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PHP PHP Basics (Retired) PHP Conditionals & Loops If / ElseIf Conditionals

Posted by Osama Awan
Osama Awan
Courses Plus Student 8,676 Points

Undefined variable

when i try to echo $role variable in html <p> tag php interpreter gives an error Notice: Undefined variable: location in /home/treehouse/workspace/index.php on line 29

Jacob Mishkin
Jacob Mishkin
23,117 Points

Can you please post the code you are having trouble with.

5 Answers

Nicholas Jacob
Nicholas Jacob
7,536 Points
Nicholas Jacob
Nicholas Jacob
7,536 Points

Has the $role variable been assigned a value? For example:

$role = "some value";

If so, make sure your syntax is correct. For example, maybe you're missing a semi-colon at the end of the statement.

Antonio Nicasio
PLUS
Antonio Nicasio
Courses Plus Student 3,601 Points
Antonio Nicasio
Antonio Nicasio
Courses Plus Student 3,601 Points

$variable = 'yourdata';

can put your code to see what's going on?

Samuel Tissot-Jobin
Samuel Tissot-Jobin
7,350 Points
Samuel Tissot-Jobin
Samuel Tissot-Jobin
7,350 Points

There is no code snippet so I can't be sure but usually a "NOTICE" like that probably means that you are accessing a variable that has not been declared yet.

//this will create the error
echo $variable;

//this won't

$variable = '';
echo $variable;

it's a question of initializing the variable to something before accessing it.

Mohamed Hak
Mohamed Hak
17,195 Points
Mohamed Hak
Mohamed Hak
17,195 Points

I think this is not your first time learning PHP, and it seems you configured PHP to handle errors. maybe that's why it show you that there is something wrong with your syntax. hope this helps.

James Pask
James Pask
13,600 Points
James Pask
James Pask
13,600 Points

I guess this is expected behaviour although it doesn't show on Hamptons videos. Presumably you get the error when you're not a student or teacher and have "Foo" in the $role variable?

I get the same but I'm assuming this is because neither of the two scenarios apply and we're not definining the $info variable.. yet. Hopefully this will be picked up as the video progresses.