关于html：在PHP中可以在变量内使用函数

In PHP is it possible to use a function inside a variable

我知道在php中您可以将变量嵌入变量中，例如：

1	<? $var1 ="I\'m including {$var2} in this variable.."; ?>

但是我想知道如何以及是否可以在变量中包含一个函数。
我知道我可以写：

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<?php
$var1 ="I\'m including";
$var1 .= somefunc();
$var1 =" in this variable..";
?>

但是如果我有一个长变量用于输出，并且我不想每次都这样做，或者我想使用多个函数怎么办：

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<?php
$var1 = <<<EOF
<html lang="en">
<head>
AAAHHHHH
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<body>
There is alot of text and html here... but I want some functions!
-somefunc() doesn't work
-{somefunc()} doesn't work
-$somefunc() and {$somefunc()} doesn't work of course because a function needs to be a string
-more non-working: ${somefunc()}
</body>
</html>
EOF;
?>

或者我想在代码负载中动态更改：

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<?
function somefunc($stuff) {
$output ="my bold text {$stuff}.";
return $output;
}

$var1 = <<<EOF
<html lang="en">
<head>
AAAHHHHH
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<body>
somefunc("is awesome!")
somefunc("is actually not so awesome..")
because somefunc("won\'t work due to my problem.")
</body>
</html>
EOF;
?>

好吗？

自PHP5以来，通过在变量中包含要调用的函数名称来支持字符串内的函数调用：

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<?
function somefunc($stuff)
{
$output ="{$stuff}";
return $output;
}
$somefunc='somefunc';
echo"foo {$somefunc("bar")} baz";
?>

将输出" foo bar baz"。

不过，我发现仅调用字符串之外的函数会更容易(这在PHP4中有效)：

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<?
echo"foo" . somefunc("bar") ." baz";
?>

或分配给一个临时变量：

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<?
$bar = somefunc("bar");
echo"foo {$bar} baz";
?>

"bla bla bla".function("blub")." and on it goes"

进一步解释Jason W所说的话：

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I find it easier however (and this works in PHP4) to either just call the
function outside of the string:

<?
echo"foo" . somefunc("bar") ." baz";
?>

您也可以直接在HTML中嵌入此函数调用，例如：

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<?

function get_date() {
$date = `date`;
return $date;
}

function page_title() {
$title ="Today's date is:". get_date() ."!";
echo"$title";
}

function page_body() {
$body ="Hello";
$body =", World!";
$body ="\
\
";
$body ="Today is:" . get_date() ."\
";
}

?>
<html>
<head>
<? page_title(); ?>
</head>
<body>
<? page_body(); ?>
</body>
</html>