也许你根本就没注意到OR的存在,那么先看个例子:
$choice1 = "ctohome.com";
$choice2 = "";
$default = "php.net";
$val_1 = $choice1 || $choice2 || $default;
$val_2 = $choice1 or $choice2 or $default;
$val_3 = ($choice1 or $choice2 or $default);
echo "val_1=$val_1 val_2=$val_2 val_3=$val_3 ";
$x_1 = foo() or bar();
$x_2 = $x_1 or bar();
$x_3 = ($x_1 or bar());
echo "x_1=$x_1 x_2=$x_2 x_3=$x_3";
function foo() {
return 0;
}
function bar() {
return 1;
}
运行结果是:
$val_1=1 $val_2=ctohome.com $val_3=1
x_1=0 x_2=0 x_3=1
你做对了吗?
另外 OR 在某种程度上还相当与 IF ,如:
is_array ($variable) OR notAnArray();
function notAnArray() {
echo "This is not an array";
}
语言解释比较麻烦,还是自己试试吧