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February 1, 2023 12:55
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<?php | |
public function determine_charset( $charset, $collate ) { | |
if ( ( $this->use_mysqli && ! ( $this->dbh instanceof mysqli ) ) || empty( $this->dbh ) ) { | |
return compact( 'charset', 'collate' ); | |
} | |
if ( 'utf8' === $charset && $this->has_cap( 'utf8mb4' ) ) { | |
$charset = 'utf8mb4'; | |
} | |
if ( 'utf8mb4' === $charset && ! $this->has_cap( 'utf8mb4' ) ) { | |
$charset = 'utf8'; | |
$collate = str_replace( 'utf8mb4_', 'utf8_', $collate ); | |
} | |
if ( 'utf8mb4' === $charset ) { | |
// _general_ is outdated, so we can upgrade it to _unicode_, instead. | |
if ( ! $collate || 'utf8_general_ci' === $collate ) { | |
$collate = 'utf8mb4_unicode_ci'; | |
} else { | |
$collate = str_replace( 'utf8_', 'utf8mb4_', $collate ); | |
} | |
} | |
// _unicode_520_ is a better collation, we should use that when it's available. | |
if ( $this->has_cap( 'utf8mb4_520' ) && 'utf8mb4_unicode_ci' === $collate ) { | |
$collate = 'utf8mb4_unicode_520_ci'; | |
} | |
return compact( 'charset', 'collate' ); | |
} |
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