How does PHP handle variable scope and naming conflicts when using $$var or ${$var} notation?

When using $$var or ${$var} notation in PHP, the variable scope and naming conflicts are handled by following the variable variable rules. PHP will first look for the variable named by the value of $var within the current scope. If it doesn't find it, it will look for it in the global scope. To avoid naming conflicts, it's recommended to use unique variable names to prevent unexpected behavior. 

$var = 'foo';
$$var = 'bar';

echo $foo; // Outputs 'bar'

Keywords

PHP variable scope naming conflicts variable variables curly braces

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