SunshinePHP Developer Conference 2015

mysqli_result::fetch_array

mysqli_fetch_array

(PHP 5)

mysqli_result::fetch_array -- mysqli_fetch_arrayFetch a result row as an associative, a numeric array, or both

Beschreibung

Objektorientierter Stil

mixed mysqli_result::fetch_array ([ int $resulttype = MYSQLI_BOTH ] )

Prozeduraler Stil

mixed mysqli_fetch_array ( mysqli_result $result [, int $resulttype = MYSQLI_BOTH ] )

Returns an array that corresponds to the fetched row or NULL if there are no more rows for the resultset represented by the result parameter.

mysqli_fetch_array() is an extended version of the mysqli_fetch_row() function. In addition to storing the data in the numeric indices of the result array, the mysqli_fetch_array() function can also store the data in associative indices, using the field names of the result set as keys.

Hinweis: Feldnamen, die von dieser Funktion zurückgegeben werden, unterscheiden sich in der Groß-/Kleinschreibung.

Hinweis: Diese Funktion setzt NULL-Felder auf den PHP Wert-NULL.

If two or more columns of the result have the same field names, the last column will take precedence and overwrite the earlier data. In order to access multiple columns with the same name, the numerically indexed version of the row must be used.

Parameter-Liste

result

Nur bei prozeduralem Aufruf: Ein von mysqli_query(), mysqli_store_result() oder mysqli_use_result() zurückgegebenes Ergebnisobjekt.

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.

By using the MYSQLI_ASSOC constant this function will behave identically to the mysqli_fetch_assoc(), while MYSQLI_NUM will behave identically to the mysqli_fetch_row() function. The final option MYSQLI_BOTH will create a single array with the attributes of both.

Rückgabewerte

Returns an array of strings that corresponds to the fetched row or NULL if there are no more rows in resultset.

Beispiele

Beispiel #1 Objektorientierter Stil

<?php
$mysqli 
= new mysqli("localhost""my_user""my_password""world");

/* check connection */
if ($mysqli->connect_errno) {
    die(
"Connect failed: %s\n"$mysqli->connect_error);
}

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

/* numeric array */
$row $result->fetch_array(MYSQLI_NUM);
printf ("%s (%s)\n"$row[0], $row[1]);

/* associative array */
$row $result->fetch_array(MYSQLI_ASSOC);
printf ("%s (%s)\n"$row["Name"], $row["CountryCode"]);

/* associative and numeric array */
$row $result->fetch_array(MYSQLI_BOTH);
printf ("%s (%s)\n"$row[0], $row["CountryCode"]);

/* free result set */
$result->free();

/* close connection */
$mysqli->close();
?>

Beispiel #2 Prozeduraler Stil

<?php
$link 
mysqli_connect("localhost""my_user""my_password""world");

/* check connection */
if (mysqli_connect_errno()) {
    
printf("Connect failed: %s\n"mysqli_connect_error());
    exit();
}

$query "SELECT Name, CountryCode FROM City ORDER by ID LIMIT 3";
$result mysqli_query($link$query);

/* numeric array */
$row mysqli_fetch_array($resultMYSQLI_NUM);
printf ("%s (%s)\n"$row[0], $row[1]);

/* associative array */
$row mysqli_fetch_array($resultMYSQLI_ASSOC);
printf ("%s (%s)\n"$row["Name"], $row["CountryCode"]);

/* associative and numeric array */
$row mysqli_fetch_array($resultMYSQLI_BOTH);
printf ("%s (%s)\n"$row[0], $row["CountryCode"]);

/* free result set */
mysqli_free_result($result);

/* close connection */
mysqli_close($link);
?>

Die obigen Bespiele erzeugen folgende Ausgabe:

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

Siehe auch

add a note add a note

User Contributed Notes 3 notes

up
23
Jammerx2
4 years ago
Putting multiple rows into an array:

<?php
$mysqli
= new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
   
printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

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

while(
$row = $result->fetch_array())
{
$rows[] = $row;
}

foreach(
$rows as $row)
{
echo
$row['CountryCode'];
}

/* free result set */
$result->close();

/* close connection */
$mysqli->close();
?>
up
2
ahouston at gmail dot com
3 years ago
Here is a function to return an associative array with multiple columns as keys to the array.

This is a rough approximation of the perl DBI->fetchall_hashref function - something I find myself using quite a bit.

Given a simple mySQL table:

mysql> select * from city;
+----------------+----------------+------------------+------------+
| country        | region         | city             | hemisphere |
+----------------+----------------+------------------+------------+
| South Africa   | KwaZulu-Natal  | Durban           | South      |
| South Africa   | Gauteng        | Johannesburg     | South      |
| South Africa   | Gauteng        | Tshwane          | South      |
| South Africa   | KwaZulu-Natal  | Pietermaritzburg | South      |
| United Kingdom | Greater London | City of London   | North      |
| United Kingdom | Greater London | Wimbledon        | North      |
| United Kingdom | Lancashire     | Liverpool        | North      |
| United Kingdom | Lancashire     | Manchester       | North      |
+----------------+----------------+------------------+------------+

*Note* - this is a simple function that makes no attempt to keep multiple values per key, so you need to specify all the unique keys you require.

<?php

        $link
= mysqli_connect("localhost", "username", "password", "test");
       
$result = mysqli_query($link, "select * from city");
       
$results_arr = fetch_all_assoc($result,array('hemisphere','country','region','city'));

function
fetch_all_assoc(& $result,$index_keys) {

 
// Args :    $result = mysqli result variable (passed as reference to allow a free() at the end
  //           $indexkeys = array of columns to index on
  // Returns : associative array indexed by the keys array

 
$assoc = array();             // The array we're going to be returning

 
while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC)) {

       
$pointer = & $assoc;            // Start the pointer off at the base of the array

       
for ($i=0; $i<count($index_keys); $i++) {
       
               
$key_name = $index_keys[$i];
                if (!isset(
$row[$key_name])) {
                        print
"Error: Key $key_name is not present in the results output.\n";
                        return(
false);
                }

               
$key_val= isset($row[$key_name]) ? $row[$key_name]  : "";
       
                if (!isset(
$pointer[$key_val])) {              

                       
$pointer[$key_val] = "";                // Start a new node
                       
$pointer = & $pointer[$key_val];                // Move the pointer on to the new node
               
}
                else {
                       
$pointer = & $pointer[$key_val];            // Already exists, move the pointer on to the new node
               
}

        }
// for $i

        // At this point, $pointer should be at the furthest point on the tree of keys
        // Now we can go through all the columns and place their values on the tree
        // For ease of use, include the index keys and their values at this point too

       
foreach ($row as $key => $val) {
                       
$pointer[$key] = $val;
        }

  }
// $row

  /* free result set */
 
$result->close();

  return(
$assoc);              
}

?>
up
0
Duncan
1 year ago
Note that the array returned contains only strings.

E.g. when a MySQL field is an INT you may expect the field to be returned as an integer, however all fields are simply returned as strings.

What this means: use double-equals not triple equals when comparing numbers.

<?php
print $array_from_mysqli_fetch_array['id'] == 1 ? "true" : "false"; // true
print $array_from_mysqli_fetch_array['id'] === 1 ? "true" : "false"; // false
?>
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