curl 基础例子
只要你编译完的PHP设置了支持cURL扩展，你就可以开始使用cURL函数了。使用cURL函数的基本思想是先使用 curl_init() 初始化一个cURL会话，接着你可以通过 curl_setopt() 设置你需要的全部选项，然后使用 curl_exec() 来执行会话，当执行完会话后使用 curl_close() 关闭会话。这是一个使用cURL函数获取example.com的主页保存到文件的例子：
Example #1 使用PHP的cURL模块获取example.com的主页
<?php
$ch = curl_init ( "http://www.example.com/" );
$fp = fopen ( "example_homepage.txt" , "w" );
curl_setopt ( $ch , CURLOPT_FILE , $fp );
curl_setopt ( $ch , CURLOPT_HEADER , 0 );
curl_exec ( $ch );
curl_close ( $ch );
fclose ( $fp );
?> 用户评论:
[#1] Roberto Braga [2015-04-01 09:45:41]
It is important to notice that when using curl to post form data and you use an array for CURLOPT_POSTFIELDS option, the post will be in multipart format
<?php
$params=['name'=>'John', 'surname'=>'Doe', 'age'=>36)
$defaults = array(
CURLOPT_URL => 'http://myremoteservice/',
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => $params,
);
$ch = curl_init();
curl_setopt_array($ch, ($options + $defaults));
?>
This produce the following post header:
--------------------------fd1c4191862e3566
Content-Disposition: form-data; name="name"
Jhon
--------------------------fd1c4191862e3566
Content-Disposition: form-data; name="surnname"
Doe
--------------------------fd1c4191862e3566
Content-Disposition: form-data; name="age"
36
--------------------------fd1c4191862e3566--
Setting CURLOPT_POSTFIELDS as follow produce a standard post header
CURLOPT_POSTFIELDS => http_build_query($params),
Which is:
name=John&surname=Doe&age=36
This caused me 2 days of debug while interacting with a java service which was sensible to this difference, while the equivalent one in php got both format without problem.
[#2] Anon [2014-02-18 11:16:10]
IMO this example would have been better if it had done a check for curl_error(), in order to advertize the existence of this function to people learning about cURL who try the example but mysteriously get no response back for whatever reason.
[#3] Anon [2014-02-18 10:25:21]
The example fetches a resource (the homepage of a website) and writes it to the the file represented by $fp.
Judging from comments elsewhere in this chapter, the example given ought to set CURLOPT_RETURNTRANSFER to true prior to setting CURLOPT_FILE.
[#4] simon dot riget at gmail dot com [2013-04-30 10:23:05]
Using ArangoDB with PHP
Coding with a NoSQL data base like ArangoDB can be made more complicated then need be. A simple solution to code for ArangoDB is to use the REST interface directly.
All you need is a few initialization variables and a small function to ease the typing - and of cause install the php5-curls module...
See ArangoDB REST API documentation for options and request types.
<?php
// Initialize options for REST interface
$adb_url="http://127.0.0.1:8529";
$adb_option_defaults = array(
CURLOPT_HEADER => false,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_TIMEOUT => 2
);
// ArangoDB REST function.
// Connection are created demand and closed by PHP on exit.
function adb_rest($method,$uri,$querry=NULL,$json=NULL,$options=NULL){
global $adb_url,$adb_handle,$adb_option_defaults;
// Connect
if(!isset($adb_handle)) $adb_handle = curl_init();
echo "DB operation: $method $uri $querry $json\n";
// Compose querry
$options = array(
CURLOPT_URL => $adb_url.$uri."?".$querry,
CURLOPT_CUSTOMREQUEST => $method, // GET POST PUT PATCH DELETE HEAD OPTIONS
CURLOPT_POSTFIELDS => $json,
);
curl_setopt_array($adb_handle,($options + $adb_option_defaults));
// send request and wait for responce
$responce = json_decode(curl_exec($adb_handle),true);
echo "Responce from DB: \n";
print_r($responce);
return($responce);
}
?>
Here's some examples:
<?php
// Create a collection
$responce = adb_rest("POST","/_api/collection","",'{"name" : "test"}');
// Create a document
$responce = adb_rest("POST","/_api/document","collection=test",'{ "hello" : "World" }');
// List documents in a collection
$responce=adb_rest("GET","/_api/document","collection=test");
// Change document
$document_handle=$responce['documents'][0];
$responce=adb_rest("PATCH",$document_handle,"",'{ "hello" : "World of mine" }');
// Show document
$responce=adb_rest("GET",$document_handle);
// Search
$responce=adb_rest("POST","/_api/cursor","",'{
"query" : "FOR t IN test RETURN t",
"count" : true,
"batchSize" : 50
}');
while($responce['hasMore'])
$responce=adb_rest("PUT","/_api/cursor/".$responce['id']);
// Delete document
$responce=adb_rest("DELETE",$document_handle);
// DB Delete collection
$responce=adb_rest("DELETE","/_api/collection/test");
// to handle errors, add something like this:
if($responce['error']) die ("can't create collection");
?>