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Variable Variables with Classes - PHP

Quite possibly one of PHP’s least utilized yet most valuable features is its support for Variable Variables. In short these are a method of using the value of one variable to call the name of another. Sound confusing? We'll explain everything...

TABLE OF CONTENTS:
  1. Using Variable Variables in PHP
  2. Variable Variables?
  3. Using Variable Variables with Arrays
  4. Variable Variables with Functions
  5. Variable Variables with Classes
  6. The Never-ending Variable
  7. Conclusion
By: Eric Seufert
Rating: starstarstarstarstar / 15
February 14, 2001

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Variable Variables work equally well with class objects, the basic syntax of which is almost the same as the use of variable variables with functions. Set the class name into a variable, call the variable variable of that variable and you then have access to variables within that class. Here’s an example:

class Eric { var $foo = "bar"; } $Eric = new Eric; $v = "Eric"; echo $$v->foo;

the output of which would be:

bar




 
 
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