在PHP中是否可以在变量中使用函数

StackOverflow https://stackoverflow.com/questions/60409

  •  09-06-2019
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题

我知道在 php 中你可以在变量中嵌入变量，例如：

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

但我想知道如何以及是否可以在变量中包含函数。我知道我可以写：

<?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：

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

或者我想要动态更改该代码负载：

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

$var1 = <<<EOF
    <html lang="en">
        <head>
            <title>AAAHHHHH</title>
            <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;
?>

出色地？

有帮助吗？

解决方案

自 PHP5 起，通过使用包含要调用的函数名称的变量来支持字符串内的函数调用：

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

将输出“foo <b>bar</b> baz".

然而，我发现在字符串之外调用函数更容易（这在 PHP4 中有效）：

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

或分配给临时变量：

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

其他提示

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

扩展一下 Jason W 所说的内容：

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";
?>

您也可以直接将此函数调用嵌入到 html 中，例如：

<?

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 = "\n
\n";
    $body = "Today is: " . get_date() . "\n";
}

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