public static function visitInParallel($visitors)
    {
        $visitorsCount = count($visitors);
        $skipping      = new SplFixedArray($visitorsCount);

        return [
            'enter' => static function (Node $node) use ($visitors, $skipping, $visitorsCount) {
                for ($i = 0; $i < $visitorsCount; $i++) {
                    if (! empty($skipping[$i])) {
                        continue;
                    }

                    $fn = self::getVisitFn(
                        $visitors[$i],
                        $node->kind, /* isLeaving */
                        false
                    );

                    if (! $fn) {
                        continue;
                    }

                    $result = call_user_func_array($fn, func_get_args());

                    if ($result instanceof VisitorOperation) {
                        if ($result->doContinue) {
                            $skipping[$i] = $node;
                        } elseif ($result->doBreak) {
                            $skipping[$i] = $result;
                        } elseif ($result->removeNode) {
                            return $result;
                        }
                    } elseif ($result !== null) {
                        return $result;
                    }
                }
            },
            'leave' => static function (Node $node) use ($visitors, $skipping, $visitorsCount) {
                for ($i = 0; $i < $visitorsCount; $i++) {
                    if (empty($skipping[$i])) {
                        $fn = self::getVisitFn(
                            $visitors[$i],
                            $node->kind, /* isLeaving */
                            true
                        );

                        if ($fn) {
                            $result = call_user_func_array($fn, func_get_args());
                            if ($result instanceof VisitorOperation) {
                                if ($result->doBreak) {
                                    $skipping[$i] = $result;
                                } elseif ($result->removeNode) {
                                    return $result;
                                }
                            } elseif ($result !== null) {
                                return $result;
                            }
                        }
                    } elseif ($skipping[$i] === $node) {
                        $skipping[$i] = null;
                    }
                }
            },
        ];
    }
public static function visitInParallel($visitors)
    {
        $visitorsCount = count($visitors);
        $skipping      = new SplFixedArray($visitorsCount);

        return [
            'enter' => static function (Node $node) use ($visitors, $skipping, $visitorsCount) {
                for ($i = 0; $i < $visitorsCount; $i++) {
                    if (! empty($skipping[$i])) {
                        continue;
                    }

                    $fn = self::getVisitFn(
                        $visitors[$i],
                        $node->kind, 
                        false
                    );

                    if (! $fn) {
                        continue;
                    }

                    $result = call_user_func_array($fn, func_get_args());

                    if ($result instanceof VisitorOperation) {
                        if ($result->doContinue) {
                            $skipping[$i] = $node;
                        } elseif ($result->doBreak) {
                            $skipping[$i] = $result;
                        } elseif ($result->removeNode) {
                            return $result;
                        }
                    } elseif ($result !== null) {
                        return $result;
                    }
                }
            },
            'leave' => static function (Node $node) use ($visitors, $skipping, $visitorsCount) {
                for ($i = 0; $i < $visitorsCount; $i++) {
                    if (empty($skipping[$i])) {
                        $fn = self::getVisitFn(
                            $visitors[$i],
                            $node->kind, 
                            true
                        );

                        if ($fn) {
                            $result = call_user_func_array($fn, func_get_args());
                            if ($result instanceof VisitorOperation) {
                                if ($result->doBreak) {
                                    $skipping[$i] = $result;
                                } elseif ($result->removeNode) {
                                    return $result;
                                }
                            } elseif ($result !== null) {
                                return $result;
                            }
                        }
                    } elseif ($skipping[$i] === $node) {
                        $skipping[$i] = null;
                    }
                }
            },
        ];
    }
public static function visitInParallel ( $ visitors ) { $ visitorsCount = count ( $ visitors ) ; $ skipping = new SplFixedArray ( $ visitorsCount ) ; return [ 'enter' => static function ( Node $ node ) use ( $ visitors , $ skipping , $ visitorsCount ) { for ( $ i = 0 ; $ i < $ visitorsCount ; $ i ++ ) { if ( ! empty ( $ skipping [ $ i ] ) ) { continue ; } $ fn = self :: getVisitFn ( $ visitors [ $ i ] , $ node -> kind , /* isLeaving */ false ) ; if ( ! $ fn ) { continue ; } $ result = call_user_func_array ( $ fn , func_get_args ( ) ) ; if ( $ result instanceof VisitorOperation ) { if ( $ result -> doContinue ) { $ skipping [ $ i ] = $ node ; } elseif ( $ result -> doBreak ) { $ skipping [ $ i ] = $ result ; } elseif ( $ result -> removeNode ) { return $ result ; } } elseif ( $ result !== null ) { return $ result ; } } } , 'leave' => static function ( Node $ node ) use ( $ visitors , $ skipping , $ visitorsCount ) { for ( $ i = 0 ; $ i < $ visitorsCount ; $ i ++ ) { if ( empty ( $ skipping [ $ i ] ) ) { $ fn = self :: getVisitFn ( $ visitors [ $ i ] , $ node -> kind , /* isLeaving */ true ) ; if ( $ fn ) { $ result = call_user_func_array ( $ fn , func_get_args ( ) ) ; if ( $ result instanceof VisitorOperation ) { if ( $ result -> doBreak ) { $ skipping [ $ i ] = $ result ; } elseif ( $ result -> removeNode ) { return $ result ; } } elseif ( $ result !== null ) { return $ result ; } } } elseif ( $ skipping [ $ i ] === $ node ) { $ skipping [ $ i ] = null ; } } } , ] ; }
@param callable[][] $visitors

@return callable[][]
@param callable [] [] $visitors