如何仅返回带有preg_match或preg_match_all的命名组? [英] How to return only named groups with preg_match or preg_match_all?

问题描述

示例:

$string = "This is some text written on 2010-07-18.";
preg_match('|(?<date>\d\d\d\d-\d\d-\d\d)|i', $string, $arr_result);
print_r($arr_result);

返回:

Array
(
    [0] => 2010-07-18
    [date] => 2010-07-18
    [1] => 2010-07-18
)

但我希望它是

Array
(
    [date] => 2010-07-18
)

在PHP的PDO对象中，有一个选项可以通过删除这些重复的编号值来从数据库中过滤结果: PDO::FETCH_ASSOC .但是我还没有看到PHP中PCRE函数的类似修饰符.

In PHP's PDO object there is an option that is filtering results from database by removing these duplicate numbered values : PDO::FETCH_ASSOC. But I haven't seen similar modifier for the PCRE functions in PHP yet.

推荐答案

我不认为您可以使preg_*做到这一点，但是您可以通过一个简单的循环来做到这一点.但是我不明白为什么这些元素会带来问题.

I do not think you can make preg_* do it, but you can do it with a simple loop. But I don't see why those elements pose a problem.

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