Summary of php heredoc application

Heredoc of php uses the summary Heredoc technology, which is not detailed in the formal PHP documents and technical books. it only mentions that it is a Perl-style string output technology. However, some forum programs and some article systems use heredoc to partially implement quasi-separation of interfaces and codes, for example: & lt ;? Php $ name = 'Summary of heredoc usage for Shanyu php
Heredoc technology is generally not detailed in regular PHP documents and technical books. it only mentions that it is a Perl-style string output technology. However, some forum programs and some article systems use heredoc to partially implement quasi-separation of interfaces and codes.

For example:

   
  Untitled Document   
 Hello, $ name! EOT;?>

I. With < The ending mark must be at the top of the mark, and there must be no indentation or space and a semicolon at the end of the ending mark. The start tag is the same as the start tag,For example, EOT, EOD, and EOF are commonly used in uppercase, but they are not limited to only a few. you only need to ensure that the start mark and end Mark do not appear in the body.


II. Located between the start mark and end mark Variables can be parsed normally., The function is not allowed.. In heredoc, variables do not need to be concatenated with connectors. or.

For example:

$ V = 2; $ a = <
  
   

   

   3.. Heredoc is often used to output a large number of HTML syntax d documents. For example, the outputhtml () function outputs the HTML homepage. There can be two writing methods. Obviously, the second method is relatively simple and easy to read.
   

   

   
Function outputhtml () {echo""; Echo"Home Page"; Echo"Homepage content"; Echo";} Function outputhtml () {echo <
       
     Home Page   Homepage content   EOT;} outputhtml ();