Notes on the use of php references

illustrate

1. References in PHP are not pointers. Two variables are allowed to point to the same content.

2. If a variable with a reference is assigned a value in the foreach statement, the referenced object is also changed.

Example

 <?php

function test(&$b)
{
$c = 2;
$b = & $c;

// Guess whether the output here is 1 or 2?
var_dump($a);
}

$a = 1;

test($a);

// Guess whether the output here is 1 or 2?
var_dump($a);

The above are the notes on the use of php references. I hope it will be helpful to everyone.