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添加0055.右旋字符串.md PHP版本

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Original file line number	Diff line number	Diff line change
`@@ -23,7 +23,7 @@`
`23`	`23`	```
`24`	`24`	`2`
`25`	`25`	`abcdefg`
`26`		-```
	`26`	+```
`27`	`27`
`28`	`28`	`样例输出:`
`29`	`29`
`@@ -336,6 +336,32 @@ var reverseLeftWords = function(s, n) {`
`336`	`336`
`337`	`337`	`### PHP:`
`338`	`338`
	`339`	+```php
	`340`	`+<?php`
	`341`	`+// 反转函数`
	`342`	`+function reverse(&$s, $start, $end) {`
	`343`	`+ for ($i = $start, $j = $end; $i < $j; $i++, $j--) {`
	`344`	`+ $tmp = $s[$i];`
	`345`	`+ $s[$i] = $s[$j];`
	`346`	`+ $s[$j] = $tmp;`
	`347`	`+ }`
	`348`	`+}`
	`349`	`+`
	`350`	`+// 标准输入:读取右旋转位数和字符串`
	`351`	`+$n = trim(fgets(STDIN));`
	`352`	`+$s = trim(fgets(STDIN));`
	`353`	`+// 字符串长度`
	`354`	`+$len = strlen($s);`
	`355`	`+// 先部分反转`
	`356`	`+reverse($s, $len - $n, $len - 1);`
	`357`	`+reverse($s, 0, $len - $n - 1);`
	`358`	`+// 再整体反转`
	`359`	`+reverse($s, 0, $len - 1);`
	`360`	`+`
	`361`	`+echo $s;`
	`362`	`+?>`
	`363`	+```
	`364`	`+`
`339`	`365`
`340`	`366`	`### Scala:`
`341`	`367`
`@@ -349,3 +375,4 @@ var reverseLeftWords = function(s, n) {`
`349`	`375`	`<a href="https://programmercarl.com/other/kstar.html" target="_blank">`
`350`	`376`	`<img src="../pics/网站星球宣传海报.jpg" width="1000"/>`
`351`	`377`	`</a>`
	`378`	`+`

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