aquarion@cenote:~$ vim test.php
 aquarion@cenote:~$ cat test.php
<?PHP

function f1(){
        print "F1!\n";
        return True;
}

function f2(){
        print "F2!\n";
        return True;
}

f1() & f2();

print "----------\n";

f1() && f2();


 aquarion@cenote:~$ php ./test.php
F1!
F2!
----------
F1!
F2!
 aquarion@cenote:~$ vim test.php
 aquarion@cenote:~$ cat test.php
<?PHP

function f1(){
        print "F1!\n";
        return False;
}

function f2(){
        print "F2!\n";
        return True;
}

f1() & f2();

print "----------\n";

f1() && f2();


 aquarion@cenote:~$ php ./test.php
F1!
F2!
----------
F1!