What are the potential pitfalls of referencing a variable that is not defined in PHP?

Referencing a variable that is not defined in PHP can lead to a "Notice: Undefined variable" error, which can cause unexpected behavior in your code. To avoid this issue, always make sure to initialize your variables before using them. 

// Initialize the variable before referencing it
$myVariable = '';

// Now you can safely reference $myVariable
echo $myVariable;

Keywords

Undefined variable PHP error Notice Debugging Scope

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