我有 preg_match_all 函数：
preg_match_all('#<h2>(.*?)</h2>#is', $source, $output, PREG_SET_ORDER);
它按预期工作，但问题是，它对所有项目进行了两次 preg_matches 并放入一个巨大的多维数组中，如下所示，例如，按照预期，preg_matches 所需的所有 11 个项目，但两次并放入多维数组中：
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
)
)
如何将这个数组转换为简单的数组并且没有那些重复的项目？非常感谢。
你总是会得到一个多维数组，但是，你可以像这样接近你想要的：
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
如果您根本不需要子匹配，则使用非捕获分组：
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，对 preg_match_all 的调用使用 PREG_PATTERN_ORDER 而不是 PREG_SET_ORDER：
PREG_PATTERN_ORDER 对结果进行排序，以便 $matches[0] 是一个数组
完整模式匹配，$matches[1] 是匹配的字符串数组
第一个带括号的子模式，依此类推。
PREG_SET_ORDER 对结果进行排序，以便 $matches[0] 是第一个的数组
一组匹配，$matches[1] 是第二组匹配的数组，并且
很快。
See: http://php.net/manual/en/function.preg-match-all.php http://php.net/manual/en/function.preg-match-all.php
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