feat: add php solution to lc problem: No.0014 (doocs#965)

Author: Qiu-IT

solution/0000-0099/0014.Longest Common Prefix/README.md

@@ -229,6 +229,27 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String[] $strs
+     * @return String
+     */
+    function longestCommonPrefix($strs) {
+        $rs = "";
+        for ($i = 0; $i < strlen($strs[0]); $i++) {
+            for ($j = 1; $j < count($strs); $j++) {
+                if ($strs[0][$i] != $strs[$j][$i]) return $rs;
+            }
+            $rs = $rs.$strs[0][$i];
+        }
+        return $rs;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0000-0099/0014.Longest Common Prefix/README_EN.md

@@ -220,6 +220,27 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String[] $strs
+     * @return String
+     */
+    function longestCommonPrefix($strs) {
+        $rs = "";
+        for ($i = 0; $i < strlen($strs[0]); $i++) {
+            for ($j = 1; $j < count($strs); $j++) {
+                if ($strs[0][$i] != $strs[$j][$i]) return $rs;
+            }
+            $rs = $rs.$strs[0][$i];
+        }
+        return $rs;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0000-0099/0014.Longest Common Prefix/Solution.php

@@ -0,0 +1,16 @@
+class Solution {
+    /**
+     * @param String[] $strs
+     * @return String
+     */
+    function longestCommonPrefix($strs) {
+        $rs = "";
+        for ($i = 0; $i < strlen($strs[0]); $i++) {
+            for ($j = 1; $j < count($strs); $j++) {
+                if ($strs[0][$i] != $strs[$j][$i]) return $rs;
+            }
+            $rs = $rs.$strs[0][$i];
+        }
+        return $rs;
+    }
+}