计算PHP字符串中的确切子字符串 [英] Count exact substring in a string in php

问题描述

我怎么知道一个字符串中一个子字符串的确切出现次数.例如，考虑以下字符串:

How can I know the exact number of occurences of a substring in a string. For example consider the following string:

$string = 'The sun is bright, what a beatiful sunlight';

当我搜索单词"sun"时，我希望它返回1而不是2.这种情况发生在我这样做时:

when I search for the word 'sun' I want it to return 1 instead of 2. That happens when I do:

$counter = substr_count($string, 'sun');

有什么主意吗?

推荐答案

$wordCounts = array_count_values(str_word_count($string,1));
$sunCount = (isset($wordCounts['sun'])) ? $wordCounts['sun'] : 0;

区分大小写...如果不区分大小写，则可能需要使用带有单词边界的正则表达式

Case-sensitive... if you want case-insensitive, you'll probably need to use a regular expression using word boundaries

$sunCount = preg_match_all('/\bsun\b/i',$string);

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