NYCPHP Meetup

[drydell at optonline.net]

> Where the calc_str comes first at design time, while $x and $y 
> are determined at run time. With this restriction using double 
> quotes "$x * $y" in the proposed solution below will not work either.
> 

you can escape the $ in double quotes to represent the literal $var instead of the variable $var - "\$x * \$y"
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