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feat: add php solutions to lc problem: No.0001 (doocs#896)

No.0001.Two Sum

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Original file line number	Diff line number	Diff line change
`@@ -230,7 +230,29 @@ proc twoSum(nums: seq[int], target: int): seq[int] =`
`230`	`230`	`tdx = nums.find(bal)`
`231`	`231`	`if idx != tdx:`
`232`	`232`	`return @[idx, tdx]`
	`233`	+```
	`234`	`+`
	`235`	`+### PHP`
	`236`	`+`
	`237`	+```php
	`238`	`+class Solution {`
`233`	`239`
	`240`	`+ /**`
	`241`	`+ * @param Integer[] $nums`
	`242`	`+ * @param Integer $target`
	`243`	`+ * @return Integer[]`
	`244`	`+ */`
	`245`	`+ function twoSum($nums, $target) {`
	`246`	`+ $len = count($nums);`
	`247`	`+ for ($i = 0; $i < $len; $i++) {`
	`248`	`+ for ($j = 1 + $i; $j < $len; $j++) {`
	`249`	`+ if ($nums[$i] + $nums[$j] == $target) {`
	`250`	`+ return [$i, $j];`
	`251`	`+ }`
	`252`	`+ }`
	`253`	`+ }`
	`254`	`+ }`
	`255`	`+}`
`234`	`256`	```
`235`	`257`
`236`	`258`	`### ...`

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Original file line number	Diff line number	Diff line change
`@@ -211,7 +211,29 @@ proc twoSum(nums: seq[int], target: int): seq[int] =`
`211`	`211`	`tdx = nums.find(bal)`
`212`	`212`	`if idx != tdx:`
`213`	`213`	`return @[idx, tdx]`
	`214`	+```
	`215`	`+`
	`216`	`+### PHP`
	`217`	`+`
	`218`	+```php
	`219`	`+class Solution {`
`214`	`220`
	`221`	`+ /**`
	`222`	`+ * @param Integer[] $nums`
	`223`	`+ * @param Integer $target`
	`224`	`+ * @return Integer[]`
	`225`	`+ */`
	`226`	`+ function twoSum($nums, $target) {`
	`227`	`+ $len = count($nums);`
	`228`	`+ for ($i = 0; $i < $len; $i++) {`
	`229`	`+ for ($j = 1 + $i; $j < $len; $j++) {`
	`230`	`+ if ($nums[$i] + $nums[$j] == $target) {`
	`231`	`+ return [$i, $j];`
	`232`	`+ }`
	`233`	`+ }`
	`234`	`+ }`
	`235`	`+ }`
	`236`	`+}`
`215`	`237`	```
`216`	`238`
`217`	`239`	`### ...`

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