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PDOStatement->fetchAll()
Returns an array containing all of the result set rows
()
Parameters
- fetch_style
Controls the contents of the returned array as documented in PDOStatement->fetch(). Defaults to
PDO::FETCH_BOTH.To return an array consisting of all values of a single column from the result set, specify
PDO::FETCH_COLUMN. You can specify which column you want with the column-index parameter.To fetch only the unique values of a single column from the result set, bitwise-OR
PDO::FETCH_COLUMNwithPDO::FETCH_UNIQUE.To return an associative array grouped by the values of a specified column, bitwise-OR
PDO::FETCH_COLUMNwithPDO::FETCH_GROUP.- column_index
Returns the indicated 0-indexed column when the value of fetch_style is
PDO::FETCH_COLUMN. Defaults to0.- ctor_args
Arguments of custom class constructor.
Return Values
PDOStatement->fetchAll() returns an array containing all of the remaining rows in the result set. The array represents each row as either an array of column values or an object with properties corresponding to each column name.
Using this method to fetch large result sets will result in a heavy demand on system and possibly network resources. Rather than retrieving all of the data and manipulating it in PHP, consider using the database server to manipulate the result sets. For example, use the WHERE and SORT BY clauses in SQL to restrict results before retrieving and processing them with PHP.
Examples
Example 1786. Fetch all remaining rows in a result set
<?php
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();
/* Fetch all of the remaining rows in the result set */
print("Fetch all of the remaining rows in the result set:\n");
$result = $sth->fetchAll();
print_r($result);
?>The above example will output:
Fetch all of the remaining rows in the result set:
Array
(
[0] => Array
(
[NAME] => pear
[0] => pear
[COLOUR] => green
[1] => green
)
[1] => Array
(
[NAME] => watermelon
[0] => watermelon
[COLOUR] => pink
[1] => pink
)
)
Example 1787. Fetching all values of a single column from a result set
The following example demonstrates how to return all of the values of a single column from a result set, even though the SQL statement itself may return multiple columns per row.
<?php
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();
/* Fetch all of the values of the first column */
$result = $sth->fetchAll(PDO::FETCH_COLUMN, 0);
var_dump($result);
?>The above example will output:
Array(3)
(
[0] =>
string(5) => apple
[1] =>
string(4) => pear
[2] =>
string(10) => watermelon
)
Example 1788. Grouping all values by a single column
The following example demonstrates how to return an associative array
grouped by the values of the specified column in the result set. The
array contains three keys: values apple and
pear are returned as arrays that contain two
different colours, while watermelon is
returned as an array that contains only one colour.
<?php
$insert = $dbh->prepare("INSERT INTO fruit(name, colour) VALUES (?, ?)");
$insert->execute('apple', 'green');
$insert->execute('pear', 'yellow');
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();
/* Group values by the first column */
var_dump($sth->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP));
?>The above example will output:
array(3) {
["apple"]=>
array(2) {
[0]=>
string(5) "green"
[1]=>
string(3) "red"
}
["pear"]=>
array(2) {
[0]=>
string(5) "green"
[1]=>
string(6) "yellow"
}
["watermelon"]=>
array(1) {
[0]=>
string(5) "green"
}
}