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feat: add php solution to lc problem: No.2485 (#1142)

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Lines changed: 22 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -201,6 +201,28 @@ function pivotInteger(n: number): number {`
`201`	`201`	`}`
`202`	`202`	```
`203`	`203`
	`204`	`+### PHP`
	`205`	`+`
	`206`	+```php
	`207`	`+class Solution {`
	`208`	`+ /**`
	`209`	`+ * @param Integer $n`
	`210`	`+ * @return Integer`
	`211`	`+ */`
	`212`	`+ function pivotInteger($n) {`
	`213`	`+ $sum = ($n * ($n + 1)) / 2;`
	`214`	`+ $pre = 0;`
	`215`	`+ for ($i = 1; $i <= $n; $i++) {`
	`216`	`+ if ($pre + $i === $sum - $pre) {`
	`217`	`+ return $i;`
	`218`	`+ }`
	`219`	`+ $pre += $i;`
	`220`	`+ }`
	`221`	`+ return -1;`
	`222`	`+ }`
	`223`	`+}`
	`224`	+```
	`225`	`+`
`204`	`226`	`### ...`
`205`	`227`
`206`	`228`	```

Lines changed: 22 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -164,6 +164,28 @@ function pivotInteger(n: number): number {`
`164`	`164`	`}`
`165`	`165`	```
`166`	`166`
	`167`	`+### PHP`
	`168`	`+`
	`169`	+```php
	`170`	`+class Solution {`
	`171`	`+ /**`
	`172`	`+ * @param Integer $n`
	`173`	`+ * @return Integer`
	`174`	`+ */`
	`175`	`+ function pivotInteger($n) {`
	`176`	`+ $sum = ($n * ($n + 1)) / 2;`
	`177`	`+ $pre = 0;`
	`178`	`+ for ($i = 1; $i <= $n; $i++) {`
	`179`	`+ if ($pre + $i === $sum - $pre) {`
	`180`	`+ return $i;`
	`181`	`+ }`
	`182`	`+ $pre += $i;`
	`183`	`+ }`
	`184`	`+ return -1;`
	`185`	`+ }`
	`186`	`+}`
	`187`	+```
	`188`	`+`
`167`	`189`	`### ...`
`168`	`190`
`169`	`191`	```

Lines changed: 17 additions & 0 deletions

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