If safe mode, the popen command search the '/' character to
detect the presence of a path in the command to exec. This is
OK, but has a problem; if you execute a command with parameters,
for example:
  $fp=popen("ls dir/dir2","r")

it will fail because it will replace "ls dir" by the path to the
secure dir, trying to execute "dir2" from this.

I wrote a path to correct this problem; this patch must be
applied to file functions/file.c (where php3_popen function
lives)

The patch:

--------------------- CUT HERE -------------------------


309c309,316
< 	b = strrchr(arg1->value.str.val,'/');
---
> 	b = strchr(arg1->value.str.val,' ');
> 	if(!b) {
> 		b = strrchr(arg1->value.str.val,'/');
> 	} else {
> 		c = arg1->value.str.val;
> 		while((*b!='/')&&(b!=c)) b--;
> 		if(b==c) b=NULL;
> 	}

--------------------- CUT HERE -------------------------