Date: 07/12/06 (PHP Community)    Keywords: php, database

PHP -

I've got this function. I know there's a better way to get the keys and values of arrays, but I can't think of it. Do you have any ideas?

EDIT >>>

Basically, the function takes two arrays in, and looks for keys in array2 (minus a frm_ prepending for form submission) that match keys in array1. I take the key from array1 and put the value of array2 in the output array.

array2 is the $_SESSION array. array1 is an array of values from a database entry. Fields from a form are saved in the $_SESSION array so I can fill them in if there was an error on insertion.

<<<

function joinData($array1, $array2) {
	$len1 = count($array1); //length of array 1 - speeds up loops
	$len2 = count($array2); //length of array 2

	$keys1 = array_keys($array1); //keys of array1
	$vals1 = array_values($array1); //values of array 1

	$keys2 = array_keys($array2); //keys of array2
	$vals2 = array_values($array2); //values of array 2

	$output = array(); //what we send out

	for($i=0;$i<$len1;$i++) { //foreach element in array 1
		for($j=0;$j<$len2;$j++) { //search each element in array 2
			if( ($keys1[$i] == ereg_replace("frm_","",$keys2[$j])) ) { //until we find a key that matches after stripping frm_
				$output[$keys1[$i]] = $vals2[$j]; // overwrite the value in array1; array2 takes precidence
				break; // go to next element in array 1 - speeds up process (function is O(n log n), instead of O(n^2))
			}
		}
	}

	return $output; //send back the new values
}

Source: http://community.livejournal.com/php/469583.html