PHP错误：未定义索引

Question

This is going to sound really stupid, but I cannot figure out why I am getting this error.

Notice: Undefined index: o in C:\\inetpub\\wwwroot\\webres\\OC_defaults.php

    $o = !empty($o) ? $o : $_REQUEST['o'];
    $ST_defaults["office"] = !empty($o) ? strtoupper($o) : $officeDefault;
    extract($ST_defaults);

Thanks, Jatin

Answer 1

$_REQUEST['o'] is not set. .. a simple fix would be to add

if(!array_key_exists('o',$_REQUEST)){$_REQUEST['o']='';};

oh, also, don't use $_REQUEST, its bad practice, its lazy, where the data comes is unknown, corruption/overwriting is possible~

use $_COOKIE / $_POST / $_GET instead..

Answer 2

o is not defined in the associative array $_REQUEST .

You can check if it is defined by using isset($_REQUEST['o']) .