PHP：如何获取在字符串中出现特定次数的所有子字符串[关闭]

Question

In php what function can I use to get a return of all substrings that appear >=13 times in a string? Can you provide example of how to use it? Cheers.

Example: I have a substring such as "rain in the same place, rain in the new place, rain in the old place". I would like to print out all of the substrings that appear 3 or more times in the string. The answer would give an array of array(rain, in, the, place)

Answer 1

You ask for substrings but your examples show that you want words:

$words = str_word_count($string, 1);

$frequency = array_count_values($words);

$result = array_filter($frequency, function ($x) { return $x >= 13; });

For non-English and non-Spanish languages you have to pass a string that contains all characters from desired language as a 3rd param to the str_word_count method.

Also I don't know why have you asked an array of array.