Insert string at specified position

by 
$newstr = substr_replace($oldstr, $str_to_insert, $pos, 0);

http://php.net/substr_replace

In the above snippet, $pos is used in the offset argument of the function.

offset
If offset is non-negative, the replacing will begin at the
offset’th offset into string.

If offset is negative, the replacing will begin at the offset’th
character from the end of string.

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