Copyright 1997-2021 the PHP Documentation Group.
mysqli_stmt::bind_param
mysqli_stmt_bind_param
Binds variables to a prepared statement as parameters
Description
Object oriented style
public bool mysqli_stmt::bind_param(string types,
mixed var,
mixed vars);
Procedural style
bool mysqli_stmt_bind_param(mysqli_stmt stmt,
string types,
mixed var,
mixed vars);
Bind variables for the parameter markers in the SQL statement
that was passed to
mysqli_prepare
.
If data size of a variable exceeds max. allowed packet size
(max_allowed_packet), you have to specify b
in types
and use
mysqli_stmt_send_long_data
to send the data in packets.
Care must be taken when using
mysqli_stmt_bind_param
in conjunction with
call_user_func_array
.
Note that
mysqli_stmt_bind_param
requires parameters to be passed by reference, whereas
call_user_func_array
can accept as a parameter a list of variables that can
represent references or values.
Parameters
-
stmt
Procedural style only: A statement identifier returned by
mysqli_stmt_init
.-
types
A string that contains one or more characters which specify the types for the corresponding bind variables:
Table 7.14 Type specification chars
Character Description i corresponding variable has type integer d corresponding variable has type double s corresponding variable has type string b corresponding variable is a blob and will be sent in packets
-
var
,vars
The number of variables and length of string
types
must match the parameters in the statement.
Return Values
Returns true
on success or
false
on failure.
Examples
Example 7.79 Object oriented style
<?php
$mysqli = new mysqli('localhost', 'my_user', 'my_password', 'world');
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$stmt = $mysqli->prepare("INSERT INTO CountryLanguage VALUES (?, ?, ?, ?)");
$stmt->bind_param('sssd', $code, $language, $official, $percent);
$code = 'DEU';
$language = 'Bavarian';
$official = "F";
$percent = 11.2;
/* execute prepared statement */
$stmt->execute();
printf("%d Row inserted.\n", $stmt->affected_rows);
/* close statement and connection */
$stmt->close();
/* Clean up table CountryLanguage */
$mysqli->query("DELETE FROM CountryLanguage WHERE Language='Bavarian'");
printf("%d Row deleted.\n", $mysqli->affected_rows);
/* close connection */
$mysqli->close();
?>
Example 7.80 Procedural style
<?php
$link = mysqli_connect('localhost', 'my_user', 'my_password', 'world');
/* check connection */
if (!$link) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$stmt = mysqli_prepare($link, "INSERT INTO CountryLanguage VALUES (?, ?, ?, ?)");
mysqli_stmt_bind_param($stmt, 'sssd', $code, $language, $official, $percent);
$code = 'DEU';
$language = 'Bavarian';
$official = "F";
$percent = 11.2;
/* execute prepared statement */
mysqli_stmt_execute($stmt);
printf("%d Row inserted.\n", mysqli_stmt_affected_rows($stmt));
/* close statement and connection */
mysqli_stmt_close($stmt);
/* Clean up table CountryLanguage */
mysqli_query($link, "DELETE FROM CountryLanguage WHERE Language='Bavarian'");
printf("%d Row deleted.\n", mysqli_affected_rows($link));
/* close connection */
mysqli_close($link);
?>
The above examples will output:
1 Row inserted. 1 Row deleted.
See Also
mysqli_stmt_bind_result
|
mysqli_stmt_execute
|
mysqli_stmt_fetch
|
mysqli_prepare
|
mysqli_stmt_send_long_data
|
mysqli_stmt_errno
|
mysqli_stmt_error
|