Qiita Teams that are logged in
You are not logged in to any team

Log in to Qiita Team
Community
OrganizationEventAdvent CalendarQiitadon (β)
Service
Qiita JobsQiita ZineQiita Blog
23
Help us understand the problem. What is going on with this article?

More than 5 years have passed since last update.

@KaI_Qiita

Notice: Undefined variable:

Notice: Undefined variable:エラー

案外遭遇するのでメモ。

どういうときに出てくるエラーなのかというと↓

IndexController.php
$value = 5;

if($value == 12){
  $ans = "valueは、12です。";
}

$this -> view -> answer = $ans;

このとき $value は if の中を通らないので、

$this -> view -> answer = $ans;

のところでエラーが出る。
「$ansって何やねん」ってことで、「Notice: Undefined variable:」なのね。

こう直してあげれば怒られないはず↓

IndexController.php
$value = 5;
$ans = null;  //初期化してあげるとか。

if($value == 12){
  $ans = "valueは、12です。";
}else{
 $ans = "valueは12ではないです。";  //絶対値が入るようにしてあげるとか。
}

$this -> view -> answer = $ans;
23
Help us understand the problem. What is going on with this article?
Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
23
Help us understand the problem. What is going on with this article?