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Add solution 116.

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src/Algorithms/0116.populating-next-right-pointers-in-each-node
- populating-next-right-pointers-in-each-node.php

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	`1`	`+/*`
	`2`	`+// Definition for a Node.`
	`3`	`+class Node {`
	`4`	`+ public $val;`
	`5`	`+ public $left;`
	`6`	`+ public $right;`
	`7`	`+ public $next;`
	`8`	`+`
	`9`	`+ @param Integer $val`
	`10`	`+ @param Node $left`
	`11`	`+ @param Node $right`
	`12`	`+ @param Node $next`
	`13`	`+ function __construct($val, $left, $right, $next) {`
	`14`	`+ $this->val = $val;`
	`15`	`+ $this->left = $left;`
	`16`	`+ $this->right = $right;`
	`17`	`+ $this->next = $next;`
	`18`	`+ }`
	`19`	`+}`
	`20`	`+*/`
	`21`	`+class Solution {`
	`22`	`+`
	`23`	`+ /**`
	`24`	`+ * @param Node $root`
	`25`	`+ * @return Node`
	`26`	`+ */`
	`27`	`+ function connect($root) {`
	`28`	`+ if($root==null){`
	`29`	`+ return null;`
	`30`	`+ }`
	`31`	`+`
	`32`	`+ if($root->left!=null && $root->right!=null){`
	`33`	`+ $root->left->next = $root->right;`
	`34`	`+ }`
	`35`	`+`
	`36`	`+ if($root->next!=null && $root->right!=null){`
	`37`	`+ $root->right->next=$root->next->left;`
	`38`	`+ }`
	`39`	`+`
	`40`	`+ self::connect($root->left);`
	`41`	`+ self::connect($root->right);`
	`42`	`+ return $root;`
	`43`	`+ }`
	`44`	`+}`

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