PHP - Manual: mysqli_result::fetch_all

2024-04-29

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mysqli_result::fetch_all

mysqli_fetch_all

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

mysqli_result::fetch_all -- mysqli_fetch_all — Fetch 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 $mode = MYSQLI_NUM): array

过程化风格

mysqli_fetch_all(mysqli_result $result, int $mode = MYSQLI_NUM): array

Returns a two-dimensional array of all result rows as an associative array, a numeric array, or both.

注意:
Prior to PHP 8.1.0, available only with mysqlnd.

参数

result: 仅以过程化样式：由 mysqli_query()、mysqli_store_result()、 mysqli_use_result()、mysqli_stmt_get_result() 返回的 mysqli_result 对象。
mode: 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.

返回值

Returns an array of associative or numeric arrays holding result rows.

更新日志

版本	说明
8.1.0	Now also available when linking against libmysqlclient.

范例

示例 #1 mysqli_result::fetch_all() example

面向对象风格


<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

$result = $mysqli->query("SELECT Name, CountryCode FROM City ORDER BY ID LIMIT 3");

$rows = $result->fetch_all(MYSQLI_ASSOC);
foreach ($rows as $row) {
    printf("%s (%s)\n", $row["Name"], $row["CountryCode"]);
}

过程化风格


<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = mysqli_connect("localhost", "my_user", "my_password", "world");

$result = mysqli_query($mysqli, "SELECT Name, CountryCode FROM City ORDER BY ID LIMIT 3");

$rows = mysqli_fetch_all($result, MYSQLI_ASSOC);
foreach ($rows as $row) {
    printf("%s (%s)\n", $row["Name"], $row["CountryCode"]);
}

以上例程会输出：

Kabul (AFG)
Qandahar (AFG)
Herat (AFG)

参见

mysqli_fetch_array() - Fetch the next row of a result set as an associative, a numeric array, or both
mysqli_fetch_column() - Fetch a single column from the next row of a result set
mysqli_query() - 对数据库执行一次查询

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User Contributed Notes 4 notes

down

jcastro at eftec dot cl ¶

7 years ago


I tested using "fetch all" versus "while / fetch array" and :

fetch-all uses less memory (but not for so much).

In my case (test1 and test2): 147008,262848 bytes (fetch-all) versus 147112,262888 bytes (fetch-array & while.

So, about the memory, in both cases are the same.

However, about the performance
My test takes :350ms (worst case) using fetch-all, while it takes 464ms (worst case) using fetch-array, or about 35% worst using fetch array and a while cycle.

So, using fetch-all, for a normal code that returns a moderate amount of information is :
a) cleaner (a single line of code)
b) uses less memory (about 0.01% less)
c) faster.

php 5.6 32bits, windows 8.1 64bits

down

mail2magvay at rambler dot ru ¶

3 years ago


By the way, this case pretty work's too:

$services = $mysqli->query("SELECT * FROM table1");

if($services && $services->num_rows>0){
    $services->fetch_all(MYSQLI_ASSOC);
}

foreach($services as $service){
    echo $service; //work properly, cause it implements Iterator  
}

That's mean in this case $services is a valid array (or empty array)

down

m dot amiot at otak-arts dot com ¶

10 years ago


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;
        }
?>

down

andrey at php dot net ¶

11 years ago


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.

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官方地址：https://www.php.net/manual/en/mysqli-result.fetch-all.php

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mysqli_result::fetch_all

mysqli_fetch_all

说明

参数

返回值

更新日志

范例

参见

User Contributed Notes 4 notes