curl_multi_getcontent()

(PHP 5, PHP 7)

如果设置了CURLOPT_RETURNTRANSFER，则返回获取的输出的文本流

说明

如果CURLOPT_RETURNTRANSFER作为一个选项被设置到一个具体的句柄，那么这个函数将会以字符串的形式返回那个cURL句柄获取的内容。

参数

由curl_init()返回的 cURL 句柄。

返回值

如果设置了CURLOPT_RETURNTRANSFER，则返回获取的输出的文本流。

参见

• curl_multi_init()返回一个新cURL批处理句柄

This seems to work as expected for me - allowing me to get the content from a curl_multi operation into variables :
(Thanks go to many other notes in related documentation (there is much copy/pasting) all I did was add the relevant line(s))

You can use curl_multi_getcontent() on a curl handle that was executed with curl_exec() (and not added to a multi handle).
However, this is not very useful because curl_multi_getcontent() will return the same as curl_exec() then.

will return:
bool(true)

It's probably a bug in the curl multi implementation:
In many many cases you keep the curl connection alive after a curl_exec(). 
With curl_multi that's not possible if you don't do this after every get_content() :
 curl_multi_remove_handle($ch);
 curl_multi_add_handle($ch);
I've not yet tested if this also breaks the keepalive connection but if you don't do this you'll just get the old previous response after each curl_multi_exec()