Get first letters of substrings in string

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 ?

Not sure what you want to do with that, but if you plan to transform every first letter into capitals, theres a special function in php called ucfirst() || php.net/manual/en/function.ucfirst.php — Realitätsverlust
– Realitätsverlust, Commented Dec 9, 2013 at 10:53
I just want to get first letters as described above. No transformation will be involved here. — hsz
– hsz, Commented Dec 9, 2013 at 10:54
Kay, then i suppose the easiest way will be if you just explode the string and use the substr method on each row of the array which you get from explode, like described below. — Realitätsverlust
– Realitätsverlust, Commented Dec 9, 2013 at 10:55

Tredged · Accepted Answer · 2013-12-09 10:50:53Z

1

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

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

You mean this?

answered Dec 9, 2013 at 10:50

Tredged

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Neeraj Kumar · Accepted Answer · 2013-12-09 10:51:27Z

0

you can use and substr function to achieve this

like below

$str = "foo_bar_buz_oof_rab";

$arr = explode("_",$str);
$new_str = '';
foreach($arr as $a){

  $new_str .= $new_str .substr($a,0,1);

}

echo $new_str;

This will give your desired output

answered Dec 9, 2013 at 10:51

Neeraj Kumar

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1 Comment

ThaMe90 Over a year ago

This will double your $new_str every time you iterate through the loop, as you already use the .= concat operator.

hsz · Accepted Answer · 2013-12-09 11:00:00Z

0

I also did it with:

$output = implode(array_map(function($k){ return $k[0]; }, explode('_', $input)));

answered Dec 9, 2013 at 11:00

hsz

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