Home>Article>Backend Development> Differences between PHP5 and PHP7 regarding taking array elements as dynamic function names

Differences between PHP5 and PHP7 regarding taking array elements as dynamic function names

藏色散人
藏色散人 forward
2020-02-29 13:44:19 2199browse

When executing functions/methods by obtaining function/method names through variables in PHP5 and PHP7, the same code may not run due to different interpretation strategies between versions.

Example

$a = ['add', 'sub']; class Test {   public function add()   {     echo 1 + 2;   } } $t = new Test(); $t->$a[0]();

The above example can run normally under PHP5.6, but under PHP7 it will throw Fatal error: Function name must be a string. This is because when executing $t->$a0under PHP5, $a[0] will be executed first, the element value will be obtained, and then the specific method of the object will be executed.

Under PHP7, $t->$a will be executed first, causing an error to be thrown and execution to be interrupted. If you need to execute it normally under PHP7, you need to modify it to $t->{$a[0]}().

For specific differences, please refer to:

Differences between PHP5 and PHP7 regarding taking array elements as dynamic function names

For more programming-related content, please pay attention to the php Chinese websiteIntroduction to Programmingcolumn!

The above is the detailed content of Differences between PHP5 and PHP7 regarding taking array elements as dynamic function names. For more information, please follow other related articles on the PHP Chinese website!

Statement:
This article is reproduced at:cnblogs.com. If there is any infringement, please contact admin@php.cn delete
Previous article:How does wamp try out php7? Next article:How does wamp try out php7?