How can undefined variable errors be avoided in PHP code?

Undefined variable errors in PHP code can be avoided by checking if a variable is set before using it. This can be done using the isset() function or by initializing variables with default values. By ensuring that variables are defined before being used, you can prevent these errors from occurring. 

// Avoid undefined variable error by checking if the variable is set before using it
$variable = isset($variable) ? $variable : '';

// Example usage
if(isset($variable)){
    echo $variable;
}

Keywords

PHP error handling isset isset() variable scope

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