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require_once

require

include

include_once

\n

\n

\n

require

<h1>我是头部</h1>

require 'header.php';
require 'header.php';
require 'header.php';
require 'header.php';

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require_once

require_once 'header.php';
require_once 'header.php';
require_once 'header.php';
require_once 'header.php';

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test.php

<?php
$username = 'king';
$age = 12;
echo __LINE__;
function test()
{
    echo __FILE__;
}

?>

<?php
require_once 'test.php';
echo $username;
echo "<br/>";
test();
?>

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