Default value settings for function parameters in PHP and JS

php function parameter default value setting:

<?php
function test ($val =3)
{
echo $val. " <br/> ";
}
Test (11);
Test ();
?>

JavaScript function parameter Default value setting
function test () {alert ("Test function");}

function Test2 (val,func)
{
val=val| | ""; /The value of the second parameter is returned when the first parameter value is False (null), using JS or operation. When the first argument is true (non-empty), the value of the first parameter is returned
Alert (val);
Func&&func ();//Use JS with operation, the first parameter value is true (non-null) when the second parameter func () is executed, otherwise it is not executed.
}

Test2 ()
Test2 ("hehe", test)
Test2 ("hehe")

Default value settings for function parameters in PHP and JS