Home > Backend Development > PHP Tutorial > Analysis of calling methods referenced by PHP_php skills

Analysis of calling methods referenced by PHP_php skills

WBOY
Release: 2016-05-16 19:53:42
Original
1472 people have browsed it

The example in this article describes the calling method of PHP reference. Share it with everyone for your reference, the details are as follows:

Example 1:

function test($arr){} 
echo test(&$arr); 

Copy after login

Example 2:

function test(&$arr){} 
echo test($arr); 

Copy after login

Examples 1 and 2 have the same effect.

Example 3:

function &test($arr){return $result;} 
echo &test($a);//有效 
echo test($a);//返回的是值,不是引用 

Copy after login

Summary: References are returned only when & is added before the method name when defining a method and & is added before the method name when calling a method.

Example 4:

$a=$b; 

Copy after login

When neither $a nor $b is reassigned, that is, when no writing operation occurs, it is the same as $a=&$b, which is equivalent to assigning a reference.

Only when $a or $b changes, a copy of the value will be assigned to $a

I hope this article will be helpful to everyone in PHP programming.

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template