"need php pdo implode arrays and insert multiple rows in mysql" Code Answer

3
foreach ($_post['date_day'] as $i => $date_day) {
    $insertquery[] = '(?, ?)';
    $insertdata[] = $_post['amount'][$i];
    $insertdata[] = $date_day;
}

does it simply define/set that $insertquery and $insertdata both are arrays?

yes.

and [] is a shorthand for array() since php 5.4, so you can make it

$insertquery = [];
$insertdata = [];

or

$insertquery = array();
$insertdata = [];

or

$insertquery = $insertdata = [];
By MichaelRushton on April 5 2022

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