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<?php
/**
* Does the database server claim to have support for UTF-8 Multibyte (utf8mb4) collation?
*
* libmysql supports utf8mb4 since 5.5.3 (same version as the MySQL server). mysqlnd supports utf8mb4 since 5.0.9.
*
* @return boolean
*
* @since CMS 3.5.0
*/
function serverClaimsUtf8mb4Support()
{
if(!is_large_prefix_enabled()){
return false;
}
$client_version = mysqli_get_client_info();
if (strpos($client_version, 'mysqlnd') !== false)
{
$client_version = preg_replace('/^\D+([\d.]+).*/', '$1', $client_version);
return version_compare($client_version, '5.0.9', '>=');
}
else
{
return version_compare($client_version, '5.5.3', '>=');
}
}
function get_dbtype() {
$con = mysqli_connect("[[softdbhost]]","[[softdbuser]]","[[softdbpass]]","[[softdb]]");
$details = mysqli_get_server_info($con);
if(preg_match('/mariadb/is', $details)){
return 'mariadb';
}
return 'mysqli';
}
function get_engine_type(){
return 'innodb';
}
/**
* Get the version of the database connector.
*
* @return string The database connector version.
*
* @since 12.1
*/
function getVersion(){
global $con;
$con = mysqli_connect("[[softdbhost]]","[[softdbuser]]","[[softdbpass]]","[[softdb]]");
$ver = mysqli_get_server_info($con);
if(preg_match('/mariadb/is', $ver)){
preg_match('/-(.*?)-mariadb/is', $ver, $matches);
if(empty($matches[1])){
preg_match('/(.*?)-mariadb/is', $ver, $matches);
}
if(!empty($matches[1])){
$ver = $matches[1];
}
}
return $ver;
}
function get_row_format($table = null) {
global $con;
$rowformat = null;
if (is_antelope_file_format_no_more_supported()) {
$rowformat = 'Barracuda';
return $rowformat;
}
$sql = "SHOW VARIABLES LIKE 'innodb_file_format'";
$result = mysqli_query($con, $sql);
if ($rec = $result->fetch_assoc()) {
// MySQL 8 BC: information_schema.* returns the fields in upper case.
$rec = array_change_key_case($rec, CASE_LOWER);
if (isset($table)) {
$rowformat = $rec['row_format'];
} else {
$rowformat = $rec['value'];
}
}
return $rowformat;
}
function is_antelope_file_format_no_more_supported() {
// Breaking change: Antelope file format support has been removed from both MySQL and MariaDB.
// The following InnoDB file format configuration parameters were deprecated and then removed:
// - innodb_file_format
// - innodb_file_format_check
// - innodb_file_format_max
// - innodb_large_prefix
// 1. MySQL: deprecated in 5.7.7 and removed 8.0.0+.
$ismysqlge8d0d0 = (get_dbtype() == 'mysqli') &&
version_compare(getVersion(), '8.0.0', '>=');
// 2. MariaDB: deprecated in 10.2.0 and removed 10.3.1+.
$ismariadbge10d3d1 = (get_dbtype() == 'mariadb') &&
version_compare(getVersion(), '10.3.1', '>=');
return $ismysqlge8d0d0 || $ismariadbge10d3d1;
}
function is_compressed_row_format_supported($cached = true) {
$engine = get_engine_type();
$info = getVersion();
if (version_compare($info, '5.5.0') < 0) {
// MySQL 5.1 is not supported here because we cannot read the file format.
$compressedrowformatsupported = false;
} else if ($engine !== 'innodb' and $engine !== 'xtradb') {
// Other engines are not supported, most probably not compatible.
$compressedrowformatsupported = false;
} else if (!is_file_per_table_enabled()) {
$compressedrowformatsupported = false;
} else if (get_row_format() !== 'Barracuda') {
$compressedrowformatsupported = false;
} else {
// All the tests passed, we can safely use ROW_FORMAT=Compressed in sql statements.
$compressedrowformatsupported = true;
}
return $compressedrowformatsupported;
}
function is_file_per_table_enabled() {
global $con;
$sql = "SHOW VARIABLES LIKE 'innodb_file_per_table'";
$result = mysqli_query($con, $sql);
if ($rec = $result->fetch_assoc()) {
// MySQL 8 BC: information_schema.* returns the fields in upper case.
$rec = array_change_key_case($rec, CASE_LOWER);
if ($rec['value'] == 'ON') {
return true;
}
}
return false;
}
function get_row_format_sql($engine = null, $collation = null) {
$rowformat = '';
$serverClaimsUtf8mb4Support = serverClaimsUtf8mb4Support();
$engine = get_engine_type();
if (($engine === 'innodb' || $engine === 'xtradb') && !empty($serverClaimsUtf8mb4Support)) {
if (is_compressed_row_format_supported()) {
$rowformat = "ROW_FORMAT=COMPRESSED";
} else {
$rowformat = "ROW_FORMAT=DYNAMIC";
}
}
return $rowformat;
}
function is_large_prefix_enabled() {
global $con;
if (is_antelope_file_format_no_more_supported()) {
// Breaking change: Antelope file format support has been removed, only Barracuda.
return true;
}
$sql = "SHOW VARIABLES LIKE 'innodb_large_prefix'";
$result = mysqli_query($con, $sql);
if ($rec = $result->fetch_assoc()) {
// MySQL 8 BC: information_schema.* returns the fields in upper case.
$rec = array_change_key_case($rec, CASE_LOWER);
if ($rec['value'] == 'ON') {
return true;
}
}
return false;
}
function detect_collation(){
// Create connection
$con = mysqli_connect("[[softdbhost]]","[[softdbuser]]","[[softdbpass]]","[[softdb]]");
// We want only utf8 compatible collations.
$collation = null;
$query = "SHOW COLLATION WHERE Collation LIKE 'utf8mb4\_%' AND Charset = 'utf8mb4'";
$result = mysqli_query($con, $query);
while ($row = mysqli_fetch_assoc($result)) {
$collation = $row['Collation'];
if (strtoupper($row['Default']) === 'YES') {
$collation = $row['Collation'];
break;
}
}
if (!$collation) {
$result = mysqli_fetch_array(mysqli_query($con, "SELECT @@collation_database;"));
$value = $result['@@collation_database'];
if (strpos($value, 'utf8_') === 0 || strpos($value, 'utf8mb4_') === 0) {
$collation = $value;
}
}
return $collation;
}
$serverClaimsUtf8mb4Support = serverClaimsUtf8mb4Support();
$row_format = get_row_format_sql();
$collation = detect_collation();
if(!empty($serverClaimsUtf8mb4Support) && !empty($row_format)){
echo $utf8 = '<claim_utf8>utf8mb4</claim_utf8>';
echo '</br>';
echo '<row_format>'.$row_format.'</row_format>';
}
if(!empty($utf8) && $utf8 == '<claim_utf8>utf8mb4</claim_utf8>'){
echo '</br>';
echo '<collation>'.$collation.'</collation>';
}
?>