PHP Regex获取youtube视频ID? [英] PHP Regex to get youtube video ID?

问题描述

有人可以教我如何从网址中获取youtube ID，而不管网址中还有其他GET变量吗.

以该视频为例:http://www.youtube.com/watch?v=C4kxS1ksqtw&feature=related
因此介于v=和下一个&

之间

解决方案

使用parse_url ()和 parse_str().

(您几乎可以将正则表达式用于任何东西，但是它们很容易出错，因此，如果有专门针对您要完成的功能的PHP函数，请使用这些正则表达式.)

parse_url接受一个字符串并将其切成具有大量信息的数组.您可以使用此数组，也可以将所需的一项指定为第二个参数.在这种情况下，我们对查询感兴趣，该查询为PHP_URL_QUERY.

现在我们有了查询，它是v=C4kxS1ksqtw&feature=relate，但是我们只想要v=之后的部分.为此，我们转向parse_str，它基本上像一个字符串上的GET一样工作.它接受一个字符串并创建该字符串中指定的变量.在这种情况下，将创建$v和$feature.我们只对$v感兴趣.

为了安全起见，您不想只将parse_url中的所有变量存储在名称空间中(请参阅mellowsoon的注释).而是将变量存储为数组的元素，以便您可以控制要存储的变量，并且不会意外覆盖现有变量.

将所有内容放在一起，我们拥有:

<?php
$url = "http://www.youtube.com/watch?v=C4kxS1ksqtw&feature=relate";
parse_str( parse_url( $url, PHP_URL_QUERY ), $my_array_of_vars );
echo $my_array_of_vars['v'];    
  // Output: C4kxS1ksqtw
?> 

> 工作示例

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呵呵-谢谢查尔斯.这让我发笑，我以前从未看过Zawinski的名言:

Some people, when confronted with a problem, think ‘I know, I’ll use regular expressions.’ Now they have two problems. – Jamie Zawinski

Can someone show me how to get the youtube id out of a url regardless of what other GET variables are in the URL.

Use this video for example: http://www.youtube.com/watch?v=C4kxS1ksqtw&feature=related
So between v= and before the next &

解决方案

Use parse_url() and parse_str().

(You can use regexes for just about anything, but they are very easy to make an error in, so if there are PHP functions specifically for what you are trying to accomplish, use those.)

parse_url takes a string and cuts it up into an array that has a bunch of info. You can work with this array, or you can specify the one item you want as a second argument. In this case we're interested in the query, which is PHP_URL_QUERY.

Now we have the query, which is v=C4kxS1ksqtw&feature=relate, but we only want the part after v=. For this we turn to parse_str which basically works like GET on a string. It takes a string and creates the variables specified in the string. In this case $v and $feature is created. We're only interested in $v.

To be safe, you don't want to just store all the variables from the parse_url in your namespace (see mellowsoon's comment). Instead store the variables as elements of an array, so that you have control over what variables you are storing, and you cannot accidentally overwrite an existing variable.

Putting everything together, we have:

<?php
$url = "http://www.youtube.com/watch?v=C4kxS1ksqtw&feature=relate";
parse_str( parse_url( $url, PHP_URL_QUERY ), $my_array_of_vars );
echo $my_array_of_vars['v'];    
  // Output: C4kxS1ksqtw
?> 

Working example

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Edit:

hehe - thanks Charles. That made me laugh, I've never seen the Zawinski quote before:

Some people, when confronted with a problem, think ‘I know, I’ll use regular expressions.’ Now they have two problems. – Jamie Zawinski

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