PHP Manual: mysqli_stmt::attr

Object-oriented style

public function mysqli_stmt::attr_set(int $attribute, int $value): bool

Procedural style

function mysqli_stmt_attr_set(mysqli_stmt $statement, int $attribute, int $value): bool

Used to modify the behavior of a prepared statement. This function may be called multiple times to set several attributes.

statement

Procedural style only: A mysqli_stmt object returned by mysqli_stmt_init().

attribute

The attribute that you want to set. It can have one of the following values:

**Attribute values**
Character	Description
MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH	Setting to `true` causes mysqli_stmt_store_result() to update the metadata `MYSQL_FIELD->max_length` value.
MYSQLI_STMT_ATTR_CURSOR_TYPE	Type of cursor to open for statement when mysqli_stmt_execute() is invoked. `value` can be `MYSQLI_CURSOR_TYPE_NO_CURSOR` (the default) or `MYSQLI_CURSOR_TYPE_READ_ONLY`.
MYSQLI_STMT_ATTR_PREFETCH_ROWS	Number of rows to fetch from server at a time when using a cursor. `value` can be in the range from 1 to the maximum value of unsigned long. The default is 1. Removed as of PHP 8.4.0.

If you use the MYSQLI_STMT_ATTR_CURSOR_TYPE option with MYSQLI_CURSOR_TYPE_READ_ONLY, a cursor is opened for the statement when you invoke mysqli_stmt_execute(). If there is already an open cursor from a previous mysqli_stmt_execute() call, it closes the cursor before opening a new one. mysqli_stmt_reset() also closes any open cursor before preparing the statement for re-execution. mysqli_stmt_free_result() closes any open cursor.

If you open a cursor for a prepared statement, mysqli_stmt_store_result() is unnecessary.

value

The value to assign to the attribute.

Returns true on success or false on failure.

If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

mysqli_stmt::attr_set