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MySQLi Configuration Options

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MySQLi Configuration OptionsNameDefaultChangeableChangelogmysqli.allow_local_infile"0"INI_SYSTEMBefore PHP 7.2.16 and 7.3.3 the default was "1".mysqli.local_infile_directoryINI_SYSTEMAvailable as of PHP 8.1.0.mysqli.allow_persistent"1"INI_SYSTEMmysqli.max_persistent"-1"INI_SYSTEMmysqli.max_links"-1"INI_SYSTEMmysqli.default_port"3306"INI_ALLmysqli.default_socketNULLINI_ALLmysqli.default_hostNULLINI_ALLmysqli.default_userNULLINI_ALLmysqli.default_pwNULLINI_ALLmysqli.reconnect"0"INI_SYSTEMRemoved as of PHP 8.2.0mysqli.rollback_on_cached_plink"0"INI_SYSTEM

Runtime Runtime

Name	Default	Changeable	Changelog
mysqli.allow_local_infile	"0"	`INI_SYSTEM`	Before PHP 7.2.16 and 7.3.3 the default was "1".
mysqli.local_infile_directory		`INI_SYSTEM`	Available as of PHP 8.1.0.
mysqli.allow_persistent	"1"	`INI_SYSTEM`
mysqli.max_persistent	"-1"	`INI_SYSTEM`
mysqli.max_links	"-1"	`INI_SYSTEM`
mysqli.default_port	"3306"	`INI_ALL`
mysqli.default_socket	NULL	`INI_ALL`
mysqli.default_host	NULL	`INI_ALL`
mysqli.default_user	NULL	`INI_ALL`
mysqli.default_pw	NULL	`INI_ALL`
mysqli.reconnect	"0"	`INI_SYSTEM`	Removed as of PHP 8.2.0
mysqli.rollback_on_cached_plink	"0"	`INI_SYSTEM`

For further details and definitions of the preceding INI_* constants, see the chapter on configuration changes.

Title

mysqli.allow_local_infilebool: Allow accessing, from PHP's perspective, local files with LOAD DATA statements
mysqli.local_infile_directorystring: Allows restricting LOCAL DATA loading to files located in this designated directory.
mysqli.allow_persistentbool: Enable the ability to create persistent connections using mysqli_connect().
mysqli.max_persistentint: The maximum number of persistent connections that can be made. Set to 0 for unlimited.
mysqli.max_linksint: The maximum number of connections per process.
mysqli.default_portint: The default TCP port number to use when connecting to the database server if no other port is specified. If no default is specified, the port will be obtained from the MYSQL_TCP_PORT environment variable, the mysql-tcp entry in /etc/services or the compile-time MYSQL_PORT constant, in that order. Win32 will only use the MYSQL_PORT constant.
mysqli.default_socketstring: The default socket name to use when connecting to a local database server if no other socket name is specified.
mysqli.default_hoststring: The default server host to use when connecting to the database server if no other host is specified.
mysqli.default_userstring: The default user name to use when connecting to the database server if no other name is specified.
mysqli.default_pwstring: The default password to use when connecting to the database server if no other password is specified.
mysqli.reconnectint: Automatically reconnect if the connection was lost.
Note
This Ini setting had been ignored by the mysqlnd driver, and was removed as of PHP 8.2.0.
mysqli.rollback_on_cached_plinkbool: If this option is enabled, closing a persistent connection will rollback any pending transactions of this connection before it is put back into the persistent connection pool. Otherwise, pending transactions will be rolled back only when the connection is reused, or when it is actually closed.

Users cannot set MYSQL_OPT_READ_TIMEOUT through an API call or runtime configuration setting. Note that if it were possible there would be differences between how libmysqlclient and streams would interpret the value of MYSQL_OPT_READ_TIMEOUT.

Source: reference/mysqli/ini.xml · from the official PHP manual (php/doc-en)