mysqli_stmt_num_rows
Returns the number of rows buffered in the statement. This function will only work after mysqli_stmt_store_result() is called to buffer the entire result set in the statement handle.
This function returns 0 unless all rows have been fetched from the server.
Parameters
Procedural style only: A mysqli_stmt object returned by mysqli_stmt_init() .
Return Values
An int representing the number of buffered rows. Returns 0 in unbuffered mode unless all rows have been fetched from the server.
Note:
If the number of rows is greater than PHP_INT_MAX , the number will be returned as a string .
Examples
Example #1 Object-oriented style
mysqli_report ( MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT );
$mysqli = new mysqli ( «localhost» , «my_user» , «my_password» , «world» );
$query = «SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20» ;
$stmt = $mysqli -> prepare ( $query );
$stmt -> execute ();
/* store the result in an internal buffer */
$stmt -> store_result ();
printf ( «Number of rows: %d.\n» , $stmt -> num_rows );
Example #2 Procedural style
mysqli_report ( MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT );
$link = mysqli_connect ( «localhost» , «my_user» , «my_password» , «world» );
$query = «SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20» ;
$stmt = mysqli_prepare ( $link , $query );
mysqli_stmt_execute ( $stmt );
/* store the result in an internal buffer */
mysqli_stmt_store_result ( $stmt );
printf ( «Number of rows: %d.\n» , mysqli_stmt_num_rows ( $stmt ));
The above examples will output:
See Also
- mysqli_stmt_store_result() — Stores a result set in an internal buffer
- mysqli_stmt_affected_rows() — Returns the total number of rows changed, deleted, inserted, or matched by the last statement executed
- mysqli_prepare() — Prepares an SQL statement for execution
User Contributed Notes 1 note
Please be advised, for people who sometimes miss to read this important Manual entry for this function:
If you do not use mysqli_stmt_store_result( ), and immediatley call this function after executing a prepared statement, this function will usually return 0 as it has no way to know how many rows are in the result set as the result set is not saved in memory yet.
mysqli_stmt_store_result( ) saves the result set in memory thus you can immedietly use this function after you both execute the statement AND save the result set.
If you do not save the result set but still want to use this function you have to actually loop through the result set one row at a time using mysqli_stmt_fetch( ) before using this function to determine the number of rows.
A thought though, if you want to determine the number of rows without storing the result set and after looping through it, why not just simply keep an internal counter in your loop every time a row is fetched and save the function call.
In short, this function is only really useful if you save the result set and want to determine the number of rows before looping through it, otherwise you can pretty much recreate its use like I suggested.
mysqli_num_rows
The behaviour of mysqli_num_rows() depends on whether buffered or unbuffered result sets are being used. This function returns 0 for unbuffered result sets unless all rows have been fetched from the server.
Parameters
Return Values
An int representing the number of fetched rows. Returns 0 in unbuffered mode unless all rows have been fetched from the server.
Note:
If the number of rows is greater than PHP_INT_MAX , the number will be returned as a string .
Examples
Example #1 Object-oriented style
mysqli_report ( MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT );
$mysqli = new mysqli ( «localhost» , «my_user» , «my_password» , «world» );
$result = $mysqli -> query ( «SELECT Code, Name FROM Country ORDER BY Name» );
/* Get the number of rows in the result set */
$row_cnt = $result -> num_rows ;
printf ( «Result set has %d rows.\n» , $row_cnt );
Example #2 Procedural style
mysqli_report ( MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT );
$link = mysqli_connect ( «localhost» , «my_user» , «my_password» , «world» );
$result = mysqli_query ( $link , «SELECT Code, Name FROM Country ORDER BY Name» );
/* Get the number of rows in the result set */
$row_cnt = mysqli_num_rows ( $result );
printf ( «Result set has %d rows.\n» , $row_cnt );
The above examples will output:
Notes
Note:
In contrast to the mysqli_stmt_num_rows() function, this function doesn’t have object-oriented method variant. In the object-oriented style, use the getter property.
See Also
- mysqli_affected_rows() — Gets the number of affected rows in a previous MySQL operation
- mysqli_store_result() — Transfers a result set from the last query
- mysqli_use_result() — Initiate a result set retrieval
- mysqli_query() — Performs a query on the database
- mysqli_stmt_num_rows() — Returns the number of rows fetched from the server
User Contributed Notes 3 notes
If you have problems making work this num_rows, you have to declare ->store_result() first.
$mysqli = new mysqli ( «localhost» , «root» , «» , «tables» );
$query = $mysqli -> prepare ( «SELECT * FROM table1» );
$query -> execute ();
$query -> store_result ();
This function doesn’t work with LIMIT used jointly with SQL_CALC_FOUND_ROWS. If you want to obtain the total rows found you must do it manually, example:
public function errorList ( int $limit = 25 , int $offset = 0 ) $errorList = array();
$result = $this -> con -> query ( «SELECT SQL_CALC_FOUND_ROWS id, erreur FROM Erreurs ORDER BY id DESC LIMIT $limit OFFSET $offset » );
while( $row = $result -> fetch_assoc ()) $errorList [] = new Erreur ( $row );
>
$result -> free ();
// $foundRows = $result->num_rows; // 25
$foundRows = $this -> con -> query ( «SELECT FOUND_ROWS() as foundRows» );
$this -> foundRows = $foundRows -> fetch_assoc (); // 178
return $errorList ;
>
?>
in php 5.3.8 had unexpected troubles when checking for mysqli_result::$num_rows
If the result of the query is empty then var_dump of the result will be like this:
class mysqli_result#5 (5) public $current_field => NULL
public $field_count => NULL
public $lengths => NULL
public $num_rows => NULL
public $type => NULL
>
but var_dump($result->num_rows) will give integer-typed zero instead of NULL:
int(0)
Php mysql counting rows
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