Maybe it's just me but I was doing a test and found a normal loop to be faster then array_map (atleast in my case)..here are some of the speed results...

1) looping through an array and using mysql_real_escape_string() on each value

2) using array map with mysql_real_escape_string();

0.000141
0.00068


0.000161
0.000702

0.000351
0.001889

sorry if this has been pointed out before.