the following:
$input = [[5=>"richard=red"], [15=>"york=yellow"], [25=>"gave=green"], [30=>"battle=blue"], [35=>"in=indigo"], [40=>"vain=violet"]];
array_splice($input, 2, 0, [[10=>"of=orange"]]);
var_dump($input);
gives this:
array (size=7)
0 =>
array (size=1)
5 => string 'richard=red' (length=11)
1 =>
array (size=1)
15 => string 'york=yellow' (length=11)
2 =>
array (size=1)
10 => string 'of=orange' (length=9)
3 =>
array (size=1)
25 => string 'gave=green' (length=10)
4 =>
array (size=1)
30 => string 'battle=blue' (length=11)
5 =>
array (size=1)
35 => string 'in=indigo' (length=9)
6 =>
array (size=1)
40 => string 'vain=violet' (length=11)
