Can't get the hang of 'eval()'...

lucianoes

Dear friends,

I have the following function:

<?php
function Output () {
global $cond1, $cond2, $cond3, $val1, $val2, $val3, $output1, $output2, $output3, $output4;
if ($cond1 == $val1)
{print "output 1"; $output1;}
elseif ($cond2 == $val2)
{print "output 2"; $output2;}
elseif ($cond3 == $val3)
{print "output 3"; $output3;}
else print "output 4"; $output4;
} // end function Output;
?>

The 'print "$output #"' part is there for debugging only.

Later on, I assign values to the conditions, values and outputs and call the function with eval:

<?php
eval("print Generate();");
?>

That is causing all 4 possible outputs to be printed. The test prints (print output #), however, are not all printed. Only one is printed and usually not the one I expect. I confess I'm finding it hard to get the hang of 'eval'. Can someone please enlighten me?

    Thank you,
    Luciano ES
    Santos - SP - Brasil

wadearnold

Can you please post the code from the calling page that had the eval function. That will help
cheers;
wade

lucianoes

I'm afraid I can't do it anymore. I've changed the page so much since I posted my request for help that now I don't remember what it was like then.

I'm still using eval. I still find it a little difficult to understand, but now it works the way I am using it:

<?php
function Generate () {

if ($cond1 == $val1) {eval ($output1);}
elseif ($cond2 == $val2) {eval ($output2);}
elseif ($cond3 == $val3) {eval ($output3);}
else {eval ($output4);}
}

$cond1=in_array ($page, $frameset); $val1='1';
$output1='print "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Frameset//EN\">";';
$cond2=$mode; $val2='noframes';
$output2='print "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\">";';
$output3='print "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">";';
Generate();

// function is repeated many times then...
?>

Thank you anyway,
Luciano ES
Santos - SP - Brasil