PHP的变量赋值多行内容

<?php

$channel =<<<_XML_

    <channel>

    <title>What's For Dinner<title>

    <link>http://menu.example.com/<link>

    <description>Choose what to eat tonight.</description>

    </channel>

_XML_;

echo <<<END

    This uses the "here document" syntax to output

    multiple lines with variable interpolation. Note

    that the here document terminator must appear on a

    line with just a semicolon. no extra whitespace!

    <br />

END;

print $channel;

?>

结果

This uses the "here document" syntax to output

    multiple lines with variable interpolation. Note

    that the here document terminator must appear on a

    line with just a semicolon. no extra whitespace!

    <channel>

    <title>What's For Dinner<title>

    <link>http://menu.example.com/<link>

    <description>Choose what to eat tonight.</description>

注意tab也是生效了的。