4.4 行末注释
注释界定符"//",可以注释掉整行或者一行中的一部分。它一般不用于连续多行的注释文本;然而,它可以用来注释掉连续多行的代码段。以下是所有三种风格的例子:
if ($foo > 1) {
// 第二种用法.
...
}
else {
return false; // 说明返回值的原因
}
//if ($bar > 1) {
//
// // 第三种用法
// ...
//}
//else {
// return false;
//}

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