php - How to checks if the given key or index exists in the array? -

i have created array of data mysql database. how array looks like:

// fetch records: while ($stmt->fetch()) {      $output  =  "<a>\n";     $output .=      "<h3>{$product_name}</h3>\n";     $output .=      "<span class='price'><span class='amount'>bd.{$price}</span></span>\n";     $output .=  "</a>\n";     $output .=  "<div class='short_desc'>\n";     $output .=          "$product_des\n";            $output .=  "</div>\n";      //add output array     $products[] = $output;       } 

since want use array values outside while loop , how use $products[] array in page.

echo $products[0]; echo $products[1]; echo $products[2]; echo $products[3]; 

my question if $products[] array have 1 result set can error.

my error message this: error occurred in script 'c:\wamp\www\computer\index.php' on line 208: undefined offset: 2

so tried fix problem using array_key_exists() function way each echo:

if(!empty($products) && array_key_exists("$products[1]", $products)) echo $products[1]; else echo "no product"; 

but still can error. can tell me wrong this?

thank you.

you want like:

if( ! empty($products) ) {     $ids = array(0, 1, 2, 3, 4, 5);     foreach ( $ids $id ) {        if ( ! empty($products[$id]) ) echo $products[$id];     } } else {     echo "no product"; }