How can the isset() function be used to check if a variable is set in PHP?

When working with variables in PHP, it's important to check if a variable is set before using it to avoid potential errors. The isset() function in PHP can be used to determine if a variable is set and is not NULL. This function returns true if the variable exists and has a value, and false otherwise. By using isset() before accessing a variable, you can ensure that your code runs smoothly without encountering undefined variable errors. 

// Check if a variable is set using isset()
$variable = "Hello, World!";
if(isset($variable)) {
    echo "The variable is set and has a value.";
} else {
    echo "The variable is not set or is NULL.";
}

Keywords

PHP isset() variable check set

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