How long has the use of curly braces in PHP variable variables been supported in PHP versions?

The use of curly braces in PHP variable variables has been supported since PHP 4.3.0. This feature allows for dynamic variable names by using the value of a variable as the name of another variable. To implement this, simply enclose the variable name within curly braces to create a variable variable. 

$var = 'hello';
$$var = 'world';

echo ${$var}; // Output: world

Keywords

curly braces variable variables PHP versions supported syntax

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