In PHP, How to call a function interpolated in string?

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If you’re calling a method of some class, you can use normal variable expansion. For example:

<?php
class thingie {

  public function sayHello() {
    return "hello";
  }

}

$t = new thingie();
echo "thingie says: {$t->sayHello()}";

This will output:

thingie says: hello

Note that the braces around the call are required.

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