也許你根本就沒注意到OR的存在,那麼先看個例子:$choice1 = "wdphp.com";
$choice2 = "";
$default = "vducn.com";$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=$x_3";function foo() {
return 0;
}function bar() {
return 1;
}運行結果是:$val_1=1 $val_2=wdphp.com $val_3=1
x_1=0 x_2=0 x_3=1你做對了嗎?
另外 OR 在某種程度上還相當與 IF ,如:is_array ($variable) OR notAnArray();function notAnArray() {
echo "This is not an array";
}語言解釋比較麻煩,還是自己試試吧