feat: add php solution to lc problem: No.1957 (doocs#1015)

Author: Qiu-IT

solution/1900-1999/1957.Delete Characters to Make Fancy String/README.md

@@ -126,6 +126,25 @@ func makeFancyString(s string) string {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @return String
+     */
+    function makeFancyString($s) {
+        $rs = "";
+        for ($i = 0; $i < strlen($s); $i++) {
+            if ($s[$i] == $s[$i + 1] && $s[$i] == $s[$i + 2]) continue;
+            else $rs .= $s[$i];
+        }
+        return $rs;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/1900-1999/1957.Delete Characters to Make Fancy String/README_EN.md

@@ -116,6 +116,25 @@ func makeFancyString(s string) string {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @return String
+     */
+    function makeFancyString($s) {
+        $rs = "";
+        for ($i = 0; $i < strlen($s); $i++) {
+            if ($s[$i] == $s[$i + 1] && $s[$i] == $s[$i + 2]) continue;
+            else $rs .= $s[$i];
+        }
+        return $rs;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/1900-1999/1957.Delete Characters to Make Fancy String/Solution.php

@@ -0,0 +1,14 @@
+class Solution {
+    /**
+     * @param String $s
+     * @return String
+     */
+    function makeFancyString($s) {
+        $rs = "";
+        for ($i = 0; $i < strlen($s); $i++) {
+            if ($s[$i] == $s[$i + 1] && $s[$i] == $s[$i + 2]) continue;
+            else $rs .= $s[$i];
+        }
+        return $rs;
+    }
+}