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也许你根本就没注意到OR的存在,那么先看个例子:$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=$x_3";function foo() { return 0; }function bar() { return 1; }运行结果是:$val_1=1 $val_2=wdphp.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 |