Php/docs/mysqli-stmt.param-count
mysqli_stmt::$param_count
mysqli_stmt_param_count
(PHP 5, PHP 7)
mysqli_stmt::$param_count -- mysqli_stmt_param_count — Returns the number of parameter for the given statement
说明
面向对象风格
int $mysqli_stmt->param_count;
过程化风格
mysqli_stmt_param_count
( mysqli_stmt $stmt
) : int
Returns the number of parameter markers present in the prepared statement.
返回值
Returns an integer representing the number of parameters.
范例
Example #1 面向对象风格
<?php$mysqli = new mysqli("localhost", "my_user", "my_password", "world");/* check connection */if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit();}if ($stmt = $mysqli->prepare("SELECT Name FROM Country WHERE Name=? OR Code=?")) { $marker = $stmt->param_count; printf("Statement has %d markers.\n", $marker); /* close statement */ $stmt->close();}/* close connection */$mysqli->close();?>
Example #2 过程化风格
<?php$link = mysqli_connect("localhost", "my_user", "my_password", "world");/* check connection */if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit();}if ($stmt = mysqli_prepare($link, "SELECT Name FROM Country WHERE Name=? OR Code=?")) { $marker = mysqli_stmt_param_count($stmt); printf("Statement has %d markers.\n", $marker); /* close statement */ mysqli_stmt_close($stmt);}/* close connection */mysqli_close($link);?>
以上例程会输出：
Statement has 2 markers.
