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();
?>
mysqli_result::fetch_array
mysqli_fetch_array
(PHP 5, PHP 7)
mysqli_result::fetch_array -- mysqli_fetch_array — Fetch a result row as an associative, a numeric array, or both
설명
객체 기반 형식
절차식 형식
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
NULL값으로 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()나 mysqli_store_result()나 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, orMYSQLI_BOTH.By using the
MYSQLI_ASSOCconstant this function will behave identically to the mysqli_fetch_assoc(), whileMYSQLI_NUMwill behave identically to the mysqli_fetch_row() function. The final optionMYSQLI_BOTHwill 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 */
$row = mysqli_fetch_array($result, MYSQLI_NUM);
printf ("%s (%s)\n", $row[0], $row[1]);
/* associative array */
$row = mysqli_fetch_array($result, MYSQLI_ASSOC);
printf ("%s (%s)\n", $row["Name"], $row["CountryCode"]);
/* associative and numeric array */
$row = mysqli_fetch_array($result, MYSQLI_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
- mysqli_fetch_assoc() - Fetch a result row as an associative array
- mysqli_fetch_row() - Get a result row as an enumerated array
- mysqli_fetch_object() - Returns the current row of a result set as an object
- mysqli_query() - Performs a query on the database
- mysqli_data_seek() - Adjusts the result pointer to an arbitrary row in the result
add a note
User Contributed Notes 4 notes
Jammerx2 ¶
14 years ago
Duncan ¶
11 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
?>
meaje at msn dot com ¶
6 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'
ahouston at gmail dot com ¶
13 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);
}
?>
