Exclude all characters after a character 3rd in a string. how do I write the code?

Exclude all characters after a character 3rd appears in the string. how can I write the code to exclude all characters after a character 3rd appears in the string, how to write the code, such as the string "2 Hello 2 haha 2 right Ah hahaha" is to exclude all the characters after 3rd 2 to get the result "2 Hello 2 haha 2 please know the eldest brother directly to the code thank you! & nbsp; exclude all characters after a character 3rd appears in the string. how can I write the code?
Exclude all characters after a character 3rd appears in the string. how can I write the code?

For example, the string "2 Hello 2 haha 2 right Ah haha"

Exclude all the characters after 3rd characters and 2 to get the result "2 Hello 2 haha 2"

Could you tell me the code? thank you.

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------ Solution --------------------

$ S = '2, Hello, 2, haha, 2, haha ';
$ Ar = explode ('2', $ s );
Echo implode ('2', array_slice ($ ar, 0, 3 ));