feat: add php solution to lc problem: No.0058 (doocs#907)

No.0058.Length of Last Word

Author: Qiu-IT

solution/0000-0099/0058.Length of Last Word/README.md

@@ -176,6 +176,28 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @return Integer
+     */
+    function lengthOfLastWord($s) {
+        $count = 0;
+        while ($s[strlen($s) - 1] == " ") {
+            $s = substr($s, 0, -1);
+        }
+        while (strlen($s) != 0 && $s[strlen($s) - 1] != " ") {
+            $count++;
+            $s = substr($s, 0, -1);
+        }
+        return $count;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0000-0099/0058.Length of Last Word/README_EN.md

@@ -160,6 +160,28 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @return Integer
+     */
+    function lengthOfLastWord($s) {
+        $count = 0;
+        while ($s[strlen($s) - 1] == " ") {
+            $s = substr($s, 0, -1);
+        }
+        while (strlen($s) != 0 && $s[strlen($s) - 1] != " ") {
+            $count++;
+            $s = substr($s, 0, -1);
+        }
+        return $count;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0000-0099/0058.Length of Last Word/Solution.php

@@ -0,0 +1,17 @@
+class Solution {
+    /**
+     * @param String $s
+     * @return Integer
+     */
+    function lengthOfLastWord($s) {
+        $count = 0;
+        while ($s[strlen($s) - 1] == " ") {
+            $s = substr($s, 0, -1);
+        }
+        while (strlen($s) != 0 && $s[strlen($s) - 1] != " ") {
+            $count++;
+            $s = substr($s, 0, -1);
+        }
+        return $count;
+    }
+}