Jump to content

Merging Arrays?


Renegade605
 Share

Recommended Posts

So I have a PHP script which pulls data from 12 different MySQL tables, multiple rows can be selected from each table. Every table has a field called 'Date'.What I want to do is take all the arrays generated by mysql_fetch_assoc() and merge them into one. Example:$mysql_table1_data = array( ["Date"]=>"2008-05-15", Other Data...)$mysql_table2_data = array( ["Date"]=>"2008-06-15", Other Data...)BECOMES...

$mysql_merge_data = array (							[0]=>array( 							   ["Date"]=>"2008-05-15", 							   Other Data...							 ), 							[1]=>array( 							   ["Date"]=>"2008-06-15", 							   Other Data...							 ) 						  )

So before I go and write the very long and complicated code I have in mind; does anyone have a relatively easy way of doing this?Any thoughts appreciated.Renegade

Link to comment
Share on other sites

Why don't you use UNION?Edit: Oh, I suppose that wouldn't be possible if there were different values for each table...

Link to comment
Share on other sites

If you have a result set and you want all results in an array you can just push each result onto your array.

$ar = array();while ($row = mysql_fetch_assoc($result))  $ar[] = $row; // or array_push($ar, $row);

Is that what you were asking? You can change anything in the row before you add it to the array. I've got this loop that uses a database class, but it's pretty much the same thing, where it gets a result set and loops through it to change some of the values (e.g. active from 1/0 to yes/no) before adding the results to the $response array. The outer loop gets each category, and the inner loop gets each piece of content in the category and adds it to the 'children' array for the category before the whole category gets put on the $response array.

	$response = array();	$db->sql('SELECT id, title, active FROM content_categories ORDER BY disp_order, title');	$cats = $db->select();	foreach ($cats as $cat)	{	  $cat['active'] = $cat['active'] ? 'Yes' : 'No';	  $cur_cat = array(		'db_id' => $cat['id'],		'title' => $cat['title'],		'code' => '',		'type' => '',		'post_date' => '',		'active' => $cat['active'],		'uiProvider' => 'col',		'children' => array()	  );	  $db->sql('SELECT id, title, code, type, active, post_date FROM content WHERE category=%d ORDER BY disp_order, title');	  $db->add_param($cat['id'], false);	  $content = $db->select();	  foreach ($content as $c)	  {		$c['post_date'] = date($config['timestamp'], $c['post_date']);		$c['active'] = $c['active'] ? 'Yes' : 'No';		$c['type'] = $config['content_types'][$c['type']];		$cur_cat['children'][] = array(		  'db_id' => $c['id'],		  'title' => $c['title'],		  'code' => $c['code'],		  'type' => $c['type'],		  'post_date' => $c['post_date'],		  'active' => $c['active'],		  'uiProvider' => 'col',		  'leaf' => true		);	  }	  $response[] = $cur_cat;	}

Link to comment
Share on other sites

no that wouldn't work because I'm getting data from multiple queries (to multiple tables), not just oneAn expanded example:

$mysql_table1_data = array( [0]=>array( ['Date']=>"2008-08-10", Other Data... ), [1]=>array( ['Date']=>"2008-08-22", Other Data... ) )$mysql_table2_data = array( [0]=>array( ['Date']=>"2008-08-15", Other Data... ) )$mysql_table3_data = array( [0]=>array( ['Date']=>"2008-07-29", Other Data... ), [1]=>array( ['Date']=>"2008-08-11", Other Data... ), [2]=>array( ['Date']=>"2008-08-25" Other Data... ) )/* CODE TO MERGE THE ARRAYS */$mysql_merge_data = array(---------------------------------------[0]=>array( ['Date']=>"2008-07-29", Other Data... ),---------------------------------------[1]=>array( ['Date']=>"2008-08-10", Other Data... ),---------------------------------------[2]=>array( ['Date']=>"2008-08-11", Other Data... ),---------------------------------------[3]=>array( ['Date']=>"2008-08-15", Other Data... ),---------------------------------------[4]=>array( ['Date']=>"2008-08-22", Other Data... ),---------------------------------------[5]=>array( ['Date']=>"2008-08-25", Other Data... )------------------------------------)
Edited by Renegade605
Link to comment
Share on other sites

but doesn't the array_merge() function overwrite array elements with the same index? which would result in (in the example above) the merged array being exactly the same as the $mysql_table3_data array. correct me if I'm wrong but I don't think that will work.

Link to comment
Share on other sites

but doesn't the array_merge() function overwrite array elements with the same index? which would result in (in the example above) the merged array being exactly the same as the $mysql_table3_data array. correct me if I'm wrong but I don't think that will work.
From array_merge()'s documentation:
If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended.
And since all of your 'Date' keys are inside numeric arrays, array_merge() is exactly what you need.
Link to comment
Share on other sites

Oops, I didn't realize that. array_merge() didn't sort my array though, is there and easy function for this? Or am I right back where I started?

$mysql_table1_data = array(array("Date"=>"2008-08-10","Data"=>"a"),array("Date"=>"2008-08-22","Data"=>"b"));$mysql_table2_data = array(array("Date"=>"2008-08-15","Data"=>"c"));$mysql_table3_data = array(array("Date"=>"2008-07-29","Data"=>"d"),array("Date"=>"2008-08-11","Data"=>"e"),array("Date"=>"2008-08-25","Data"=>"f"));print_r(array_merge($mysql_table1_data,$mysql_table2_data,$mysql_table3_data));

Array ( [0] => Array ( [Date] => 2008-08-10 [Data] => a ) [1] => Array ( [Date] => 2008-08-22 [Data] => b ) [2] => Array ( [Date] => 2008-08-15 [Data] => c ) [3] => Array ( [Date] => 2008-07-29 [Data] => d ) [4] => Array ( [Date] => 2008-08-11 [Data] => e ) [5] => Array ( [Date] => 2008-08-25 [Data] => f ) )
Link to comment
Share on other sites

Did you tried to use usort() as already suggested by justsomeguy?You'll need to write your own custom callback function that will know how to sort the values. Read the documentation for details.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...