feat: add php solution to lc problem: No.1456 (#1083)

Author: Qiu-IT

solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/README.md

@@ -203,6 +203,45 @@ function maxVowels(s: string, k: number): number {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @param Integer $k
+     * @return Integer
+     */
+    function isVowel($c) {
+        return $c === 'a' ||
+            $c === 'e' ||
+            $c === 'i' ||
+            $c === 'o' ||
+            $c === 'u';
+    }
+    function maxVowels($s, $k) {
+        $cnt = 0;
+        $rs = 0;
+        for ($i = 0; $i < $k; $i++) {
+            if ($this->isVowel($s[$i])) {
+                $cnt++;
+            }
+        }
+        $rs = $cnt;
+        for ($j = $k; $j < strlen($s); $j++) {
+            if ($this->isVowel($s[$j - $k])) {
+                $cnt--;
+            }
+            if ($this->isVowel($s[$j])) {
+                $cnt++;
+            }
+            $rs = max($rs, $cnt);
+        }
+        return $rs;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/README_EN.md

@@ -175,6 +175,43 @@ function maxVowels(s: string, k: number): number {
 }
 ```
 
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @param Integer $k
+     * @return Integer
+     */
+    function isVowel($c) {
+        return $c === 'a' ||
+            $c === 'e' ||
+            $c === 'i' ||
+            $c === 'o' ||
+            $c === 'u';
+    }
+    function maxVowels($s, $k) {
+        $cnt = 0;
+        $rs = 0;
+        for ($i = 0; $i < $k; $i++) {
+            if ($this->isVowel($s[$i])) {
+                $cnt++;
+            }
+        }
+        $rs = $cnt;
+        for ($j = $k; $j < strlen($s); $j++) {
+            if ($this->isVowel($s[$j - $k])) {
+                $cnt--;
+            }
+            if ($this->isVowel($s[$j])) {
+                $cnt++;
+            }
+            $rs = max($rs, $cnt);
+        }
+        return $rs;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/Solution.php

@@ -0,0 +1,34 @@
+class Solution {
+    /**
+     * @param String $s
+     * @param Integer $k
+     * @return Integer
+     */
+    function isVowel($c) {
+        return $c === 'a' ||
+            $c === 'e' ||
+            $c === 'i' ||
+            $c === 'o' ||
+            $c === 'u';
+    }
+    function maxVowels($s, $k) {
+        $cnt = 0;
+        $rs = 0;
+        for ($i = 0; $i < $k; $i++) {
+            if ($this->isVowel($s[$i])) {
+                $cnt++;
+            }
+        }
+        $rs = $cnt;
+        for ($j = $k; $j < strlen($s); $j++) {
+            if ($this->isVowel($s[$j - $k])) {
+                $cnt--;
+            }
+            if ($this->isVowel($s[$j])) {
+                $cnt++;
+            }
+            $rs = max($rs, $cnt);
+        }
+        return $rs;
+    }
+}