PHP: accessing mysqli result by record id - php

Question

i'm having an array which contains record ids as follows:
Array
(
[0] => 113
[1] => 43
[2] => 64
)
so for achieving the corresponding records, i'd have to run 3 queries:
select * from mytable where id=113
select * from mytable where id=43
select * from mytable where id=64
my question: wouldn't it be possible executing just ONE query on the whole table then directly access the mysqli result like an associative array by passing the ID?
something like $record = $res['id'][113];?
thanks in advance

Answer 1

You need the IN clause
SELECT * FROM mytable WHERE id IN ( 113,43,64 );

Answer 2

Custom function indexme takes an array of arrays (numeric or associative) and by default gets the first element value of each sub-array and makes it the associative index in a return array. Optionally, a column name can be passed as the second parameter to designate which column value to use for the index.
$array = array(array('id' => 12, 'name' => 'Joe'), array('id' => 9, 'name' => 'Jane'));
$array_keyed = indexme($array);
// > array(12 => array('id' => 12, 'name' => 'Joe'), 9 => array('id' => 9, 'name' => 'Jane'));
print $array_keyed[12]['name'];
// > Joe
function indexme($arr, $key = '') { // <- custom function indexme
$return_arr = array();
if ( '' == $key ) {
$keys = array_keys($arr[0]);
$key = $keys[0];
}
foreach ( $arr as $value ) {
$return_arr[$value[$key]] = $value;
}
return $return_arr;
}
Pass the mysqli response to this function to make an ID indexed array:
$results_keyed = indexme($result->fetch_assoc(), 'id');
Check out the accepted answer on this page MySQL Prepared statements with a variable size variable list for a nice solution to the WHERE IN technique.