feat: add php solution to lc problem: No.1455 (doocs#990)

Author: Qiu-IT

solution/1400-1499/1455.Check If a Word Occurs As a Prefix of Any Word in a Sentence/README.md

@@ -154,6 +154,25 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $sentence
+     * @param String $searchWord
+     * @return Integer
+     */
+    function isPrefixOfWord($sentence, $searchWord) {
+        $arr = explode(" ", $sentence);
+        for ($i = 0; $i < count($arr); $i++) {
+            if (strpos($arr[$i], $searchWord) === 0) return $i + 1;
+        }
+        return -1;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/1400-1499/1455.Check If a Word Occurs As a Prefix of Any Word in a Sentence/README_EN.md

@@ -138,6 +138,25 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $sentence
+     * @param String $searchWord
+     * @return Integer
+     */
+    function isPrefixOfWord($sentence, $searchWord) {
+        $arr = explode(" ", $sentence);
+        for ($i = 0; $i < count($arr); $i++) {
+            if (strpos($arr[$i], $searchWord) === 0) return $i + 1;
+        }
+        return -1;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/1400-1499/1455.Check If a Word Occurs As a Prefix of Any Word in a Sentence/Solution.php

@@ -0,0 +1,14 @@
+class Solution {
+    /**
+     * @param String $sentence
+     * @param String $searchWord
+     * @return Integer
+     */
+    function isPrefixOfWord($sentence, $searchWord) {
+        $arr = explode(" ", $sentence);
+        for ($i = 0; $i < count($arr); $i++) {
+            if (strpos($arr[$i], $searchWord) === 0) return $i + 1;
+        }
+        return -1;
+    }
+}