转换阵列串（分3个字）

Question

我们有动态的帖子，我们应该在URL

$this->post_message = "THIS IS SAMPLE STRING FOR TEST"; 
if (strlen($this->post_message) > 5) { 
     $key='<> ";,/\][{}|`~!#$%^&*_+=-'; 
     $bodypost1 =trim($this->post_message,$key); 
     $bodypost2 = explode (' ',$bodypost1,3); 
     $bodypost = array_shift(',',$bodypost2); 
     }else{ 

     $bodypost2 = explode (' ',$this->post_message,3); 
     $bodypost = array_shift(',',$bodypost2); 
     } 

分割字符串的3个字的使用，这是URL参数

$this->permalink  = $C->SITE_URL.'view/'.($type=='private'?'priv':'post').':'.$this->post_id.'/'.$bodypost.'.html'; 

和我的网址回：

sitename.com/123/THIS.html
而应该是
sitename.com/123/THIS IS SAMPLE.ht毫升

Answer 1

试试这个

$message = "THIS IS SAMPLE STRING FOR TEST"; 

$string = implode(' ', array_slice(explode(' ', $message), 0, 3)); 

var_dump($string); 

//result ... 

string(14) "THIS IS SAMPLE" 

Answer 2

也许有些正则表达式向导可以做得比这更好，但：

$this->post_message = "THIS IS SAMPLE STRING FOR TEST"; 
$result = preg_match("/^([^ ]+(?: [^ ]+)?(?: [^ ]+)?)/", $this->post_message, $matches); 
if ($result) { 
    $bodypost = $matches[1]; 
}