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" means to exclude all the characters after 3rd 2 get the result "2 Hello 2 haha 2" please know the eldest brother directly code Okay? Thanks for excluding all the characters after the occurrence of a character string for 3rd times, how to write 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 for sharing it:
------ Solution --------------------

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