Php/docs/mysqli-result.fetch-assoc
mysqli_result::fetch_assoc
mysqli_fetch_assoc
(PHP 5, PHP 7)
mysqli_result::fetch_assoc -- mysqli_fetch_assoc — Fetch a result row as an associative array
说明
面向对象风格
public mysqli_result::fetch_assoc ( ) : array
过程化风格
mysqli_fetch_assoc
( mysqli_result $result
) : array
Returns an associative array that corresponds to the fetched row or null
if there are no more rows.
Note: 此函数返回的字段名大小写敏感。
Note: 此函数将 NULL 字段设置为 PHP
null值。
返回值
Returns an associative array of strings representing the fetched row in the result
set, where each key in the array represents the name of one of the result
set's columns or null if there are no more rows in resultset.
If two or more columns of the result have the same field names, the last column will take precedence. To access the other column(s) of the same name, you either need to access the result with numeric indices by using mysqli_fetch_row() or add alias names.
范例
Example #1 面向对象风格
<?php$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 DESC LIMIT 50,5";if ($result = $mysqli->query($query)) { /* fetch associative array */ while ($row = $result->fetch_assoc()) { printf ("%s (%s)\n", $row["Name"], $row["CountryCode"]); } /* free result set */ $result->free();}/* close connection */$mysqli->close();?>
Example #2 过程化风格
<?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 DESC LIMIT 50,5";if ($result = mysqli_query($link, $query)) { /* fetch associative array */ while ($row = mysqli_fetch_assoc($result)) { printf ("%s (%s)\n", $row["Name"], $row["CountryCode"]); } /* free result set */ mysqli_free_result($result);}/* close connection */mysqli_close($link);?>
以上例程会输出：
Pueblo (USA) Arvada (USA) Cape Coral (USA) Green Bay (USA) Santa Clara (USA)
Example #3 A mysqli_result example comparing iterator usage
<?php$c = mysqli_connect('127.0.0.1','user', 'pass');// Using iterators (support was added with PHP 5.4)foreach ( $c->query('SELECT user,host FROM mysql.user') as $row ) { printf("'%s'@'%s'\n", $row['user'], $row['host']);}echo "\n==================\n";// Not using iterators$result = $c->query('SELECT user,host FROM mysql.user');while ($row = $result->fetch_assoc()) { printf("'%s'@'%s'\n", $row['user'], $row['host']);}?>
以上例程的输出类似于：
'root'@'192.168.1.1' 'root'@'127.0.0.1' 'dude'@'localhost' 'lebowski'@'localhost' ================== 'root'@'192.168.1.1' 'root'@'127.0.0.1' 'dude'@'localhost' 'lebowski'@'localhost'
参见
- mysqli_fetch_array() - Fetch a result row as an associative, a numeric array, or both
- 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() - 对数据库执行一次查询
- mysqli_data_seek() - Adjusts the result pointer to an arbitrary row in the result
