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Detailed explanation of heredoc method (EOF) in php

WBOYOriginal: 2016-07-25 08:58:22968browse

This article introduces the usage of heredoc in PHP, which can output long paragraphs of document content. Some friends may refer to it.

Heredoc technology, in most programming examples, generally only a Perl-style string output technology is introduced. Nowadays, many PHP programs cleverly use heredoc technology to partially realize the quasi-separation of interface and code. Among them, phpwind template is a typical application example.

For example:

<?php 
$name = '脚本 学堂';
print <<<EOT
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>bbs.it-home.org</title> 
</head> 
<body> 
<!--12321--> 
Hello,$name! 
</body> 
</html>
EOT;
?>

Instructions: 1. Start with the

<?php
$v=2;
$a= <<<EOF
"abc"$v
"123"
EOF;
echo $a; //结果连同双引号一起输出："abc"2 "123"
?>

3. Heredoc is commonly used when outputting documents containing a large number of HTML syntax. For example: the function outputhtml() should output the HTML homepage.

can be written in two ways. Obviously the second way of writing is simpler and easier to read.

<?php
function outputhtml(){
echo "<html>";
echo "<head><title>脚本 学堂 主页</title></head>"; 
echo "<body>主页内容</body>";
echo "</html>;
}
function outputhtml()
{
echo <<<EOT
   <html>
   <head><title>脚本 学堂 主页</title></head>
   <body>主页内容</body>
   </html>
EOT;
}
outputhtml();
?>

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