<?php
defer($context, $callback);

<?php
function helloGoodbye()
{
    defer($_, function () {
        echo "goodbye\n";
    });
    defer($_, function () {
        echo "...\n";
    });
    echo "hello\n";
}
echo "before hello\n";
helloGoodbye();
echo "after goodbye\n";
// Output:
//
// before hello
// hello
// ...
// goodbye
// after goodbye

<?php
function throwException()
{
    defer($_, function () {
        echo "after exception\n";
    });
    echo "before exception\n";
    throw new \Exception('My exception');
}
try {
    throwException();
} catch (\Exception $e) {
    echo "exception has been caught\n";
}
// Output:
//
// before exception
// after exception
// exception has been caught