... Constructors are functions in a class that are automatically called when you create a new instance of a class with new . In PHP 3, a function becomes a constructor when it has the same name as the class. ... The following examples should be read carefully to understand these limitations. class A { function A() { echo "I am the constructor of A.<br>\n"; } } class B extends A { function C() { echo "I am a regular function.<br>\n"; } } // no constructor is being called in PHP 3. $b = new B; . ...