How to insert a string inside another string?

Question

Just looked at function

str_pad($input, $pad_length, $pad_str, [STR_PAD_RIGHT, STR_PAD_LEFT, or STR_PAD_BOTH])

which helps to pad some str

Answer 1

You're looking for a string insert, not a padding.

Padding makes a string a set length, if it's not already at that length, so if you were to give a pad length 3 to "abcdef", well it's already at 3, so nothing should happen.

Try:

$newstring = substr_replace($orig_string, $insert_string, $position, 0);

PHP manual on substr_replace