Php/docs/mysqli-result.fetch-all
mysqli_result::fetch_all
mysqli_fetch_all
(PHP 5 >= 5.3.0, PHP 7)
mysqli_result::fetch_all -- mysqli_fetch_all — Fetches all result rows as an associative array, a numeric array, or both
说明
面向对象风格
public mysqli_result::fetch_all
([ int $resulttype = MYSQLI_NUM
] ) : mixed
过程化风格
mysqli_fetch_all
( mysqli_result $result
[, int $resulttype = MYSQLI_NUM
] ) : mixed
mysqli_fetch_all() fetches all result rows and returns the result set as an associative array, a numeric array, or both.
参数
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, orMYSQLI_BOTH.
返回值
Returns an array of associative or numeric arrays holding result rows.
仅 MySQL 原生驱动
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.
参见
- mysqli_fetch_array() - Fetch a result row as an associative, a numeric array, or both
- mysqli_query() - 对数据库执行一次查询
