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Add solution 166.

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src/Algorithms/0166.fraction-to-recurring-decimal
- fraction-to-recurring-decimal.php

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	`1`	`+class Solution {`
	`2`	`+`
	`3`	`+ /**`
	`4`	`+ * @param Integer $numerator`
	`5`	`+ * @param Integer $denominator`
	`6`	`+ * @return String`
	`7`	`+ */`
	`8`	`+ function fractionToDecimal($num1, $deno1) {`
	`9`	`+ $neg = $num1 > 0 && $deno1 < 0 \|\| $num1 < 0 && $deno1 > 0;`
	`10`	`+ $ret = $neg ? "-":"";`
	`11`	`+ $num = abs($num1);`
	`12`	`+ $deno = abs($deno1);`
	`13`	`+`
	`14`	`+`
	`15`	`+ $p1 = intval($num/$deno);`
	`16`	`+ $remain = $num%$deno;`
	`17`	`+ if($remain == 0) return $ret . $p1;`
	`18`	`+`
	`19`	`+ $map = [];`
	`20`	`+ $sb = "";`
	`21`	`+`
	`22`	`+ $start = -1;`
	`23`	`+ $end = -1;`
	`24`	`+ $map[$remain] = 0;`
	`25`	`+ echo($sb);`
	`26`	`+ while($remain != 0) {`
	`27`	`+ $remain *= 10;`
	`28`	`+ while($remain < $deno) {`
	`29`	`+ $sb .= '0';`
	`30`	`+ $map[$remain] = strlen($sb);`
	`31`	`+ $remain *= 10;`
	`32`	`+ }`
	`33`	`+`
	`34`	`+ $res = intval($remain/$deno);`
	`35`	`+ $sb = $sb . chr($res + ord('0'));`
	`36`	`+`
	`37`	`+ $remain %= $deno;`
	`38`	`+ if($remain == 0) break;`
	`39`	`+`
	`40`	`+ $len = strlen($sb);`
	`41`	`+ if(array_key_exists($remain, $map)) {`
	`42`	`+ $start = $map[$remain];`
	`43`	`+ break;`
	`44`	`+ } else {`
	`45`	`+ $map[$remain] = $len;`
	`46`	`+ }`
	`47`	`+ }`
	`48`	`+`
	`49`	`+ $ret = $ret . $p1 . ".";`
	`50`	`+ if($start == -1) {`
	`51`	`+ $ret .= $sb;`
	`52`	`+ } else {`
	`53`	`+ $ret = $ret . substr($sb, 0, $start) . "(" . substr($sb, $start) . ")";`
	`54`	`+ }`
	`55`	`+`
	`56`	`+ return $ret;`
	`57`	`+ }`
	`58`	`+}`

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