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feat: add php solution to lc problem: No.1941 (#1029)

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solution/1900-1999/1941.Check if All Characters Have Equal Number of Occurrences

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Original file line number	Diff line number	Diff line change
`@@ -156,6 +156,24 @@ function areOccurrencesEqual(s: string): boolean {`
`156`	`156`	`}`
`157`	`157`	```
`158`	`158`
	`159`	`+### PHP`
	`160`	`+`
	`161`	+```php
	`162`	`+class Solution {`
	`163`	`+ /**`
	`164`	`+ * @param String $s`
	`165`	`+ * @return Boolean`
	`166`	`+ */`
	`167`	`+ function areOccurrencesEqual($s) {`
	`168`	`+ for ($i = 0; $i < strlen($s); $i++) {`
	`169`	`+ $hashtable[$s[$i]] += 1;`
	`170`	`+ }`
	`171`	`+ $rs = array_unique($hashtable);`
	`172`	`+ return count($rs) === 1;`
	`173`	`+ }`
	`174`	`+}`
	`175`	+```
	`176`	`+`
`159`	`177`	`### ...`
`160`	`178`
`161`	`179`	```

Lines changed: 18 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -140,6 +140,24 @@ function areOccurrencesEqual(s: string): boolean {`
`140`	`140`	`}`
`141`	`141`	```
`142`	`142`
	`143`	`+### PHP`
	`144`	`+`
	`145`	+```php
	`146`	`+class Solution {`
	`147`	`+ /**`
	`148`	`+ * @param String $s`
	`149`	`+ * @return Boolean`
	`150`	`+ */`
	`151`	`+ function areOccurrencesEqual($s) {`
	`152`	`+ for ($i = 0; $i < strlen($s); $i++) {`
	`153`	`+ $hashtable[$s[$i]] += 1;`
	`154`	`+ }`
	`155`	`+ $rs = array_unique($hashtable);`
	`156`	`+ return count($rs) === 1;`
	`157`	`+ }`
	`158`	`+}`
	`159`	+```
	`160`	`+`
`143`	`161`	`### ...`
`144`	`162`
`145`	`163`	```

Lines changed: 13 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,13 @@`
	`1`	`+class Solution {`
	`2`	`+ /**`
	`3`	`+ * @param String $s`
	`4`	`+ * @return Boolean`
	`5`	`+ */`
	`6`	`+ function areOccurrencesEqual($s) {`
	`7`	`+ for ($i = 0; $i < strlen($s); $i++) {`
	`8`	`+ $hashtable[$s[$i]] += 1;`
	`9`	`+ }`
	`10`	`+ $rs = array_unique($hashtable);`
	`11`	`+ return count($rs) === 1;`
	`12`	`+ }`
	`13`	`+}`

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