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An array (in PHP) is actually an ordered map. A map is a type that associates values to keys. This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more. As array values can be other arrays, trees and multidimensional arrays are also possible.

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Since you have plugin options in array ( with keys ), lets assume your scenario like this: Your old option is $old = get_option( 'plugin_options' );contain this: $old = array( 'plugin_option_1 … ' => '1', 'plugin_option_2' => '2', 'plugin_option_3' => '3', 'plugin_option_4' => '4', 'plugin_option_5' => '5' ); Your new option is $new contain this array for updated: $new …
answered Mar 26 '16 by Jevuska