If you really need this function, you can just extend the mysqli_result class with a function like this one.
public function fetch_all($resulttype = MYSQLI_NUM)
if (method_exists('mysqli_result', 'fetch_all')) # Compatibility layer with PHP < 5.3
$res = parent::fetch_all($resulttype);
for ($res = array(); $tmp = $this->fetch_array($resulttype);) $res = $tmp;
(PHP 5 >= 5.3.0)
mysqli_result::fetch_all -- mysqli_fetch_all — Fetches all result rows as an associative array, a numeric array, or both
Object oriented style
$resulttype= MYSQLI_NUM ] )
mysqli_fetch_all() fetches all result rows and returns the result set as an associative array, a numeric array, or both.
This optional parameter is a constant indicating what type of array should be produced from the current row data. The possible values for this parameter are the constants
Returns an array of associative or numeric arrays holding result rows.
MySQL Native Driver Only
Available only with mysqlnd.
As mysqli_fetch_all() returns all the rows as an array in a single step, it may consume more memory than some similar functions such as mysqli_fetch_array(), which only returns one row at a time from the result set. Further, if you need to iterate over the result set, you will need a looping construct that will further impact performance. For these reasons mysqli_fetch_all() should only be used in those situations where the fetched result set will be sent to another layer for processing.
If you are getting the following error:
Fatal error: Call to undefined method mysqli_result::fetch_all()
Be sure you didn't miss this line after the procedural call about it requiring mysqlnd
Return value changed in 5.3.3 - between 5.3.0 and 5.3.2 (incl.) when the result set was empty NULL was returned. 5.3.3+ returns an empty array.
Also, mysqli_fetch_all works only for buffered result sets, which are the default for mysqli_query. MYSQLI_USE_RESULT will be supported in 5.3.4+
However, it makes little sense to use it this way, materialising unbuffered sets. In this case choose STORE_RESULT, and fetch_all won't copy the data, but reference it, as it is stored already in mysqlnd.