Question

Using PHP, let’s say I have this string:

$letters = "abcde";

I would like to add the character “7” between every character, but so it only occurs once. The result should be an array as follows:

$lettersArray = array(
  7abcde,
  a7bcde,
  ab7cde,
  abc7de,
  abcd7e,
  abcde7
);

Note: the length of $letters is dynamic from 1 to 12 characters

I have tried using loops with array_splice and str_split with implode, but I can’t quite figure out the right logic.

Answer 1

Try this:

$letters ='abcdefghi';
$lettersArray = array();
for($i=0;$i < strlen($letters)+1; $i++) {
    $new = substr($letters, 0, $i);
    $new .= '7';
    $new .= substr($letters, $i);
    $lettersArray[] = $new;
}
print_r($lettersArray);

What this does is take each element of the array, and inserts the letter 7 in an incrementing fashion into the array item.