Posted by Frans Fierens on 08/16/05 13:46

I've noticed that php cli scripts using for-loops with some if...then's
are very slow using the php cli (command line interface). The following
php script takes somewhat 100 seconds (php v5.0.3 on a redhat linux, 3
Ghz PC). The same program in c (see below) less than 1 second ... I know
that php is a scripting language, but isn't the difference between de c
compiled prog and de php script not very extreme ?

Frans

php script :

#!/usr/bin/php
<?php

$a=0;
$r=100;

for($p=1;$p<=3;$p++)
{
for ($c=1; $c<=1230; $c++)
{
for ($j=0;$j<=23;$j++)
{
for ($z=0; $z<=$r; $z++)
{
$a++;
if($p==1 && $c!=500 && $j==22)
{
$a--;
}
if($p==2 && $c!=600 && $j==21)
{
$a--;
}
if($p==3 && $c!=700 && $j==20)
{
$a--;
}
if($p==1 && $c!=800 && $j==19)
{
$a--;
}
if($p==2 && $c!=900 && $j==18)
{
$a--;
}
}
}
}
}
printf("a=%d\n",$a);

exit(0);


?>


c-prog :

main()
{

int a,r,p,z,j,c;

a=0;
r=100;

for(p=1;p<=3;p++)
{
for (c=1; c<=1230; c++)
{
for (j=0;j<=23;j++)
{
for (z=0; z<=r; z++)
{
a++;
if(p==1 && c!=500 && j==22)
{
a--;
}
if(p==2 && c!=600 && j==21)
{
a--;
}
if(p==3 && c!=700 && j==20)
{
a--;
}
if(p==1 && c!=800 && j==19)
{
a--;
}
if(p==2 && c!=900 && j==18)
{
a--;
}
}
}
}
}
printf("a=%d\n",a);

exit(0);

}

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