What is the usage of php delimiter?

The usage of delimiter in php is [<<

The operating environment of this article: windows10 system, php 7.3, thinkpad t480 computer.

PHP is a Web programming language. During the programming process, you will inevitably encounter the situation of using echo to output large sections of HTML code or Javascript scripts. If you use traditional string output, you must use a large number of escape characters to escape special characters in the string, such as single quotes '', double quotes "", etc., and grammatical errors will inevitably occur.

The delimiter in PHP can define a longer string, and the things inside it can be output as is, including newlines, indentation and other formats, and any special characters in the delimiter No escaping is required, and variables in delimiters can also be parsed. This is one of the reasons why we use delimiters.

The syntax format of the delimiter is as follows:

<<<str
    一段文本
str;

Note: The symbol <<< is a keyword and must be used; str is our custom identifier, use used as the starting identifier and ending identifier of the text, the identifier names before and after must be exactly the same.

In addition, the semicolon after the end identifier cannot be omitted, and the end identifier must be written at the beginning of a new line. Also, the naming of identifiers must follow the naming rules of other tags in PHP: they can only contain letters, numbers, and underscores, and they must start with an underscore or non-numeric character.

Although variables can be parsed in strings defined using delimiters, operations cannot be performed.

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