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    mysqli_stmt::bind_result

    mysqli_stmt_bind_result

    (PHP 5, PHP 7, PHP 8)

    mysqli_stmt::bind_result -- mysqli_stmt_bind_result — Lie des variables à un jeu de résultats

    Description

    Style orienté objet

    public mysqli_stmt::bind_result(mixed &$var, mixed &...$vars): bool

    Style procédural

    mysqli_stmt_bind_result(mysqli_stmt $statement, mixed &$var, mixed &...$vars): bool

    Associe des colonnes d'un résultat à des variables.

    Lorsque mysqli_stmt_fetch() est appelée pour lire des valeurs, le protocole MySQL place les données dans les variables spécifiées var/vars.

    Une colonne peut être liée ou reliée à tout moment, même après qu'un jeu de résultats ait été partiellement récupéré. La nouvelle liaison prend effet la prochaine fois que la mysqli_stmt_fetch() est appelée.

    Note:

    Toutes les colonnes doivent être liées après l'exécution de la fonction mysqli_stmt_execute() et avant l'appel à la fonction mysqli_stmt_fetch(). En fonction du type de valeur de la colonne, le type de variable PHP peut être automatiquement modifié.

    Note:

    Une colonne peut être associée ou réassociée à tout moment, même après une lecture partielle du résultat. La nouvelle association prend effet au prochain appel de mysqli_stmt_fetch().

    Astuce

    Cette fonction est utile pour les résultats basiques. Pour récupérer un ensemble de résultats itérable, ou récupérer chaque ligne sous forme de tableau ou d'objet, utilisez la mysqli_stmt_get_result().

    Liste de paramètres

    statement

    Style procédural uniquement : Un objet mysqli_stmt retourné par la fonction mysqli_stmt_init().

    var

    La première variable à lier.

    vars

    Variables supplémentaire à lier.

    Valeurs de retour

    Cette fonction retourne true en cas de succès ou false si une erreur survient.

    Exemples

    Exemple #1 Style orienté objet

    <?php

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

    /* Préparation de la requête */
    $stmt = $mysqli->prepare("SELECT Code, Name FROM Country ORDER BY Name LIMIT 5");
    $stmt->execute();

    /* Lier des variables à une déclaration préparée */
    $stmt->bind_result($col1, $col2);

    /* Récupération des valeurs */
    while ($stmt->fetch()) {
    printf("%s %s\n", $col1, $col2);
    }
    ?>

    Exemple #2 Style procédural

    <?php

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

    /* Préparation de la requête */
    $stmt = mysqli_prepare($link, "SELECT Code, Name FROM Country ORDER BY Name LIMIT 5");
    mysqli_stmt_execute($stmt);

    /* Lier des variables à une déclaration préparée */
    mysqli_stmt_bind_result($stmt, $col1, $col2);

    /* Récupération des valeurs */
    while (mysqli_stmt_fetch($stmt)) {
    printf("%s %s\n", $col1, $col2);
    }
    ?>

    L'exemple ci-dessus va afficher :

    AFG Afghanistan
ALB Albania
DZA Algeria
ASM American Samoa
AND Andorra

    Voir aussi

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    ＋add a note

    User Contributed Notes 17 notes

    up
    58
    hamidhossain at gmail dot com
    16 years ago
    lot of people don't like how bind_result works with prepared statements! it requires you to pass long list of parameters which will be loaded with column value when the function being called.

    To solve this, i used call_user_func_array function and result_metadata functions. which make easy and automatically returns an array of all columns results stored in an array with column names.

    please don't forget to change setting variables with your own credentials:

    <?php
    $host     = 'localhost';
    $user = 'root';
    $pass = '1234';
    $data = 'test';

    $mysqli = new mysqli($host, $user, $pass, $data);
    /* check connection */
    if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
    }

    if (    $stmt = $mysqli->prepare("SELECT * FROM sample WHERE t2 LIKE ?")) {
    $tt2 = '%';

    $stmt->bind_param("s", $tt2);
    $stmt->execute();

    $meta = $stmt->result_metadata();
    while (    $field = $meta->fetch_field())
    {
    $params[] = &$row[$field->name];
    }

    call_user_func_array(array($stmt, 'bind_result'), $params);

    while (    $stmt->fetch()) {
    foreach(    $row as $key => $val)
    {
    $c[$key] = $val;
    }
    $result[] = $c;
    }

    $stmt->close();
    }
    $mysqli->close();
    print_r($result);
    ?>
    up
    34
    nieprzeklinaj at gmail dot com
    13 years ago
    I wrote a function that fetches all rows from a result set - either normal or prepared.

    <?php
    function fetch($result)
    {
    $array = array();

    if(    $result instanceof mysqli_stmt)
    {
    $result->store_result();

    $variables = array();
    $data = array();
    $meta = $result->result_metadata();

    while(    $field = $meta->fetch_field())
    $variables[] = &$data[$field->name]; // pass by reference

    call_user_func_array(array($result, 'bind_result'), $variables);

    $i=0;
    while(    $result->fetch())
    {
    $array[$i] = array();
    foreach(    $data as $k=>$v)
    $array[$i][$k] = $v;
    $i++;

    // don't know why, but when I tried $array[] = $data, I got the same one result in all rows
    }
    }
    elseif(    $result instanceof mysqli_result)
    {
    while(    $row = $result->fetch_assoc())
    $array[] = $row;
    }

    return     $array;
    }
    ?>

    Simply call it passing a result set or executed statement and you'll get all rows fetched.
    up
    16
    andrey at php dot net
    19 years ago
    If you select LOBs use the following order of execution or you risk mysqli allocating more memory that actually used

    1)prepare()
    2)execute()
    3)store_result()
    4)bind_result()

    If you skip 3) or exchange 3) and 4) then mysqli will allocate memory for the maximal length of the column which is 255 for tinyblob, 64k for blob(still ok), 16MByte for MEDIUMBLOB - quite a lot and 4G for LONGBLOB (good if you have so much memory). Queries which use this order a bit slower when there is a LOB but this is the price of not having memory exhaustion in seconds.
    up
    7
    quano
    13 years ago
    If I have a longtext field in the result, the whole page will go blank, without giving me any errors what so ever. This is because PHP _crashes_. I've spent an entire morning figuring this out.

    Apparently, if you have longtext present, you HAVE to call store_result before using bind_result.

    http://bugs.php.net/bug.php?id=47928
    up
    13
    uramihsayibok, gmail, com
    15 years ago
    A note to people to want to return an array of results - that is, an array of all the results from the query, not just one at a time.

    <?php

    // blah blah...
    call_user_func_array(array($mysqli_stmt_object, "bind_result"), $byref_array_for_fields);

    $results = array();
    while (    $mysqli_stmt_object->fetch()) {
    $results[] = $byref_array_for_fields;
    }

    ?>
    This will NOT work. $results will have a bunch of arrays, but each one will have a reference to $byref.

    PHP is optimizing performance here: you aren't so much copying the $byref array into $results as you are *adding* it. That means $results will have a bunch of $byrefs - the same array repeated multiple times. (So what you see is that $results is all duplicates of the last item from the query.)

    hamidhossain (01-Sep-2008) shows how to get around that: inside the loop that fetches results you also have to loop through the list of fields, copying them as you go. In effect, copying everything individually.

    Personally, I'd rather use some kind of function that effectively duplicates an array than write my own code. Many of the built-in array functions don't work, apparently using references rather than copies, but a combination of array_map and create_function does.

    <?php

    // blah blah...
    call_user_func_array(array($mysqli_stmt_object, "bind_result"), $byref_array_for_fields);

    // returns a copy of a value
    $copy = create_function('$a', 'return $a;');

    $results = array();
    while (    $mysqli_stmt_object->fetch()) {
    // array_map will preserve keys when done here and this way
    $results[] = array_map($copy, $byref_array_for_fields);
    }

    ?>

    All these problems would go away if they just implemented a fetch_assoc or even fetch_array for prepared statements...
    up
    3
    atulkashyap1 at hotmail dot com
    15 years ago
    bind_ result can also be used to return an array of variables from a function,
    This took me a long time to figure out, so I would like to share this.

    <?php
    function extracting(){
    $query="SELECT topic, detail, date, tags
    FROM updates
    ORDER BY date DESC
    LIMIT 5 "    ;
    if(    $stmt = $this->conn->prepare($query)) {
    $stmt->execute();
    $stmt->bind_result($updates[0],$updates[1],$updates[2],$updates[3]);
    $i=0;
    while(    $stmt->fetch()){
    $i++;
    $name='t'.$i;
    $    $name = array($updates[0],$updates[1],$updates[2],$updates[3]);
    }
    return array(    $t1,$t2,$t3,$t4,$t5,);
    $stmt->close();
    }
    }
    ?>
    up
    4
    kaspy at example dot com
    9 years ago
    For those of you trying to bind rows into array,
    <?php
    $stmt     = $db->prepare('SELECT id, name, mail, phone, FROM contacts');
    $stmt->execute();
    $stmt->store_result();
    $stmt->bind_result($arr['id'], $arr['name'], $arr['mail'], $arr['phone']);
    while (    $stmt->fetch()) {
    $outArr[] = $arr;
    }
    $stmt->close();
    return     $outArr;
    ?>
    this will give you all the rows you asked for except that they would all be the same as the first one because of some gremlins in the background code (i've heard that PHP is trying to save memory here).

    But this one works:
    <?php
    $stmt     = $db->prepare('SELECT id, name, mail, phone, FROM contacts');
    $stmt->execute();
    $stmt->store_result();
    $stmt->bind_result($a,$b,$c,$d);
    while (    $stmt->fetch()) {
    $outArr[] = ['id' => $a, 'name' => $b, 'mail' => $c, 'phone' => $d];
    }
    $stmt->close();
    return     $outArr;
    ?>
    Just don't use arrays to bind results :)
    up
    1
    scragar at gmail dot com
    13 years ago
    To clarify for anyone having problems with arrays, PHP will automatically pass arrays as references, cloning the array if needed in the event of setting or unsetting a part of it, changing a referenced variable does not trigger cloning.

    This is done for efficiency, to clone an array containing this information you may either use a foreach loop, or set/unset a key. Techniques like array_values will also work provided you don't mind losing your keys.
    up
    1
    pcc at pccglobal dot com
    14 years ago
    If done properly, 'call_user_func_array()' works to bind variables to a result of multiple columns including BLOB columns.

    EXAMPLE:

    <?php
    $data     = array() ; // Array that accepts the data.
    $params = array() ; // Parameter array passed to 'bind_result()'
    $column = array("fidentity", "fvarchar", "fdate", "ftinyblob") ; // The column names.
    foreach($column as $col_name)
    {
    // 'fetch()' will assign fetched value to the variable '$data[$col_name]'
    $params[] =& $data[$col_name] ;
    }
    $res = call_user_func_array(array($stmt, "bind_result"), $params) ;
    ?>

    Here's the complete example.
    WARNING: When using 'prepare' to prepare a statement to retrieve LOBs the method order matters.
    Also, method 'store_result()' must be called and be called in correct order.
    Failure to observe this causes PHP/MySQLi to crash or return an erroneous value.
    The proper procedure order is: prepare -> execute -> store_result -> bind -> fetch

    <?php
    $database     = "test" ;
    $table = "test" ;
    $column = array("fidentity", "fvarchar", "fdate", "ftinyblob") ;
    $select_set = "`fidentity`, `fvarchar`, `fdate`, `ftinyblob`" ;
    $mysqli = new mysqli("localhost", "root", $password, $database);
    // Proper procedure order: prepare -> execute -> store_result -> bind -> fetch
    $stmt = $mysqli->prepare("SELECT $select_set FROM `$table`") ;
    $stmt->execute();
    $stmt->store_result();
    $data = array() ; // Array that accepts the data.
    $params = array() ; // Parameter array passed to 'bind_result()'
    foreach($column as $col_name)
    {
    // Assign the fetched value to the variable '$data[$name]'
    $params[] =& $data[$col_name] ;
    }
    $res = call_user_func_array(array($stmt, "bind_result"), $params) ;
    if(!     $res)
    {
    echo     "bind_result() failed: " . $mysqli->error . "\n" ;
    }
    else
    {
    $res = $stmt->fetch() ;
    if(    $res)
    {
    echo     "<pre>" . htmlentities(print_r($data, true)) . "</pre>\n" ;
    }
    else
    {
    echo ((    false !== $res) ? "End of data" : $stmt->error) . "\n" ;
    }
    }
    $stmt->close() ;
    $mysqli->close() ;
    exit ;
    ?>

    The above example should output:
    Array (
    [fidentity] => 24
    [fvarchar] => the rain in spain
    [fdate] => 2010-07-31
    [ftinyblob] => GIF89a...(more BLOB data)
    )
    up
    5
    timchampion dot NOSPAM at gmail dot com
    12 years ago
    Just wanted to make sure that all were aware of get_result for those needing the result in array format.

    In the code sample, after execute(), perform a get_result() like this:

    <?php

    // ... this document's example code:

    $stmt->execute();

    /* instead of bind_result: */
    $result = $stmt->get_result();

    /* now you can fetch the results into an array - NICE */
    while ($myrow = $result->fetch_assoc()) {
    printf("%s %s\n", $myrow['Code'], $myrow['Name']);
    }

    ?>

    This is much nicer when you have a dozen or more fields coming back from your query. Hope this helps. Also, as noted in the comments for get_result, it requires mysqlnd.
    up
    2
    Masterkitano
    9 years ago
    for people who doesn't have the mysqlInd driver or for some reason just can't use the stmt->get_result, I've made this function which allows you to "mimic" the mysqli_result::fetch_assoc:

    function fetchAssocStatement($stmt)
    {
    if($stmt->num_rows>0)
    {
    $result = array();
    $md = $stmt->result_metadata();
    $params = array();
    while($field = $md->fetch_field()) {
    $params[] = &$result[$field->name];
    }
    call_user_func_array(array($stmt, 'bind_result'), $params);
    $stmt->fetch();
    return $result;
    }

    return null;
    }

    you can use it in a while sentence to fetch and return an assoc array from the statement (as long as the statement is open):
    usage:
    $statement = $mysqli->prepare($query));
    $statement.execute();
    while($rowAssocArray = fetchAssocStatement($statement))
    {
    //do something
    }

    $statement.close();

    hope this helps.
    up
    1
    carloshritzmann at gmail dot com
    2 years ago
    From PHP 7.4+, you can use the spread operator (...) to easily automate the process of assigning variables to the query statement, and to fetch data when executing a SELECT request using prepared statements.

    However, the spread operator takes in consideration the size of the array. So it must be pre allocated before used in any context.

    <?php
    $link     = // Create DB Connection

    $query_text = "SELECT mission, year, report FROM table WHERE id=? AND name=?;";

    // Data to assign
    $types = "is";
    $param = [0, "John Titor"];

    // Prepare and Execute Statement
    $stmt = mysqli_stmt_prepare($link, $query_text);
    if (    mysqli_stmt_execute($stmt)) {

    // We know we are going to retrieve 3 columns: Mission, Year and Report.
    $output = [0, 0, 0];

    // Behind the scenes, the spread operator gives this idea when used:
    // mysqli_stmt_bind_result($link, $output[0], $output[1], $output[2]);
    mysqli_stmt_bind_result($stmt, ...$output);

    // Fetch data
    while (mysqli_stmt_fetch($stmt)) {
    echo     "Mission: " . $output[0] . "\n";
    echo     "Year: " . $output[1] ."\n";
    echo     "Report: " . $output[2] . "\n";
    }

    } else {
    echo     "Error: Wrong Timeline\n";
    }

    // Close DB Connection
    ?>
    up
    1
    dev+php at alepe dot com
    13 years ago
    According to the above documentation:
    "Depending on column types bound variables can silently change to the corresponding PHP type. "

    if you specify a field as int (tinyint, mediumint, etc.) with zerofill property, it will be converted (silently) to PHP integer (erasing the leading zeros). In order to keep those leading zeros, one solution is to specify the field as decimal.

    Note that this only happens when using prepared statements and not when executing the query directly.
    up
    1
    Miguel Hatrick
    15 years ago
    Took some cool code from here and made a little class for those object oriented kind of guys

    used like this:

    <?php
    // execute prepared statement
    $stmt->execute();
    $stmt->store_result();

    //custom class :D bind to Statement Result mambo jambo!
    $sr = new Statement_Result($stmt);

    $stmt->fetch();
    printf("ID: %d\n", $sr->Get('id') );

    /////////////////////////////////

    class Statement_Result
    {
    private     $_bindVarsArray = array();
    private     $_results = array();

    public function     __construct(&$stmt)
    {
    $meta = $stmt->result_metadata();

    while (    $columnName = $meta->fetch_field())
    $this->_bindVarsArray[] = &$this->_results[$columnName->name];

    call_user_func_array(array($stmt, 'bind_result'), $this->_bindVarsArray);

    $meta->close();
    }

    public function     Get_Array()
    {
    return     $this->_results;
    }

    public function     Get($column_name)
    {
    return     $this->_results[$column_name];
    }
    }
    ?>
    up
    1
    bb at servertje dot nl
    16 years ago
    Although inspired by an earlier post, this method could be added to any of your database objects. It's an object oriented implementation of an earlier post.

    The method returns an array with objects representing a row. Each property represents a column and its value.

    <?php
    private function getresult($stmt)
    {
    $result = array();

    $metadata = $stmt->result_metadata();
    $fields = $metadata->fetch_fields();

    for (;;)
    {
    $pointers = array();
    $row = new stdClass();

    $pointers[] = $stmt;
    foreach (    $fields as $field)
    {
    $fieldname = $field->name;
    $pointers[] = &$row->$fieldname;
    }

    call_user_func_array(mysqli_stmt_bind_result, $pointers);

    if (!    $stmt->fetch())
    break;

    $result[] = $row;
    }

    $metadata->free();

    return     $result;
    }
    ?>
    up
    0
    brad dot jackson at resiideo dot com
    19 years ago
    A potential problem exists in binding result parameters from a prepared statement which reference large datatypes like mediumblobs. One of our database tables contains a table of binary image data. Our largest image in this table is around 50Kb, but even so the column is typed as a mediumblob to allow for files larger than 64Kb. I spent a frustrating hour trying to figure out why mysqli_stmt_bind_result choked while trying to allocate 16MB of memory for what should have been at most a 50Kb result, until I realized the function is checking the column type first to find out how big a result _might_ be retrieved, and attempting to allocate that much memory to contain it. My solution was to use a more basic mysqli_result() query. Another option might have been to retype the image data column as blob (64Kb limit).
    up
    -2
    thejkwhosaysni at gmail dot com
    19 years ago
    I've created these functions which will act like mysqli_fetch_array() and mysqli_fetch_object() but work with bound results.

    <?php
    function fetch_object() {
    $data = mysqli_stmt_result_metadata($this->stmt);
    $count = 1; //start the count from 1. First value has to be a reference to stmt.
    $fieldnames[0] = &$this->stmt;
    $obj = new stdClass;
    while (    $field = mysqli_fetch_field($data)) {
    $fn = $field->name; //get all the feild names
    $fieldnames[$count] = &$obj->$fn; //load the fieldnames into an object..
    $count++;
    }
    call_user_func_array(mysqli_stmt_bind_result, $fieldnames);
    mysqli_stmt_fetch($this->stmt);
    return     $obj;
    }

    function     fetch_array() {
    $data = mysqli_stmt_result_metadata($this->stmt);
    $count = 1; //start the count from 1. First value has to be a reference to the stmt. because bind_param requires the link to $stmt as the first param.
    $fieldnames[0] = &$this->stmt;
    while (    $field = mysqli_fetch_field($data)) {
    $fieldnames[$count] = &$array[$field->name]; //load the fieldnames into an array.
    $count++;
    }
    call_user_func_array(mysqli_stmt_bind_result, $fieldnames);
    mysqli_stmt_fetch($this->stmt);
    return     $array;

    }

    ?>

    Hope this helps some people, I was puzzled by this for a while.
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