PHP preg_split : Split string by other strings

Question

我想用一系列单词拆分一个大字符串。

例如

$splitby = array('these','are','the','words','to','split','by');
$text = 'This is the string which needs to be split by the above words.';

那么结果就是:

$text[0]='This is';
$text[1]='string which needs';
$text[2]='be';
$text[3]='above';
$text[4]='.';

我该怎么做？是preg_split最好的方法，还是有更有效的方法？我希望它尽可能快，因为我将拆分数百 MB 的文件。

Answer 1

这应该是相当有效的。但是，您可能想要测试一些文件并报告性能。

$splitby = array('these','are','the','words','to','split','by');
$text = 'This is the string which needs to be split by the above words.';
$pattern = '/\s?'.implode($splitby, '\s?|\s?').'\s?/';
$result = preg_split($pattern, $text, -1, PREG_SPLIT_NO_EMPTY);

• 正则表达式演示:http://rubular.com/r/jNUO1KvrXg
• PHP 代码演示:http://www.ideone.com/ov3Wl