How to count the number of occurences of a pattern in a string in PHP

Question

What does the function `preg_match_all($pattern, $str)` ?

Accepted Answer

returns the number of occurences of `$pattern` in `$str`

Answer

replaces occurences of `$pattern` in `$str` by another string

Answer

returns 1 if `$pattern` is found in `$str`, 0 otherwise

Answer

returns `true` if `$pattern` if found in `$str`, `false` otherwise

Question from the PHP - Fundamentals test