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Unit 7: Functions
{ Notes
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’
?>
7.10 Summary
• The general way of defining a function is
Function function_name (arg1, arg2, arg3,………).
• Every function has its own set of variables. Any variable used outside the function’s
definition are not accessible from within the function by default.
• The return statement returns value by value, which means that a copy of the value is
created and is returned to the caller of the function.
• Default parameters enable you to specify a default value for function parameters that are
not passed to the function during the function call.
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