feat: add php solution to lc problem: No.0387 (doocs#943)

No.0387.First Unique Character in a String

Author: Qiu-IT

solution/0300-0399/0387.First Unique Character in a String/README.md

@@ -153,6 +153,31 @@ var firstUniqChar = function (s) {
 };
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @return Integer
+     */
+    function firstUniqChar($s) {
+        $hashmap = [];
+        for ($i = 0; $i < strlen($s); $i++) {
+            $word = $s[$i];
+            $hasmap[$word] += 1;
+        }
+        for ($i = 0; $i < strlen($s); $i++) {
+            $word = $s[$i];
+            if ($hasmap[$word] == 1) {
+                return $i;
+            }
+        }
+        return -1;
+    }
+}
+``` 
+
 ### **...**
 
 ```

solution/0300-0399/0387.First Unique Character in a String/README_EN.md

@@ -130,6 +130,31 @@ var firstUniqChar = function (s) {
 };
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @return Integer
+     */
+    function firstUniqChar($s) {
+        $hashmap = [];
+        for ($i = 0; $i < strlen($s); $i++) {
+            $word = $s[$i];
+            $hasmap[$word] += 1;
+        }
+        for ($i = 0; $i < strlen($s); $i++) {
+            $word = $s[$i];
+            if ($hasmap[$word] == 1) {
+                return $i;
+            }
+        }
+        return -1;
+    }
+}
+``` 
+
 ### **...**
 
 ```

solution/0300-0399/0387.First Unique Character in a String/Solution.php

@@ -0,0 +1,20 @@
+class Solution {
+    /**
+     * @param String $s
+     * @return Integer
+     */
+    function firstUniqChar($s) {
+        $hashmap = [];
+        for ($i = 0; $i < strlen($s); $i++) {
+            $word = $s[$i];
+            $hasmap[$word] += 1;
+        }
+        for ($i = 0; $i < strlen($s); $i++) {
+            $word = $s[$i];
+            if ($hasmap[$word] == 1) {
+                return $i;
+            }
+        }
+        return -1;
+    }
+}