diff --git a/solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/README.md b/solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/README.md
index 94b7d19927ee3..969566f28d1d4 100644
--- a/solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/README.md	
+++ b/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;
+    }
+}
+```
+
 ### **...**
 
 ```
diff --git a/solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/README_EN.md b/solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/README_EN.md
index 4b03b76e29610..7c162ad586429 100644
--- a/solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/README_EN.md	
+++ b/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;
+    }
+}
+```
+
 ### **...**
 
 ```
diff --git a/solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/Solution.php b/solution/1400-1499/1456.Maximum Number of Vowels in a Substring of Given Length/Solution.php
new file mode 100644
index 0000000000000..67c6615305982
--- /dev/null
+++ b/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;
+    }
+}