What is the significance of the "Undefined variable" notice in PHP scripts?

The "Undefined variable" notice in PHP scripts indicates that a variable is being used without being previously defined. To solve this issue, you can define the variable before using it or check if it is set using isset() function to avoid the notice. 

// Define the variable before using it
$variable = '';

// Check if the variable is set before using it
if(isset($variable)) {
    // Your code here
}

Keywords

Undefined variable PHP scripts significance notice error types

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