Retrieve database information and check results for certain conditions - php

Question

I am looking for the most efficient method to do the following...
I have a table with three fields: id, eventid and movetype - and I have the following code to query the database for all entries with a matching eventid :
$get_results = mysql_query("SELECT * FROM table WHERE eventid='$eventid'");
while($row = mysql_fetch_array($get_results)){
// store results in array
$move_type_array = explode(" ", $row['movetype']);
}
Please note: movetype can only be three values: Internal, Outgoing, Incoming
Using a set of dummy data, var_dump($move_type_array) could output:
array(1) { [0]=> string(8) "Internal" } array(1) { [0]=> string(8) "Internal" }
Another example of an output would be:
array(1) { [0]=> string(8) "Internal" } array(1) { [0]=> string(8) "Incoming" } array(1) { [0]=> string(8) "Outgoing" }
I then need to check the output to see if the following conditions are met:
Does the array contain Internal twice?
If the array only contains Internal once, then does the array also contain Incoming and Outgoing?
If either of the conditions are met then a message should be displayed telling them which condition has been met, otherwise a message should tell them that the conditions have not been met.
I have tried using a number of PHP functions such as in_array(), and also tried storing the data in a string and using preg_match() however I was unsuccessful in both methods.

Answer 1

Try this:
$result = mysql_query("
SELECT SUM(IF(movetype = 'Internal', 1, 0)) AS internal,
SUM(IF(movetype = 'Outgoing', 1, 0)) AS outgoing,
SUM(IF(movetype = 'Incoming', 1, 0)) AS incoming
FROM table
WHERE eventid = $eventid
GROUP BY eventid
");
$count = mysql_fetch_array($result);
if ($count['internal'] >= 2 || ($count['internal'] == 1
&& $count['outgoing'] >= 1
&& $count['incoming'] >= 1)) {
echo 'Yes';
} else {
echo 'No';
}

Answer 2

// 1. Don't use '*' - fetch only required fields!
// 2. Don't use mysql_* functions - they are obsolete! Use PDO or MySQLi instead.
$get_results = mysql_query("SELECT `movetype` FROM table WHERE eventid='$eventid'");
while($row = mysql_fetch_array($get_results)){
// Count the values
$arr = array_count_values(explode(" ", $row['movetype']));
// Check them here
if(isset($arr['Internal'])) {
if($arr['Internal'] === 2)
echo ' Internal: 2'.PHP_EOL;
else if($arr['Internal'] === 1
&& isset($arr['Incoming'])
&& isset($arr['Outgoing']))
echo ' Internal: 1, Incoming and Outgoing'.PHP_EOL;
}
}