How to use Heredoc in PHP _php tutorial

Heredoc technology, usually not detailed in regular PHP documentation and technical books, just mentions that this is a Perl-style string output technique. But now some of the forum procedures, and some of the article system, are clever use of heredoc technology, to partially realize the interface and code of the quasi-separation, phpwind template is a typical example.

As follows:
Copy CodeThe code is as follows:
$name = ' Shallow Water tour ';
Print <<


<title>Untitled Document</title>



Hello, $name!


EOT;
?>

1. In <> << < span=""><> Start tag start to EndEnd Tag End, The end tag must be written in the head, cannot have indents and spaces, and has a semicolon at the end of the tag。 The start tag is the same as the start tag, such as EOT, EOD, and EOF, which are commonly capitalized, but are not limited to those, as long as they are guaranteed opening and closing tags do not appear in the body。

2. Variables located between the opening and closing tags can be parsed normally, but the function is not . In Heredoc, a variable does not need a connector. Or, to splice, as follows:
Copy the Code code as follows:
$v = 2;
$a = <<<>
"ABC" $v
"123"
EOF;
echo $a; The result is output together with double quotes: "ABC" 2 "123"

3.heredoc is often used when the output contains a large number of HTML syntax D documents. For example: function outputhtml () to output the HTML home page. There are two ways to do this. Obviously the second is simpler and easier to read.
Copy the Code code as follows:
function outputhtml () {
echo "";
echo "Home";
echo "Homepage content";
echo ";
}

function outputhtml ()
{
Echo <<<>

Home
Home Page Content

EOT;
}
Outputhtml ();

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