How can PHP developers handle empty variables to prevent unnecessary output in their scripts?

To prevent unnecessary output in PHP scripts when dealing with empty variables, developers can use conditional statements to check if a variable is empty before attempting to output its value. This can be done using functions like `isset()` or `empty()` to ensure that only non-empty variables are displayed. 

<?php
$var = ""; // empty variable

if (!empty($var)) {
    echo $var; // output variable if not empty
}
?>

Keywords

PHP empty variables handling prevent unnecessary output

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