note: if we not include startup time at above code, 
at 100k PHP and Perl have almost similiar performance

$ time perl -e 'for($i=0;$i<=100000;$i++){}'

real    0m0.010s
user    0m0.008s
sys 0m0.000s

$ time php -r 'for($i=0;$i<=100000;$i++){}'

real    0m0.030s
user    0m0.016s
sys 0m0.012s