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Last updated: Thu, 19 May 2005

mysql_fetch_assoc

(PHP 4 >= 4.0.3, PHP 5)

mysql_fetch_assoc -- Fetch a result row as an associative array

Description

array mysql_fetch_assoc ( resource result )

Returns an associative array that corresponds to the fetched row. mysql_fetch_assoc() is equivalent to calling mysql_fetch_array() with MYSQL_ASSOC for the optional second parameter. It only returns an associative array.

Parameters

result

The result resource that is being evaluated. This result comes from a call to mysql_query().

Return Values

Returns an associative array that corresponds to the fetched row, or FALSE if there are no more rows.

If two or more columns of the result have the same field names, the last column will take precedence. To access the other column(s) of the same name, you either need to access the result with numeric indices by using mysql_fetch_row() or add alias names. See the example at the mysql_fetch_array() description about aliases.

Examples

Example 1. An expanded mysql_fetch_assoc() example

<?php

$conn = mysql_connect("localhost", "mysql_user", "mysql_password");

if (!$conn) {
   echo "Unable to connect to DB: " . mysql_error();
   exit;
}
 
if (!mysql_select_db("mydbname")) {
   echo "Unable to select mydbname: " . mysql_error();
   exit;
}

$sql = "SELECT id as userid, fullname, userstatus
       FROM  sometable
       WHERE  userstatus = 1";

$result = mysql_query($sql);

if (!$result) {
   echo "Could not successfully run query ($sql) from DB: " . mysql_error();
   exit;
}

if (mysql_num_rows($result) == 0) {
   echo "No rows found, nothing to print so am exiting";
   exit;
}

// While a row of data exists, put that row in $row as an associative array
// Note: If you're expecting just one row, no need to use a loop
// Note: If you put extract($row); inside the following loop, you'll
//      then create $userid, $fullname, and $userstatus
while ($row = mysql_fetch_assoc($result)) {
   echo $row["userid"];
   echo $row["fullname"];
   echo $row["userstatus"];
}

mysql_free_result($result);

?>

Notes

Performance: An important thing to note is that using mysql_fetch_assoc() is not significantly slower than using mysql_fetch_row(), while it provides a significant added value.

Note: Field names returned by this function are case-sensitive.

Note: This function sets NULL fields to PHP NULL value.

See Also

mysql_fetch_row()
mysql_fetch_array()
mysql_data_seek()
mysql_query()
mysql_error()



User Contributed Notes
mysql_fetch_assoc
erik[at]phpcastle.com
14-May-2005 02:50
When you have to loop multiple times through the result of a query you can set the result pointer to 0 (zero) with mysql_data_seek ()

The advantage is that you do not have to query database twice with te same query :)

So:
<?php
  $query = "
   SELECT *
   FROM database
  ";

  //Query database
  $result = mysql_query ($query);

  //Iterate result
  while ($record = mysql_fetch_assoc ($result)){
   print_r ($record);
  }

  ...

  //Point to 0 (zero)
  mysql_data_seek ($result, 0);

  //Re-use the result
  while ($record = mysql_fetch_assoc ($result)){
   print_r ($record);
  }
?>
joe at kybert dot com
29-Sep-2004 03:07
Worth pointing out that the internal row pointer is incremented once the data is collected for the current row.

This means that multiple calls will iterate through the row data, so you DONT need to mysql_data_seek(..) between calls.

This is noted in the  mysql_fetch_row() docs, but not here!?
moverton at northshropshiredc dot gov dot uk
17-Sep-2004 07:27
Actually, Olivier, you're completely wrong about that, because there's a bug in your sample code. It will indeed return $row['MAX(time)'] - you have to pass the MySQL resource to mysql_fetch_assoc() and you're not doing that. This:

$row = mysql_fetch_assoc($conn)

...where $conn is your DB connection, would in fact produce a result. The complete example below is taken from my own self-written content management system:

$query = 'SELECT MAX(ctRevDate) FROM content group by ctPage';
$querySet = mysql_query($query, $conn);
$row = mysql_fetch_assoc($querySet);
print_r($row);

This produces:

Array
(
   [MAX(ctRevDate)] => 2004-01-15
)

..on my testbed. So it doesn't in fact need an alias at all.
Olivier Fabre
07-Aug-2004 07:07
If your query is something like:

SELECT MAX(time) FROM table GROUP BY id

then $row = mysql_fetch_assoc() won't create $row['time'], nor $row['MAX(time)'].

Like for multi tables queries, the solution is to use an alias in the query:

SELECT MAX(time) as time FROM table GROUP BY id
marREtijn dot posthMOuma at hoVEme dot nl
04-Sep-2003 06:57
It appears that you can't have table.field names in the resulting array.
Just use an alias if your results come up empty and you are using multi-table query's:

$res=mysql_query("SELECT user.ID AS uID, order.ID AS oID FROM user, order WHERE ( order.userid=uID )";
while ($row=mysql_fetch_assoc($res)) {
   echo "<p>userid: $row['uID'], orderid: $row['oID']</p>";
}

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 Last updated: Thu, 19 May 2005
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Last updated: Thu May 19 17:35:34 2005 CDT