creating dynamic php-code (eval)

[dantea]

Hello...

I've got a problem on getting a variable content interpreted/inserted as php-code in one of my scripts.

For a class method i need two different ways of starting a loop while the content of these loops would be the same in both options. so i tried to put the header in a string, and evaluate it on execution, depending on whether a parameter was given or not. I tried to different methods of getting the command-string:with escaping the $'s, and without. But neither worked out. Here a code snippet of how i intend to use the above mentioned :

function create_tarray($inserttype="",$row="")
{
if ($row=="")
{
$checkcmd=eval("while($this->dbconnection->next_row()))";
//$checkcmd=eval("while(\$this->dbconnection->next_row()))";
}
else // in this case a two-dimensional array should have been given as parameter
{
$checkcmd=eval("foreach ($row as $array) ");
// $checkcmd=eval("foreach (\$row as \$array) "); // adjust checkcommand accordingly
}
eval($checkcmd); // this should be the loop-call
{
<...>

I would be happy about any suggestions on how i could get conditional-driven loop headers. Thank you in advance.

[Anon]

I don't understand why you need the eval().

[dantea]

Well, without eval, just putting the unescaped variables in place simply nothing happens. php just takes one run through the code block below the supposed-to-be loop header and thats it.

But I'd like it to place the loop-header contained in $checkcmd where i put the eval call in the snippet.

If i use eval, the only thing i get are errors. I thought i might have got the use of eval wrong, and it doesn't work out the way i like it to.