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.

    示例

    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"]);
    }

    以上示例会输出：

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

    参见

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    用户贡献的备注 5 notes

    up
    92
    jcastro at eftec dot cl
    9 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
    up
    2
    darek334 at gazeta dot pl
    1 year ago
    be careful fetch_all(MYSQLI_ASSOC ) returns an array in the form
    <?php
    array(0 => array(...row...), 1 => array(...row...) .... ), even if is one row...
    ?>
    not compared to fetch_assoc() which returns one array of the result in form:
    <?php
    array(...row...)
    ?>
    up
    9
    mail2magvay at rambler dot ru
    5 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)
    up
    9
    m dot amiot at otak-arts dot com
    12 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;
    }
    ?>
    up
    -2
    andrey at php dot net
    14 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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