PHP-MYSQL Cannot delete on mysqli_multi_query - php

Question

I have two querys that have to delete rows on different tables when a checkbox is checked. The problem is that only executes one of the querys and ignores the other one.
Here's the code:
if(isset($_POST["che".$i.""])){
$query4 = "DELETE FROM gastos WHERE id_dedicaciondos = $idded AND id_usuario=$idu;";
$query4 .= "DELETE FROM dedicacio WHERE id_dedicacion = $idded AND id_usuario=$idu;" ;
if(mysqli_multi_query($connexio,$query4)){
do{
if ($result = mysqli_store_result($connexio)) {
mysqli_free_result($result);
}
}while(mysqli_next_result($connexio) && mysqli_more_results($connexio));
}
}
Only deletes the rows from the second query... If I change the order of the querys the result is exactly the same, only deletes from the query "delete from dedicacio".
What can I do?
Thanks in advance
UPDATE
I've tried the next:
if(isset($_POST["che".$i.""])){
$query4 = "DELETE FROM gastos WHERE id_dedicaciondos = ".$idded.";";
$query5 = "DELETE FROM dedicacio WHERE id_dedicacion = ".$idded.";";
if(mysqli_query($connexio,$query4)){
echo "YES!";
}
if(mysqli_query($connexio,$query5)){
echo "YES2!";
}
}
It shows "YES!" and "YES2!" But the query don't delete anything on the "gastos" table :(
UPDATE
I solved by myself adding a "ON DELETE CASCADE" to the id_dedicaciondos that references id_dedicacions.

Answer 1

TRy to use this code:
if ($mysqli->multi_query($query4)) {
do {
if ($result = $mysqli->store_result()) {
$result->free();
}
/* print divider */
if ($mysqli->more_results()) {
printf("-----------------\n");
}
} while ($mysqli->next_result());
}

Answer 2

Just tested this and it works fine:
<?php
$mysqli = new mysqli("localhost", "user", "pass", "testdb");
$query4 = "DELETE FROM test_table1 WHERE num = 0;";
$query4 .= "DELETE FROM test_table2 WHERE num = 0;";
$mysqli->multi_query($query4);
while ($mysqli->next_result()) {;} // flush queries
$mysqli->close();
?>