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Add solution 150.

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src/Algorithms/0150.evaluate-reverse-polish-notation
- evaluate-reverse-polish-notation.php

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	`1`	`+class Solution {`
	`2`	`+`
	`3`	`+ /**`
	`4`	`+ * @param String[] $tokens`
	`5`	`+ * @return Integer`
	`6`	`+ */`
	`7`	`+ function evalRPN($tokens) {`
	`8`	`+ $stack = [];`
	`9`	`+ $conVal=0;`
	`10`	`+ $res=0;`
	`11`	`+`
	`12`	`+ if(count($tokens)<2)return intval($tokens[0]);`
	`13`	`+ foreach($tokens as $s){`
	`14`	`+ if(($s == "+") \|\| ($s == "-") \|\| ($s == "*") \|\| ($s == "/")){`
	`15`	`+ switch($s){`
	`16`	`+ case "+" : $res=array_pop($stack)+array_pop($stack);`
	`17`	`+ array_push($stack, $res);`
	`18`	`+ break;`
	`19`	`+ case "-" : $x = array_pop($stack);`
	`20`	`+ $y = array_pop($stack);`
	`21`	`+ $res=$y-$x;`
	`22`	`+ array_push($stack, $res);`
	`23`	`+ break;`
	`24`	`+ case "" : $res=array_pop($stack)array_pop($stack);`
	`25`	`+ array_push($stack, $res);`
	`26`	`+ break;`
	`27`	`+ case "/" : $a = array_pop($stack);`
	`28`	`+ $b = array_pop($stack);`
	`29`	`+ if($b==0)$res=0;`
	`30`	`+ else $res=intval($b/$a);`
	`31`	`+ array_push($stack, $res);`
	`32`	`+ break;`
	`33`	`+ }`
	`34`	`+ }`
	`35`	`+ else{`
	`36`	`+ $conVal = intval($s);`
	`37`	`+ array_push($stack, $conVal);`
	`38`	`+ }`
	`39`	`+ }`
	`40`	`+ return $res;`
	`41`	`+ }`
	`42`	`+}`

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