PHP对象继承

PHP对象继承
<?php

class foo
{
public function printItem($string)
{
echo 'Foo: ' . $string . PHP_EOL;
}

public function printPHP()
{
echo 'PHP is great.' . PHP_EOL;
}
}

class bar extends foo
{
public function printItem($string)
{
echo 'Bar: ' . $string . PHP_EOL;
}
}

$foo = new foo();
$bar = new bar();
$foo->printItem('baz'); // Output: 'Foo: baz'
$foo->printPHP(); // Output: 'PHP is great'
$bar->printItem('baz'); // Output: 'Bar: baz'
$bar->printPHP(); // Output: 'PHP is great'

?>