Php 7.1 - 空索引运算符数组

Question

如 http://php.net/manual/en/language.types.array.php 所述

Note: As of PHP 7.1.0, applying the empty index operator on a string throws a fatal error. Formerly, the string was silently converted to an array.

谁能举例说明这是什么意思？

它将如何影响我的代码？

谢谢!

Answer 1

在 PHP < 7.1 中:

$var = 'somestring';
$var[] = 'a'; # yields array with two elements ['somestring', 'a']

在 PHP >= 7.1 中这会产生

Fatal error: Uncaught Error: [] operator not supported for strings