(PHP 5, PHP 7, PHP 8)

mysqli_stmt::send_long_data -- mysqli_stmt_send_long_dataSend data in blocks


Stile orientato agli oggetti

public mysqli_stmt::send_long_data(int $param_num, string $data): bool

Stile procedurale

mysqli_stmt_send_long_data(mysqli_stmt $statement, int $param_num, string $data): bool

Allows to send parameter data to the server in pieces (or chunks), e.g. if the size of a blob exceeds the size of max_allowed_packet. This function can be called multiple times to send the parts of a character or binary data value for a column, which must be one of the TEXT or BLOB datatypes.

Elenco dei parametri


Solo nello stile procedurale: un identificatore di statement restituito da mysqli_stmt_init().


Indicates which parameter to associate the data with. Parameters are numbered beginning with 0.


A string containing data to be sent.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.


Example #1 Stile orientato agli oggetti

$mysqli->prepare("INSERT INTO messages (message) VALUES (?)");
$null NULL;
$fp fopen("messages.txt""r");
while (!
feof($fp)) {

Vedere anche:

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User Contributed Notes 4 notes

Gustavo Narea
16 years ago
Just in case:

'max_allowed_packet' is a MySQL variable; it is not a PHP function/variable/constant.

Further info:

3 years ago
If you are trying to write a single field which is above max_allowed_packet then this function will not help you (contrary to what the documentation example seems to show above).

Parameters in MySQL are still restricted by max_allowed_packet on a per-field basis so you will get an error like:

“mysqli_sql_exception: Parameter of prepared statement which is set through mysql_send_long_data() is longer than 'max_long_data_size' bytes”

The only real use case for this function seems to be if you are writing multiple long fields which when combined would go over max_allowed_packet.
1 year ago
To ChrisH's note, you must call this function multiple times with the same $param_nr, to send the first max_allowed_packet bytes, then the next, and so on. So you might need to do a for loop over changing substr() indexes, or etc.
lussnig at smcc dot de
17 years ago
send_long_data() these function is normaly used to store Data in Binary blob field. But if the table is UTF8 and connection charset it does not expect binary data (for example images) it take utf8 Data.
This mean you have to do utf8_encode bevore sending binary data.
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