Question

我想使用preg_match_all函数从一个站点获取多个数据。但是当我多次使用此正则表达式命令（。*？）时，该功能不起作用。

它不是json。我从任何instagram个人资料的源代码中获取数据。例如：view-source：https：//www.instagram.com/ziynetaki当您打开链接时，可以看到以下代码。脚本类型=“ text / javascript”> window._sharedData = .....

我尝试过：

$display = '#__typename":"GraphImage","id":"(.*?)","edge_media_to_caption":{"edges":[{"node":{"text":"(.*?)"}}]},"shortcode":"(.*?)","edge_media_to_comment":{"count":(.*?)},"comments_disabled":false,"taken_at_timestamp":(.*?),"dimensions":{"height":(.*?),"width":(.*?)},"display_url":"(.*?)","edge_liked_by"#i';

preg_match_all($display, $url, $dop);
print_r($dop);

，输出为空：

Array ( [0] => Array ( ) [1] => Array ( ) [2] => Array ( ) [3] => Array ( ) [4] => Array ( ) [5] => Array ( ) [6] => Array ( ) [7] => Array ( ) )

有人可以帮我吗？我搜索了很多解决方案，但找不到任何信息。我不知道如何在互联网上进行搜索，因为我的英语不太好，谢谢。

Answer 1

由于匹配失败，您的正则表达式模式有一个小错误。

您的正则表达式在这部分[中有一个{"edges":[{"node"字符，您没有转义，因此它表现为字符集，并且破坏了正则表达式的预期含义。

只需逃避[，您的模式就可以开始匹配并给出预期的结果。另外，如果您的输入跨越多行，则可以启用DOTALL模式以使.匹配新行，但是到目前为止，您的输入字符串并不需要它并且可以按原样工作。

Check here

检查您的PHP代码，

$url = '"edges":[{"node":{"__typename":"GraphImage","id":"1998193948597745904","edge_media_to_caption":{"edges":[{"node":{"text":"test"}}]},"shortcode":"Bu7As8ygPjw","edge_media_to_comment":{"count":0},"comments_disabled":false,"taken_at_timestamp":1552423302,"dimensions":{"height":216,"width":320},"display_url":"https://instagram.fdel1-4.fna.fbcdn.net/vp/b26fc82649aebaba80ff8750844d9476/5D32EFAE/t51.2885-15/e35/52508202_381950182383672_2887085630092404003_n.jpg?_nc_ht=instagram.fdel1-4.fna.fbcdn.net","edge_liked_by":{"count":6},"edge_media_preview_like":{"count":6}';
$display = '#__typename":"GraphImage","id":"(.*?)","edge_media_to_caption":{"edges":\[{"node":{"text":"(.*?)"}}]},"shortcode":"(.*?)","edge_media_to_comment":{"count":(.*?)},"comments_disabled":false,"taken_at_timestamp":(.*?),"dimensions":{"height":(.*?),"width":(.*?)},"display_url":"(.*?)","edge_liked_by"#i';

preg_match_all($display, $url, $dop);
print_r($dop);

打印所有预期的捕获，

Array
(
    [0] => Array
        (
            [0] => __typename":"GraphImage","id":"1998193948597745904","edge_media_to_caption":{"edges":[{"node":{"text":"test"}}]},"shortcode":"Bu7As8ygPjw","edge_media_to_comment":{"count":0},"comments_disabled":false,"taken_at_timestamp":1552423302,"dimensions":{"height":216,"width":320},"display_url":"https://instagram.fdel1-4.fna.fbcdn.net/vp/b26fc82649aebaba80ff8750844d9476/5D32EFAE/t51.2885-15/e35/52508202_381950182383672_2887085630092404003_n.jpg?_nc_ht=instagram.fdel1-4.fna.fbcdn.net","edge_liked_by"
        )

    [1] => Array
        (
            [0] => 1998193948597745904
        )

    [2] => Array
        (
            [0] => test
        )

    [3] => Array
        (
            [0] => Bu7As8ygPjw
        )

    [4] => Array
        (
            [0] => 0
        )

    [5] => Array
        (
            [0] => 1552423302
        )

    [6] => Array
        (
            [0] => 216
        )

    [7] => Array
        (
            [0] => 320
        )

    [8] => Array
        (
            [0] => https://instagram.fdel1-4.fna.fbcdn.net/vp/b26fc82649aebaba80ff8750844d9476/5D32EFAE/t51.2885-15/e35/52508202_381950182383672_2887085630092404003_n.jpg?_nc_ht=instagram.fdel1-4.fna.fbcdn.net
        )

)

Online PHP Demo

Preg_match_all多个内容

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