(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
面向对象风格
过程化风格
mysqli_fetch_all() fetches all result rows and returns the result set as an associative array, a numeric array, or both.
result仅以过程化样式：由 mysqli_query()， mysqli_store_result() 或 mysqli_use_result()返回的结果集标识。
resulttype
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 MYSQLI_ASSOC,
MYSQLI_NUM, or MYSQLI_BOTH.
Returns an array of associative or numeric arrays holding result rows.
仅可用于 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.
m dot amiot at otak-arts dot com (2012-03-20 10:27:48)
If you really need this function, you can just extend the mysqli_result class with a function like this one.
<?php
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);
else
for ($res = array(); $tmp = $this->fetch_array($resulttype);) $res[] = $tmp;
return $res;
}
?>
windix at gmail dot com (2010-08-25 19:01:20)
If you get an empty set after calling fetch_all(), make sure the result set cursor is reset to the beginning
andrey at php dot net (2010-08-10 07:38:19)
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.
kevin at metalaxe dot com (2009-01-06 13:18:19)
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