A quick example of interpolation in PHP (for Ben)...

interpolation-example.php

<?php

// Quick PHP interpolation example...

class Person {

	public $name = '';

	public function getName()
	{
		return $this->name;
	}
}

$name         = 'Ben';
$person       = new Person();
$person->name = $name;


// We can use the normal concatenation operator...
echo 'Do you know ' . $name . '? He has a face.' . "\r\n";
// >> Do you know Ben? He has a face.


// OR we can use double quotes and drop the variable right
// into the string. This is interpolation...
echo "Do you know $name? He has a face.\r\n";
// >> Do you know Ben? He has a face.


// If PHP has trouble discerning the variable from the string,
// we can wrap the variable in curly braces...
echo "Do you know {$name}? He has a face.\r\n";
// >> Do you know Ben? He has a face.


// We can also use object properties directly in the string...
echo "Do you know $person->name? He has a face.\r\n";
// >> Do you know Ben? He has a face.


// Notice we can't use an object method without wrapping it
// in curly braces...
echo "Do you know $person->getName()? He has a face.\r\n";
// >> Do you know ()? He has a face.
echo "Do you know {$person->getName()}? He has a face.\r\n";
// >> Do you know Ben? He has a face.