[php-src] Issue #21648: Export arrays as [] instead of array() in var_export

[email protected] (AJK-Muc)
Newsgroups php.bugs
Message-ID <[email protected]>
Issue: https://github.com/php/php-src/issues/21648
Author: AJK-Muc

### Description

PHP can use `$a = []` instead of `$a = array()` for very long, `var_export()` does not unfortunately. Please make it possible. Thanks.
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