How can one handle cases where a variable is not passed through a URL in PHP?

When a variable is not passed through a URL in PHP, you can use the $_GET superglobal array to check if the variable is present in the URL. If the variable is not present, you can set a default value for it. This ensures that your code does not throw errors when trying to access a non-existent variable. 

// Check if the variable is present in the URL, otherwise set a default value
$variable = isset($_GET['variable']) ? $_GET['variable'] : 'default_value';

// Now you can use the $variable in your code
echo $variable;

Keywords

PHP variable handling URL error handling isset

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