What are the ways to write php tags?

There are four ways to write the

php tag, namely: 1. []; 2. []; 3. [<% echo=""> ]; 4. [ 】.

The operating environment of this article: windows10 system, php 5.4&&php 7, thinkpad t480 computer.

I believe everyone knows that the beginning of php program is

• Normal writing method

• Short tag writing method, 5.4 Start

• ##<% echo 1; %> asp style writing

• Long tag writing method

The differences between different versions are as follows:
The first way is normal writing, there is nothing to say.
The second type requires the directive short_open_tag in the php.ini configuration file to be turned on before it is available, or the --enable-short-tags option is added when compiling PHP. As of PHP 5.4, the short form echo tag
The third method is not recommended. It is a syntactic sugar writing method added for asp programmers to learn php. It needs to be opened through the directive asp_tags in the php.ini configuration file before it can be used.
The fourth type is no longer parsed after php7.0.
Recommended learning:

php training

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