How does PHP handle variable variables when used with arrays, and what syntax should be used to avoid ambiguity?

When using variable variables with arrays in PHP, there can be ambiguity if the variable variable name is similar to the array key. To avoid this ambiguity, you can enclose the variable variable name in curly braces when accessing array elements. 

$var = 'foo';
$foo = 'bar';
$array = ['foo' => 'baz'];

// Ambiguous syntax
echo $$array[$var]; // Outputs 'baz'

// Avoid ambiguity by using curly braces
echo ${$array[$var]}; // Outputs 'bar'

Keywords

PHP variable variables arrays syntax ambiguity

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