How to Create Recursive Anonymous Functions in PHP?

Creating Recursive Anonymous PHP Functions

It can be advantageous to create anonymous functions that are recursive in PHP. The code below demonstrates how to accomplish this, passing a function as a reference.

$factorial = function( $n ) use ( &$factorial ) {
    if( $n == 1 ) return 1;
    return $factorial( $n - 1 ) * $n;
};
print $factorial( 5 );

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