What is the purpose of using isset() in PHP?

When working with PHP, it is important to check if a variable is set before using it to avoid potential errors or warnings. The `isset()` function in PHP is used to determine if a variable is set and is not NULL. This helps prevent undefined variable errors and ensures that the code runs smoothly without unexpected behavior. 

// Check if the variable $name is set before using it
if(isset($name)) {
    echo "The variable name is set.";
} else {
    echo "The variable name is not set.";
}

Keywords

isset PHP variable null conditional

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