在非常长的文本中仅保留前1000个单词[重复]

Question

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• Truncate string after certain number of substring occurrences in PHP? [duplicate] 5 answers

How do I keep only the first 1000 occurrences of a words in a very long text and discard everything behind.

For example:

Sentence 1[ss]Sentence 2[ss]Sentence 3[ss]Sentence 4[ss]...Sentence 999[ss]Sentence 1000[ss]Sentence 1001[ss]Sentence 1002[ss]

Note: [ss] is my self-defined separator.

I would like to keep Sentence 1[ss]Sentence 2[ss]...Sentence 1000[ss]. In other words, I would like to keep EVERYTHING (including the [ss]) until the Sentence 1000[ss] and discard everything behind Sentence 1000[ss].

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Answer 1

You can explode the string, slice the array and then implode it again:

$sentences = explode('[ss]', $string);
$sentences = array_slice($sentences,0, 1000);
$string = implode('[ss]', $sentences);