What is the significance of checking if a variable is set before executing a switch statement in PHP?

Checking if a variable is set before executing a switch statement in PHP is important to avoid potential errors or warnings when the variable is undefined. If the variable is not set and the switch statement is executed, PHP will throw a notice or warning. By checking if the variable is set before the switch statement, we can ensure that the code will run without any issues. 

if(isset($variable)) {
    switch($variable) {
        case 'value1':
            // Code block for value1
            break;
        case 'value2':
            // Code block for value2
            break;
        default:
            // Default code block
    }
} else {
    // Handle case when variable is not set
}

Keywords

PHP variable set switch statement error handling

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