Commit 1b11695

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Add solution 179.

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	`1`	`+class Solution {`
	`2`	`+`
	`3`	`+ function cmp($str1, $str2) {`
	`4`	`+ $s1 = $str1 . $str2;`
	`5`	`+ $s2 = $str2 . $str1;`
	`6`	`+ return strcmp($s2, $s1);`
	`7`	`+ }`
	`8`	`+`
	`9`	`+ /**`
	`10`	`+ * @param Integer[] $nums`
	`11`	`+ * @return String`
	`12`	`+ */`
	`13`	`+ function largestNumber($nums) {`
	`14`	`+ $strs = array_fill(0, count($nums), "");`
	`15`	`+ for ($i=0; $i<count($nums); $i++) {`
	`16`	`+ $strs[$i] = "" . $nums[$i];`
	`17`	`+ }`
	`18`	`+`
	`19`	`+ usort($strs, 'self::cmp');`
	`20`	`+`
	`21`	`+ if ($strs[0] == "0") {`
	`22`	`+ return "0";`
	`23`	`+ }`
	`24`	`+`
	`25`	`+ $sb = "";`
	`26`	`+ foreach ($strs as $str) {`
	`27`	`+ $sb .= $str;`
	`28`	`+ }`
	`29`	`+`
	`30`	`+ return $sb;`
	`31`	`+ }`
	`32`	`+}`

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