There are several ways to assign values ​​to variables in php

How many ways are there to assign values ​​to variables in php?

3 ways to assign values ​​​​to variables in php

1. Value assignment, such as $a=1,$b=$a, etc.;

2. Reference assignment, for example $a=&$b, that is, $a and $b both point to the same storage variable value address in memory;

3. Reference counting value transfer, The default value-passing method for objects in php and js is reference counting. The example is as follows:

<?php
class Dog{
    public $name="小花"；
    public $leg=4;
}
$a=new Dog;//此时，$a指向了内存中的一个地址（假设0XFFAD[1]）,该地址又指向最终对象的值
$b=$a;//此时，$b和$a都指向了内存中的另一个地址（0XFFAD[2]），该地址又指向最终对象的值
var_dump($b->leg);//结果是int 4
$b=999;
var_dump($b);//结果是int 999;
var_dump($a);//此时的结果不是int 999，而是object(Dog)[1]
                                                                    
public &#39;name&#39; => string &#39;灏忚姳&#39; (length=6)  public &#39;leg&#39; => int 4

It can be seen that the object's value-passing method is somewhat different from the second reference-counting method. difference.

Recommended: "PHP Tutorial"

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