feat: add php solution to lc problem: No.1475 (doocs#1021)

Author: Qiu-IT

solution/1400-1499/1475.Final Prices With a Special Discount in a Shop/README.md

@@ -370,6 +370,28 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param Integer[] $prices
+     * @return Integer[]
+     */
+    function finalPrices($prices) {
+        for ($i = 0; $i < count($prices); $i++) {
+            for ($j = $i + 1; $j < count($prices); $j++) {
+                if ($prices[$i] >= $prices[$j]) {
+                    $prices[$i] -= $prices[$j];
+                    break;
+                }
+            }
+        }
+        return $prices;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/1400-1499/1475.Final Prices With a Special Discount in a Shop/README_EN.md

@@ -341,6 +341,28 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param Integer[] $prices
+     * @return Integer[]
+     */
+    function finalPrices($prices) {
+        for ($i = 0; $i < count($prices); $i++) {
+            for ($j = $i + 1; $j < count($prices); $j++) {
+                if ($prices[$i] >= $prices[$j]) {
+                    $prices[$i] -= $prices[$j];
+                    break;
+                }
+            }
+        }
+        return $prices;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/1400-1499/1475.Final Prices With a Special Discount in a Shop/Solution.php

@@ -0,0 +1,17 @@
+class Solution {
+    /**
+     * @param Integer[] $prices
+     * @return Integer[]
+     */
+    function finalPrices($prices) {
+        for ($i = 0; $i < count($prices); $i++) {
+            for ($j = $i + 1; $j < count($prices); $j++) {
+                if ($prices[$i] >= $prices[$j]) {
+                    $prices[$i] -= $prices[$j];
+                    break;
+                }
+            }
+        }
+        return $prices;
+    }
+}