djkilgus

kicken, Thank you for the constructive reply. Thanks to you I figured it out. For anyone who is interested here is the correct (single) sort function: function sortByDateThenByPrice($x, $y) { if ( $x[1] == $y[1] ) if ( $x[2] == $y[2] ) return 0; else if ( $x[2] < $y[2] ) return -1; else return 1; else if ( $x[1] < $y[1] ) return -1; else return 1; } usort($productArray, 'sortByDateThenByPrice');

PFMaBiSmAd, thanks for the response. The individual sort functions are working fine. If I comment out usort($productArray, 'sortElement1Asc'); and run the code it sorts by price ascending and vice versa with the other usort line. I just can't get a sort by date, sort by price to work.

I have a multidimensional array that I want to sort by "price" then by "date". Here is an example of the array: $productArray = array ( array ("Bus", "1/1/2010", 15.99), array ("Train", "2/1/2010", 14.99), array ("Car", "3/1/2010", 18.00), array ("Plane", "3/1/2010", 15.99), array ("Bike", "3/1/2010", 9.99), array ("Truck", "1/1/2010", 19.99) ); //sort by date function sortElement1Asc($x, $y) { if ( $x[1] == $y[1] ) return 0; else if ( $x[1] < $y[1] ) return -1; else return 1; } //sort by price function sortElement2Asc($x, $y) { if ( strtotime($x[2]) == strtotime($y[2]) ) return 0; else if ( strtotime($x[2]) < strtotime($y[2]) ) return -1; else return 1; } usort($productArray, 'sortElement1Asc'); usort($productArray, 'sortElement2Asc'); Unfortunately this is just sorting by price (or whatever i sort last). Any ideas?