note 35822 rejected from language.variables.variable by didou

Note Submitter: frank@vista.com ---- Variable variables let you assign values to invalid variable names (those with hyphens, dots, etc.). $foo = "invalid-variable"; $$foo = "value of invalid variable"; How do you access them once you've done this? echo ${"invalid-variable"}; // value of invalid variable Note that this works with registered globals (i.e. script.php?invalid-variable=value+of+invalid+variable) although dots are converted to underscores for query parameter names. Basically, any valid or invalid variable name can be used, as long as it's in quotes and braces: $foo = '4site'; $$foo = 'not yet'; echo ${'4site'} // not yet