【Php】数组遍历，foreach, each, trim()

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<?php     $iplist = "122.224.251.154|192.168.2.138|192.168.2.12";     echo $_SERVER['REMOTE_ADDR'] . "<br/>";     $arr = explode('|', $iplist);   // 将iplist用'|'分割       echo "<br/>";     print_r($arr);     echo "<br/>";     foreach($arr as $key => $ip) // 遍历数组1     {         echo "$key = $ip<br/>";     }       echo "<br/>";     reset($arr);                    // 重置arr数组指针     print_r($arr);     echo "<br/>";     while (list($key, $val) = each($arr))   // 遍历数组2     {         echo "$key = $val<br/>";     }       echo "<br/>";     $str = "    hello world  \n       ";     $str = trim($str);              // trim()     echo "#$str#<br/>";       echo "<br/>";     $arr = array(1, 2, array('hello', 'world', 33), 66, 'come on');     print_r($arr);                  // 打印嵌套数组     echo "<br/>";           echo "<br/>";     $arr = array(         'name' => 1,         'nick' => 2,         'arr' => array('hello', 'world', 33),         66,         'come on'         );                          // 这种方式的数组相当于json/dict格式了     print_r($arr);     echo "<br/>"; ?>