相关疑难解决方法(0)

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This is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list.

Why is this?

It used to be hard to find questions about operators and other syntax tokens.¹
The main idea is to have links to existing questions on Stack Overflow, so it's easier for us to reference them, not to copy over content from …

什么是=&(等于-号)赋值运算符在PHP中呢？

它被弃用了吗？

请参阅Web上有关PHP Factory Pattern的示例.

在线$kind =& Vehicle::category($wheel);,我为什么要使用&？

代码:

<?php
    class Vehicle {

        function category($wheel = 0) {
            if ($wheel == 2) {
                return "Motor";
            } elseif($wheel == 4) {
                return "Car";
            }
        }
    }

    class Spec {

        var $wheel = '';

        function Spec($wheel) {
            $this->wheel = $wheel;
        }

        function name() {
            $wheel = $this->wheel;
                return Vehicle::category($wheel);
        }

        function brand() {
            $wheel = $this->wheel;
                $kind =& Vehicle::category($wheel);
            if ($kind == "Motor") {
                return array('Harley','Honda');
            } elseif($kind = "Car") …