How to implement virtual method in php

Php virtual method implementation: First create a PHP sample file; then pass "d713d4031b425214c45e53425e7a3f69x(), then if A::y() in the subclass ::x() is overridden by B::x(), A::y() will call B::x().

The running results of the above example are as follows:

A::x() was called. A::y() was called. --
B::x() was called. A::z() was called.
virtual-function.php

The code is as follows:

<?php 
class ParentClass { 
static public function say( $str ) { 
static::do_print( $str ); 
} 
static public function do_print( $str ) { 
echo "<p>Parent says $str</p>"; 
} 
} 
class ChildClass extends ParentClass { 
static public function do_print( $str ) { 
echo "<p>Child says $str</p>"; 
} 
} 
class AnotherChildClass extends ParentClass { 
static public function do_print( $str ) { 
echo "<p>AnotherChild says $str</p>"; 
} 
} 
echo phpversion(); 
$a=new ChildClass(); 
$a->say( &#39;Hello&#39; ); 
$b=new AnotherChildClass(); 
$b->say( &#39;Hello&#39; );

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