The mysqli Extension and Persistent Connections
The MySQLi Extension Function Summary
Mysqli
PHP Manual

# Predefined Constants

`MYSQLI_READ_DEFAULT_GROUP`

  Read options from the named group from my.cnf or the file specified with `MYSQLI_READ_DEFAULT_FILE`

`MYSQLI_READ_DEFAULT_FILE`

  Read options from the named option file instead of from my.cnf

`MYSQLI_OPT_CONNECT_TIMEOUT`

  Connect timeout in seconds

`MYSQLI_OPT_LOCAL_INFILE`

  Enables command LOAD LOCAL INFILE

`MYSQLI_INIT_COMMAND`

  Command to execute when connecting to MySQL server. Will automatically be re-executed when reconnecting.

`MYSQLI_CLIENT_SSL`

  Use SSL (encrypted protocol). This option should not be set by application programs; it is set internally in the MySQL client library

`MYSQLI_CLIENT_COMPRESS`

  Use compression protocol

`MYSQLI_CLIENT_INTERACTIVE`

  Allow interactive_timeout seconds (instead of wait_timeout seconds) of inactivity before closing the connection. The client's session wait_timeout variable will be set to the value of the session interactive_timeout variable.

`MYSQLI_CLIENT_IGNORE_SPACE`

  Allow spaces after function names. Makes all functions names reserved words.

`MYSQLI_CLIENT_NO_SCHEMA`

  Don't allow the db_name.tbl_name.col_name syntax.

`MYSQLI_CLIENT_MULTI_QUERIES`

  Allows multiple semicolon-delimited queries in a single mysqli_query() call.

`MYSQLI_STORE_RESULT`

  For using buffered resultsets

`MYSQLI_USE_RESULT`

  For using unbuffered resultsets

`MYSQLI_ASSOC`

  Columns are returned into the array having the fieldname as the array index.

`MYSQLI_NUM`

  Columns are returned into the array having an enumerated index.

`MYSQLI_BOTH`

  Columns are returned into the array having both a numerical index and the fieldname as the associative index.

`MYSQLI_NOT_NULL_FLAG`

  Indicates that a field is defined as NOT NULL

`MYSQLI_PRI_KEY_FLAG`

  Field is part of a primary index

`MYSQLI_UNIQUE_KEY_FLAG`

  Field is part of a unique index.

`MYSQLI_MULTIPLE_KEY_FLAG`

  Field is part of an index.

`MYSQLI_BLOB_FLAG`

  Field is defined as BLOB

`MYSQLI_UNSIGNED_FLAG`

  Field is defined as UNSIGNED

`MYSQLI_ZEROFILL_FLAG`

  Field is defined as ZEROFILL

`MYSQLI_AUTO_INCREMENT_FLAG`

  Field is defined as AUTO_INCREMENT

`MYSQLI_TIMESTAMP_FLAG`

  Field is defined as TIMESTAMP

`MYSQLI_SET_FLAG`

  Field is defined as SET

`MYSQLI_NUM_FLAG`

  Field is defined as NUMERIC

`MYSQLI_PART_KEY_FLAG`

  Field is part of an multi-index

`MYSQLI_GROUP_FLAG`

  Field is part of GROUP BY

`MYSQLI_TYPE_DECIMAL`

  Field is defined as DECIMAL

`MYSQLI_TYPE_NEWDECIMAL`

  Precision math DECIMAL or NUMERIC field (MySQL 5.0.3 and up)

`MYSQLI_TYPE_BIT`

  Field is defined as BIT (MySQL 5.0.3 and up)

`MYSQLI_TYPE_TINY`

  Field is defined as TINYINT

`MYSQLI_TYPE_SHORT`

  Field is defined as SMALLINT

`MYSQLI_TYPE_LONG`

  Field is defined as INT

`MYSQLI_TYPE_FLOAT`

  Field is defined as FLOAT

`MYSQLI_TYPE_DOUBLE`

  Field is defined as DOUBLE

`MYSQLI_TYPE_NULL`

  Field is defined as DEFAULT NULL

`MYSQLI_TYPE_TIMESTAMP`

  Field is defined as TIMESTAMP

`MYSQLI_TYPE_LONGLONG`

  Field is defined as BIGINT

`MYSQLI_TYPE_INT24`

  Field is defined as MEDIUMINT

`MYSQLI_TYPE_DATE`

  Field is defined as DATE

`MYSQLI_TYPE_TIME`

  Field is defined as TIME

`MYSQLI_TYPE_DATETIME`

  Field is defined as DATETIME

`MYSQLI_TYPE_YEAR`

  Field is defined as YEAR

`MYSQLI_TYPE_NEWDATE`

  Field is defined as DATE

`MYSQLI_TYPE_INTERVAL`

  Field is defined as INTERVAL

`MYSQLI_TYPE_ENUM`

  Field is defined as ENUM

`MYSQLI_TYPE_SET`

  Field is defined as SET

`MYSQLI_TYPE_TINY_BLOB`

  Field is defined as TINYBLOB

`MYSQLI_TYPE_MEDIUM_BLOB`

  Field is defined as MEDIUMBLOB

`MYSQLI_TYPE_LONG_BLOB`

  Field is defined as LONGBLOB

`MYSQLI_TYPE_BLOB`

  Field is defined as BLOB

`MYSQLI_TYPE_VAR_STRING`

  Field is defined as VARCHAR

`MYSQLI_TYPE_STRING`

  Field is defined as STRING

`MYSQLI_TYPE_CHAR`

  Field is defined as CHAR

`MYSQLI_TYPE_GEOMETRY`

  Field is defined as GEOMETRY

`MYSQLI_NEED_DATA`

  More data available for bind variable

`MYSQLI_NO_DATA`

  No more data available for bind variable

`MYSQLI_DATA_TRUNCATED`

  Data truncation occurred. Available since PHP 5.1.0 and MySQL 5.0.5.

`MYSQLI_ENUM_FLAG`

  Field is defined as ENUM. Available since PHP 5.3.0.

`MYSQLI_CURSOR_TYPE_FOR_UPDATE`

`MYSQLI_CURSOR_TYPE_NO_CURSOR`

`MYSQLI_CURSOR_TYPE_READ_ONLY`

`MYSQLI_CURSOR_TYPE_SCROLLABLE`

`MYSQLI_STMT_ATTR_CURSOR_TYPE`

`MYSQLI_STMT_ATTR_PREFETCH_ROWS`

`MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH`

`MYSQLI_SET_CHARSET_NAME`

The mysqli Extension and Persistent Connections
The MySQLi Extension Function Summary
Mysqli
PHP Manual