how to use eval();

well.. i know about the eval(); function..

but how do i use it ??

??

Well I'm not sure what language you are referring to, but the implementation will be relatively the same in any language that supports it. The following example would be a use in ASP:

Firstly, its the php eval function, say if you have a var like this

$var = "<?php echo '$test' ?>";

now if you printed this out, you would get something like this

<?php echo '$test' ?>

but if you eval, that would actually parse that code, i think, correct me if im wrong

also trying to use eval() for php but am having difficulties figuring out its syntax

in CF i can do this:
<cfset x='abc'>
<cfset y='2'>
<cfset z='3'>
<cfoutput>
#x# is the same as #evaluate(x)#
and
#abc_2# is the same as #evaluate(x & '_' & '2')#
<!--- The value of 'abc_2' is output the same regardless of method used --->
</cfoutput>

How is the evaluate(x & '_' & '2') expression created in PHP ?
(x is a variable, _ and 2 are known strings)

Thanks,

- Joe