This parameter (and presumably any other parameter in mysqli_stmt) will raise an error with the message "Property access is not allowed yet" if the statement was not prepared properly, or not prepared at all.
To prevent this, always ensure that the return value of the "prepare" statement is true before accessing these properties.
mysqli_stmt::$param_count
mysqli_stmt_param_count
(PHP 5, PHP 7)
mysqli_stmt::$param_count -- mysqli_stmt_param_count — Returns the number of parameters for the given statement
Descrição
Estilo orientado à objeto
Estilo procedural
Returns the number of parameter markers present in the prepared statement.
Parâmetros
-
stmt -
Somente no estilo procedural: Um recurso statement retornado por mysqli_stmt_init().
Valor Retornado
Returns an integer representing the number of parameters.
Exemplos
Exemplo #1 Estilo orientado à objeto
<?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();
?>
Exemplo #2 Estilo procedural
<?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);
?>
Os exemplos acima irão imprimir:
Statement has 2 markers.
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User Contributed Notes 1 note
Senthryl ¶
15 years ago
