Home>Article>Backend Development> The differences and characteristics between php heredoc and nowdoc
php heredoc and nowdoc
heredoc structure
heredoc syntax Structure: <<<. After the operator, provide an identifier and then a newline. Next comes the string itself, ending with the previously defined identifier.
test FDIPZONE; echo $content; ?>
The heredoc structure cannot be used to initialize properties of a class. As of PHP 5.3, this restriction only applies when the heredoc contains variables. The following example will go wrong.
a; ?>
In the heredoc structure, variables will be replaced, but methods will not. Be careful when containing complex variables.
nowdoc structure
##nowdoc syntactic structure is very similar to the heredoc structure, but in nowdocNo parsing operationis performed. This structure is suitable for embedding PHP code or other large pieces of text without escaping special characters.
nowdoc The same tags <<< as in the heredoc structure, but the identifier followingmust be enclosed in single quotes, that is,<<<'EOF'. All the rules for heredoc structures also apply to nowdoc structures, especially the rules for terminating identifiers. nowdoc was added after php5.3.
nowdoc structure can be used in any static data environment. The most typical example is to initialize properties or constants of a class. The following example will not go wrong, you can compare it with the heredoc example.
a; ?>This article explains the differences and characteristics between php heredoc and nowdoc. For more related content, please pay attention to the php Chinese website. Related recommendations:
Explanation on php zip file content comparison
About the difference between HTML5 localStorage and sessionStorage Difference
How to get/set the language class of the user access page through php
The above is the detailed content of The differences and characteristics between php heredoc and nowdoc. For more information, please follow other related articles on the PHP Chinese website!
