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Merge pull request youngyangyang04#1339 from fmtvar/offer58-2

添加(剑指Offer58-II.左旋转字符串.md):增加PHP版本

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`@@ -290,6 +290,28 @@ func reverseString(_ s: inout [Character], startIndex: Int, endIndex: Int) {`
`290`	`290`	`}`
`291`	`291`	```
`292`	`292`
	`293`	`+`
	`294`	`+### PHP`
	`295`	`+`
	`296`	+```php
	`297`	`+function reverseLeftWords($s, $n) {`
	`298`	`+ $this->reverse($s,0,$n-1); //反转区间为前n的子串`
	`299`	`+ $this->reverse($s,$n,strlen($s)-1); //反转区间为n到末尾的子串`
	`300`	`+ $this->reverse($s,0,strlen($s)-1); //反转整个字符串`
	`301`	`+ return $s;`
	`302`	`+}`
	`303`	`+`
	`304`	`+// 按指定进行翻转【array、string都可】`
	`305`	`+function reverse(&$s, $start, $end) {`
	`306`	`+ for ($i = $start, $j = $end; $i < $j; $i++, $j--) {`
	`307`	`+ $tmp = $s[$i];`
	`308`	`+ $s[$i] = $s[$j];`
	`309`	`+ $s[$j] = $tmp;`
	`310`	`+ }`
	`311`	`+}`
	`312`	+```
	`313`	`+`
	`314`	`+`
`293`	`315`	`Scala:`
`294`	`316`
`295`	`317`	```scala
`@@ -322,5 +344,6 @@ object Solution {`
`322`	`344`
`323`	`345`
`324`	`346`
	`347`	`+`
`325`	`348`	`-----------------------`
`326`	`349`	`<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>`

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