How can PHP developers ensure that variables like $envoi are properly initialized and utilized in their scripts?

PHP developers can ensure that variables like $envoi are properly initialized and utilized by declaring and assigning a value to the variable before using it in their scripts. This helps prevent errors related to uninitialized variables and ensures that the variable contains the expected data when it is used. Additionally, developers can use conditional statements to check if the variable is set before using it to avoid potential issues.

$envoi = ''; // Initialize the variable with an empty string

// Check if $envoi is set before using it
if(isset($envoi)) {
    // Use $envoi in your script
    echo $envoi;
} else {
    echo "Variable \$envoi is not set.";
}