preg_match_all成简单的数组 [英] preg_match_all into simple array

问题描述

我有preg_match_all功能：

I have preg_match_all function:

preg_match_all('#<h2>(.*?)</h2>#is', $source, $output, PREG_SET_ORDER);

它的工作如预期，但问题是，它preg_matches所有项目两次，成为一个巨大的多维数组像这样的例子在那里，如预期，preg_matched所有11个项目需要的，但两次，成多维数组：

It's working as intended, BUT the problem is, it preg_matches all items twice and into a huge multi dimensional array like this for example where it, as intended, preg_matched all 11 items needed, but twice and into a multidimensional array:

Array
(
    [0] => Array
        (
            [0] => <h2>10. <em>Cruel</em> by St. Vincent</h2>
            [1] => 10. <em>Cruel</em> by St. Vincent
        )

    [1] => Array
        (
            [0] => <h2>9. <em>Robot Rock</em> by Daft Punk</h2>
            [1] => 9. <em>Robot Rock</em> by Daft Punk
        )

    [2] => Array
        (
            [0] => <h2>8. <em>Seven Nation Army</em> by the White Stripes</h2>
            [1] => 8. <em>Seven Nation Army</em> by the White Stripes
        )

    [3] => Array
        (
            [0] => <h2>7. <em>Do You Want To</em> by Franz Ferdinand</h2>
            [1] => 7. <em>Do You Want To</em> by Franz Ferdinand
        )

    [4] => Array
        (
            [0] => <h2>6. <em>Teenage Dream</em> by Katie Perry</h2>
            [1] => 6. <em>Teenage Dream</em> by Katie Perry
        )

    [5] => Array
        (
            [0] => <h2>5. <em>Crazy</em> by Gnarls Barkley</h2>
            [1] => 5. <em>Crazy</em> by Gnarls Barkley
        )

    [6] => Array
        (
            [0] => <h2>4. <em>Kids</em> by MGMT</h2>
            [1] => 4. <em>Kids</em> by MGMT
        )

    [7] => Array
        (
            [0] => <h2>3. <em>Bad Romance</em> by Lady Gaga</h2>
            [1] => 3. <em>Bad Romance</em> by Lady Gaga
        )

    [8] => Array
        (
            [0] => <h2>2. <em>Pumped Up Kicks</em> by Foster the People</h2>
            [1] => 2. <em>Pumped Up Kicks</em> by Foster the People
        )

    [9] => Array
        (
            [0] => <h2>1. <em>Paradise</em> by Coldplay</h2>
            [1] => 1. <em>Paradise</em> by Coldplay
        )

    [10] => Array
        (
            [0] => <h2>Song That Get Stuck In Your Head YouTube Playlist</h2>
            [1] => Song That Get Stuck In Your Head YouTube Playlist
        )

)

如何数组转换成简单的，没有那些重复的项目？非常感谢你。

How to convert this array into simple one and without those duplicated items? Thank you very much.

推荐答案

您总是会得到一个多维数组回来了，不过，你可以得到接近你想要这样的：

You will always get a multidimensional array back, however, you can get close to what you want like this:

if (preg_match_all('#<h2>(.*?)</h2>#is', $source, $output, PREG_PATTERN_ORDER))
    $matches = $output[0]; // reduce the multi-dimensional array to the array of full matches only

如果你不希望子匹配的话，那么使用非捕获分组：

And if you don't want the submatch at all, then use a non-capturing grouping:

if (preg_match_all('#<h2>(?:.*?)</h2>#is', $source, $output, PREG_PATTERN_ORDER))
    $matches = $output[0]; // reduce the multi-dimensional array to the array of full matches only

请注意，这个调用preg_match_all使用preG_PATTERN_ORDER代替preG_SET_ORDER：

Note that this call to preg_match_all is using PREG_PATTERN_ORDER instead of PREG_SET_ORDER:

preG_PATTERN_ORDER结果排序使得$ matches [0]是一个数组
  全模式匹配，$匹配[1]是匹配的字符串数组
  第一个括号中的子模式，等等。

PREG_PATTERN_ORDER Orders results so that $matches[0] is an array of full pattern matches, $matches[1] is an array of strings matched by the first parenthesized subpattern, and so on.

preG_SET_ORDER结果排序使得$ matches [0]是第一个数组
  比赛集，$匹配[1]为第二组匹配的数组，
  等等。

PREG_SET_ORDER Orders results so that $matches[0] is an array of first set of matches, $matches[1] is an array of second set of matches, and so on.

请参阅：<一href=\"http://php.net/manual/en/function.$p$pg-match-all.php\">http://php.net/manual/en/function.$p$pg-match-all.php

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