[PHP] php cli script with if-then's very slow

[Frans Fierens]

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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Re: [PHP] php cli script with if-then's very slow

[Richard Lynch]

On Thu, August 18, 2005 2:14 am, Frans Fierens wrote:
 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 ?

In the unlikely event that you ever need code like that in a real-life
application, write that part of your code in C as a Module for
Apache/PHP.

A cache like the Zend cache would maybe help a LITTLE as it will parse
it all to byte-code only once.  Though I suspect it won't help that
much, as it will still have run through that byte-code over and over.

Do feel free to write all your web server application in C if
performance is your primary consideration. :-)

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