利用curl发送post请求
'tianquanjun', 'password' => 'tianquanjun',);//初始化$ch = curl_init ();//各种项设置，网上参考而来，可以查看php手册，自己设置curl_setopt ( $ch, CURLOPT_URL, $uri );curl_setopt ( $ch, CURLOPT_POST, 1 );//post方式curl_setopt ( $ch, CURLOPT_HEADER, 0 );curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );curl_setopt ( $ch, CURLOPT_POSTFIELDS, $data );//执行$return = curl_exec ( $ch );//释放curl_close ( $ch );print_r($return);?>
实例三 ：curl 过程调试与错误信息处理
'tianquanjun', 'password' => 'tianquanjun',);//初始化$ch = curl_init ();//各种项设置，网上参考而来，可以查看php手册，自己设置curl_setopt ( $ch, CURLOPT_URL, $uri );curl_setopt ( $ch, CURLOPT_POST, 1 );//post方式curl_setopt ( $ch, CURLOPT_HEADER, 0 );curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );curl_setopt ( $ch, CURLOPT_POSTFIELDS, $data );//执行$return = curl_exec ( $ch );//容错机制if($return === false){ var_dump(curl_error($ch)); }//curl_getinfo()获取各种运行中信息，便于调试 $info = curl_getinfo($ch);echo "执行时间".$info['total_time'].PHP_EOL;//释放curl_close ( $ch );print_r($return);?>
其中利用curl_error()获取错误信息，curl_getinfo()获取运行相关信息。
实例四 上传图片，获取返回信息。
跨域上传图片，同时获取返回信息，这个就能大显身手。和post比较像，注意文件之前加一个@符号
'tianquanjun', 'upload' => '@C:\Users\tianquanjun.DANGDANG\Pictures\a.jpg',);//初始化$ch = curl_init ();//各种项设置，网上参考而来，可以查看php手册，自己设置curl_setopt ( $ch, CURLOPT_URL, $uri );curl_setopt ( $ch, CURLOPT_POST, 1 );//post方式curl_setopt ( $ch, CURLOPT_HEADER, 0 );curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );curl_setopt ( $ch, CURLOPT_POSTFIELDS, $data );//执行$return = curl_exec ( $ch );//容错机制if($return === false){ var_dump(curl_error($ch)); }//curl_getinfo()获取各种运行中信息，便于调试 $info = curl_getinfo($ch);echo "执行时间".$info['total_time'].PHP_EOL;//释放curl_close ( $ch );print_r($return);?> 实例五 ： curl批处理。
curl有一个高级特性，批处理句柄。允许打开多个curl链接。
批处理就是打开多个curl句柄，并把这些句柄指派给一个批处理句柄，然后在while循环里等待处理完毕。curl_multi_exec()算是称得上多线程处理，不过它还是属于异步的范畴。
0);$res=array();for($j=0;$j<2;$j++){ $res[$j]=curl_multi_getcontent($ch[$j]);}//关闭句柄for($k=0;$k<2;$k++){ curl_multi_remove_handle($mh,$ch[$k]);}curl_multi_close($mh);print_r($res);?>
基本算是列举了常用的一些实例。要想灵活运用curl，还是得熟悉curl的各个设置项，这些设置项才是curl的灵魂。
==========================亲测效果===============================================
getwether.php
var_dump(curl_errno($obj));//int(0) 返回最后一次的错误号 var_dump(curl_error($obj)); //string(0) "" 返回一个保护当前会话最近一次错误的字符串
在cmd命令行中输入：
php -f getwether.php >wether.txt
int(0)执行时间：0.187河北 邯郸 53892 53892.jpg 2018/10/17 22:45:23 8℃/19℃ 10月17日 多云 北风小于3级 1.gif 1.gif 今日天气实况：气温：12℃；风向/风力：北风 1级；湿度：77%；紫外线强度：弱。空气质量：中。 紫外线指数：弱，辐射较弱，涂擦SPF12-15、PA+护肤品。健臻·血糖指数：易波动，血糖易波动，注意监测。穿衣指数：较舒适，建议穿薄外套或牛仔裤等服装。洗车指数：较适宜，无雨且风力较小，易保持清洁度。空气污染指数：中，易感人群应适当减少室外活动。 8℃/18℃ 10月18日 多云 南风小于3级 1.gif 1.gif 9℃/19℃ 10月19日 多云 南风小于3级 1.gif 1.gif 邯郸市是河北省最古老的城市，也是我国古代著名的城邑。早在2000多年前的春秋初期，就有邯郸的建制，当时邯郸已是一个人口聚居的城市。战国时作为赵国都城历经158年，秦统一后分别设邯郸县、邯郸郡。当时的邯郸经济昌盛、繁荣发达，与长安、洛阳、开封、成都同称五大都城。邯郸位于河北省南部，地处太行山东麓、淦阳河上，是晋冀鲁豫四省接壤的腹地。邯郸市位于太行山东麓，属暖温带半湿润半干旱大陆季风性气候。特点是四季分明，雨量适中，秋、春两季短，冬、夏两季长。邯郸市的自然环境得天独厚，西倚太行山，东临滏阳河，地势西北高、东南低，中部丘陵起伏，盆地交错；并有沁河、渚河、输元河流经市区（皆属滏阳河支流），丰富的水利资源为农业生产提供了优良的条件。景观：黄梁梦吕仙祠、永年君臣上寿石刻、学步桥、磁州窑、古邺城、兰陵王墓、天子冢、响堂山石窟、磁山古文化遗址等。
====================爬去豆瓣电影api==================================
'; print_r($info); echo '';*/ $movies=json_decode($opt,true); echo count($movies); echo ''; print_r($movies); echo '';}curl_close($obj);
结果：
5Array( [count] => 3 [start] => 0 [total] => 21 [subjects] => Array ( [0] => Array ( [rating] => Array ( [max] => 10 [average] => 8.1 [stars] => 40 [min] => 0 ) [genres] => Array ( [0] => 剧情 [1] => 动作 [2] => 犯罪 ) [title] => 无双 [casts] => Array ( [0] => Array ( [alt] => https://movie.douban.com/celebrity/1044899/ [avatars] => Array ( [small] => https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p35678.jpg [large] => https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p35678.jpg [medium] => https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p35678.jpg ) [name] => 周润发 [id] => 1044899 ) [1] => Array ( [alt] => https://movie.douban.com/celebrity/1041390/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p49475.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p49475.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p49475.jpg ) [name] => 郭富城 [id] => 1041390 ) [2] => Array ( [alt] => https://movie.douban.com/celebrity/1016668/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p146.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p146.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p146.jpg ) [name] => 张静初 [id] => 1016668 ) ) [collect_count] => 325710 [original_title] => 無雙 [subtype] => movie [directors] => Array ( [0] => Array ( [alt] => https://movie.douban.com/celebrity/1014716/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p3555.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p3555.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p3555.jpg ) [name] => 庄文强 [id] => 1014716 ) ) [year] => 2018 [images] => Array ( [small] => https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2535096871.jpg [large] => https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2535096871.jpg [medium] => https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2535096871.jpg ) [alt] => https://movie.douban.com/subject/26425063/ [id] => 26425063 ) [1] => Array ( [rating] => Array ( [max] => 10 [average] => 7.4 [stars] => 40 [min] => 0 ) [genres] => Array ( [0] => 剧情 [1] => 动作 [2] => 武侠 ) [title] => 影 [casts] => Array ( [0] => Array ( [alt] => https://movie.douban.com/celebrity/1274235/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p805.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p805.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p805.jpg ) [name] => 邓超 [id] => 1274235 ) [1] => Array ( [alt] => https://movie.douban.com/celebrity/1004856/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1415690807.36.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1415690807.36.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1415690807.36.jpg ) [name] => 孙俪 [id] => 1004856 ) [2] => Array ( [alt] => https://movie.douban.com/celebrity/1275564/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1366015827.84.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1366015827.84.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1366015827.84.jpg ) [name] => 郑恺 [id] => 1275564 ) ) [collect_count] => 255137 [original_title] => 影 [subtype] => movie [directors] => Array ( [0] => Array ( [alt] => https://movie.douban.com/celebrity/1054398/ [avatars] => Array ( [small] => https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p568.jpg [large] => https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p568.jpg [medium] => https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p568.jpg ) [name] => 张艺谋 [id] => 1054398 ) ) [year] => 2018 [images] => Array ( [small] => https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2530513100.jpg [large] => https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2530513100.jpg [medium] => https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2530513100.jpg ) [alt] => https://movie.douban.com/subject/4864908/ [id] => 4864908 ) [2] => Array ( [rating] => Array ( [max] => 10 [average] => 5.1 [stars] => 25 [min] => 0 ) [genres] => Array ( [0] => 喜剧 ) [title] => 李茶的姑妈 [casts] => Array ( [0] => Array ( [alt] => https://movie.douban.com/celebrity/1363857/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1519453932.46.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1519453932.46.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1519453932.46.jpg ) [name] => 黄才伦 [id] => 1363857 ) [1] => Array ( [alt] => https://movie.douban.com/celebrity/1350408/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1437031126.82.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1437031126.82.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1437031126.82.jpg ) [name] => 艾伦 [id] => 1350408 ) [2] => Array ( [alt] => https://movie.douban.com/celebrity/1350407/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1437031175.04.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1437031175.04.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1437031175.04.jpg ) [name] => 宋阳 [id] => 1350407 ) ) [collect_count] => 112833 [original_title] => 李茶的姑妈 [subtype] => movie [directors] => Array ( [0] => Array ( [alt] => https://movie.douban.com/celebrity/1313050/ [avatars] => Array ( [small] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1518587170.5.jpg [large] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1518587170.5.jpg [medium] => https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1518587170.5.jpg ) [name] => 吴昱翰 [id] => 1313050 ) ) [year] => 2018 [images] => Array ( [small] => https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2533384240.jpg [large] => https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2533384240.jpg [medium] => https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2533384240.jpg ) [alt] => https://movie.douban.com/subject/27092785/ [id] => 27092785 ) ) [title] => 正在上映的电影-邯郸)
curl_getinfo函数获得信息：
=============================================curl获得慕课用户信息=================================================
结果：
string(0) ""int(0)青春阳光爱伟的课程 全部课程2018 10月22日
2018 10月14日
2018 10月10日2018 09月09日
2018 08月20日2018 08月08日2018 08月07日
2018 08月01日
2018 07月30日
2018 07月15日
2018 04月20日
2018 04月18日
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==================================curl从ftp下载文件=============================================
===================================curl 往ftp上传文件===============================================
==============================curl 下载https中的数据==============================================