PHP里OR的用法舉例

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    也許你根本就沒注意到OR的存在,那么先看個例子:$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=$x_3";function foo() {
    return 0;
    }function bar() {
    return 1;
    }運行結(jié)果是:$val_1=1 $val_2=wdphp.com $val_3=1
    x_1=0 x_2=0 x_3=1你做對了嗎?
    另外 OR 在某種程度上還相當(dāng)與 IF ,如:is_array ($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