如何聲明一個類的函數來扭轉信在一個句子的第一個字

Question

我已經聲明瞭一個函數來REVERS全句：

<?php 
class String { 

    private $error; 
    private $length; 
    private $string = ""; 
    private $array = array(); 
    private $index = 0; 
    private $indexOf = false; 

    private $word; 
    private $str; 


    public function __construct($string="") { 
     $this->string = $string; 

    } 

    public function revers_sentence() { 
     $this->string = strrev($this->string); 
     return $this; 
    } 

...但如何聲明一個類功能翻領信在一個句子的第一個字裏？

public function revers_1_word() { 
    hmm ? 
} 

Answer 1

public function reverse_1_word() { 
    $str_words = explode(" ", $this->string); 
    $str_words[0] = strrev($str_words[0]); 
    $this->string = implode(" ", $str_words); 
    return $this; 
} 

Answer 2

你最好聲明的方法爲這個如下：

public function reverse_first_word() { 
    // Insert your implementation here. 
} 

:-)