在字符串中获取子串的第一个字母

Question

Question can be unclear, but here is what I want to achieve.

I have following string:

$input  = 'foo_bar_buz_oof_rab';

I need to get in the output following string:

$output = 'fbbor';

As you can see, the point is to explode string with _ and get the first letters of the substrings. What is the best method to get it ? Regex, explode and loop over substrings ?

Answer 1

$words = explode("_", "BLA_BLA_BLA_BLA");
$acronym = "";

foreach ($words as $w) {
  $acronym .= $w[0];
}

You mean this?