curl_init()

(PHP 4 >= 4.0.2, PHP 5, PHP 7)

初始化 cURL 会话

说明

curl_init([string $url= NULL]): resource

初始化新的会话，返回 cURL 句柄，供curl_setopt()、curl_exec()和curl_close()函数使用。

参数

$url

如果提供了该参数，CURLOPT_URL选项将会被设置成这个值。你也可以使用curl_setopt()函数手动地设置这个值。

Note:

如果设置了open_basedir，file协议会被 cURL 禁用。

返回值

如果成功，返回 cURL 句柄，出错返回FALSE。

范例

初始化新的 cURL 会话并获取一个网页

<?php
// 创建一个新cURL资源
$ch = curl_init();
// 设置URL和相应的选项
curl_setopt($ch, CURLOPT_URL, "http://www.example.com/");
curl_setopt($ch, CURLOPT_HEADER, 0);
// 抓取URL并把它传递给浏览器
curl_exec($ch);
// 关闭cURL资源，并且释放系统资源
curl_close($ch);
?>

参见

• curl_close()关闭 cURL 会话
• curl_multi_init()返回一个新cURL批处理句柄

Just to clarify:
Spaces in the URL need to be replaced with a %20.
Spaces in the querystring need to be replaced with a +

Regarding spaces in URLs;
Please read
http://php.net/manual/en/function.urlencode.php

curl_init() has undefined behavior if you pass 'false' to it and can crash when you try to copy the resulting handle using curl_copy_handle(). Keep this in mind if you create a wrapper object for CURL.

Curl_init as well as CURLOPT_URL don't like to have static strings as parameter.
I came across this by accident and it took me very long to find out. curl_exec will throw error 3 (Malformed) and you tipple check the URL in it's variable only to find by trial and error that it's declaration is the culprit.
So never do this:
static $someurl = "http://www.example.com/interfacce.php";
....
$ch=curl_init($someurl);
....
$return=curl_exec($ch);
Cheers

For some reason on some webservers it may not be able to understand what cURL is doing. If you're getting unexpected results (like getting no output when the URL is valid) while using curl_init(). Add a trailing slash '/' after the url if you haven't done so already.

e.g. you can check how many characters are on test_1.php
or you can it use for more, i have used this function for a nagios check.
<?PHP
echo "CURL - function test <br>" ;
if ($load == 1){
function webcheck ($url) {
    $ch = curl_init ($url) ;
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1) ;
    $res = curl_exec ($ch) ;
    curl_close ($ch) ;
    return ($res) ;
}
echo "url = $url <br>" ;
$erg = webcheck("my_page.php/test_1.php") ;
$zahl = strlen ($erg) ;
echo "length = $zahl " ;
?>

<?php 
function curl($url,$posts=""){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
curl_setopt($ch, CURLOPT_POST, $posts ? 0 :1;); 
curl_setopt($ch, CURLOPT_POSTFIELDS,$posts);
$icerik = curl_exec($ch);
return $icerik;
curl_close($ch);
} 
/*Bu fonksiyonu kullanarak kolayca curl yi kullanabilirsiniz.
Kullanımı*/
echo curl("http://gencbilgin.net/");
?>
Bu kodlar http://gencbilgin.net/curl-kutuphanesi-ve-kullanimi.html adresinden alınmıştır...