PHP echo 与 PHP 短回显标签 [英] PHP echo vs PHP short echo tags

问题描述

它们的安全性是否相同?我被告知使用

Are they equal in safeness? I was informed that using

<?=$function_here?>

不太安全，而且会减慢页面加载时间.我严格偏向于使用 echo.

was less safe, and that it slows down page load times. I am strictly biased to using echo.

有什么优点/缺点?

推荐答案

和 被称为短开放标签，并不总是启用(请参阅 short_open_tag 指令)与 PHP5.3 或以下(但自 PHP 5.4.0 起， 始终可用).

<? and <?= are called short open tags, and are not always enabled (see the short_open_tag directive) with PHP 5.3 or below (but since PHP 5.4.0, <?= is always available).

实际上，在 PHP 5.3.0 提供的 php.ini-production 文件中，它们默认是禁用的:

Actually, in the php.ini-production file provided with PHP 5.3.0, they are disabled by default:

$ grep 'short_open' php.ini-production
; short_open_tag
short_open_tag = Off

因此，在您要分发的应用程序中使用它们可能不是一个好主意:如果未启用它们，您的应用程序将无法运行.

So, using them in an application you want to distribute might not be a good idea: your application will not work if they are not enabled.

<?php，另一方面，不能被禁用——所以，使用这个是最安全的，即使写的时间更长.

<?php, on the other side, cannot be disabled -- so, it's safest to use this one, even if it is longer to write.

除了不一定启用短的开放标签这一事实外，我认为没有太大区别.

Except the fact that short open tags are not necessarily enabled, I don't think there is much of a difference.

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