DeferredStringifier.php

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<?php
class DeferredStringifier {
    private $callback;
 
    private $params;
 
    private $result;
 
    public function __construct( $callback /*...*/ ) {
        $this->params = func_get_args();
        array_shift( $this->params );
        $this->callback = $callback;
    }
 
    public function __toString() {
        if ( $this->result === null ) {
            $this->result = call_user_func_array( $this->callback, $this->params );
        }
        return $this->result;
    }
}