Correctly identify whether the server supports utf8mb4_520
#143
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In older versions of PHP `$db_version` will be `5.5.5` for MariaDB, which prevents the use of the `utf8mb4_unicode_520_ci` collation. See https://core.trac.wordpress.org/changeset/54384
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In older versions of PHP
$db_versionwill be5.5.5for MariaDB, which prevents the use of theutf8mb4_unicode_520_cicollation.See https://core.trac.wordpress.org/changeset/54384
This merges WordPress/wordpress-develop@fed98bd & WordPress/wordpress-develop@11df927 to HyperDB.