mysqli_result::fetch_array

mysqli_fetch_array

(PHP 5, PHP 7)

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

설명

객체 기반 형식

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

절차식 형식

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.

Note: 이 함수가 반환하는 필드 이름은 대소문자를 구별합니다.

Note: 이 함수는 NULL 필드를 PHP NULL 값으로 설정합니다.

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.

인수

result

순차 형식 전용: mysqli_query()mysqli_store_result()mysqli_use_result()가 반환한 결과셋 식별자.

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.

반환값

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

예제

Example #1 객체 기반 형식

<?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);

/* 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();
?>

Example #2 절차식 형식

<?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);
?>

위 예제들의 출력:

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

참고

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User Contributed Notes 4 notes

up
70
Jammerx2
10 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
6
meaje at msn dot com
2 years ago
Please note that under PHP 5.x there appears to be a globally defined variable MYSQL_ASSOC, MYSQL_NUM, or MYSQL_BOTH which is the equivalent of MYSQLI_ASSOC, MYSQLI_NUM, or MYSQLI_BOTH!!! Yet under PHP 7.x this is NOT the case and will cause a failure in trying to retrieve the result set!

This can cause severe headaches when trying to find out why you are getting the error:
- mysqli_result::fetch_array() expects parameter 1 to be integer, string given in 'Filename' on line 'XX'
up
5
Duncan
7 years 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
?>
up
-33
ahouston at gmail dot com
9 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);              
}

?>
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