PHP: Return string between two characters

Question

I am wanting to use \"keywords\" within a large string. These keywords start and end using my_keyword and are user defined. How, within a large string, can I sear

Answer 1

Output:

array(3) {
  [0]=>
  string(4) "best"
  [1]=>
  string(12) "most popular"
  [2]=>
  string(1) "I"
}