Php multi-dimensional array de-duplication (de-duplication for any key value)-unique two-dimensional array-time complexity ~ On

: This article mainly introduces the de-duplication of php multi-dimensional arrays (de-duplication of any key value)-unique two-dimensional arrays-time complexity ~ On. For more information about PHP tutorials, see. Take a two-dimensional array as an example to deduplicate any key value. The time complexity is ~ O (n), only one foreach Loop:

 Array ('name' => 'James ', 'age' => 30,), '1' => array ('name' => 'susu ', 'age' => 26,), '2' => array ('name' => 'James ', 'age' => 30 ,), 'New' => array ('name' => 'kube ', 'age' => 37 ,), 'list' => array ('name' => 'kube ', 'age' => 27 ,),); /* Remove any key value */function getArrayUniqueByKeys ($ arr) {$ arr_out = array (); foreach ($ arr as $ k => $ v) {$ key_out = $ v ['name']. "-". $ v ['age']; // extract the key (name age) of the internal one-dimensional array as the key of the external array if (array_key_exists ($ key_out, $ arr_out) {continue ;} else {$ arr_out [$ key_out] = $ arr [$ k]; // use key_out as the key of the external array $ arr_wish [$ k] = $ arr [$ k]; // implement two-dimensional array uniqueness} return $ arr_wish;} $ arr_wish = getArrayUniqueByKeys ($ arr); printf ("As for the arbitrarily key:
"); Print_r ($ arr_wish); echo"
";?>

Output result:

As for the arbitrarily key:
Array ([0] => Array ([name] => james [age] => 30) [1] => Array ([name] => susu [age] => 26) [new] => Array ([name] => kube [age] => 37) [list] => Array ([name] => kube [age] => 27 ))

Development instance: coupon deduplication (repeated items cannot be removed in the discount amount-order amount Field)

Requirement: only one coupon with the same discount amount and order amount is displayed for the user to choose from, and the fastest expiration coupon is displayed:

 Array ('couponcode' => '000000', 'usablestarttime' => "3033323852301056", 'usableendtime' => "1439740800", 'couponamount '=> 1440798100, 'orderamount '=> 800,), '1' => array ('couponcode' => '000000', 'usablestarttime' => "3033323852301057 ", 'usableendtime' => "1440768100", 'uponamount' => 100, 'orderamount' => 800 ,), '2' => array ('couponcode' => '201312', 'usablestarttime' => "3033323852301058", 'US AbleEndTime '=> "1440788100", 'couponamount' => 100, 'orderamount '=> 800,), '3' => array ('couponcode' => '2016 ', 'usablestarttime' => "1439740800", 'usableendtime' => "1440779100", 'couponamount '=> 200, 'orderamount' => 800 ,), '4' => array ('couponcode' => '000000', 'usablestarttime' => "3033323852301060", 'usableendtime' => "1439740800 ", 'uponamount' => 200, 'orderamount' => 800,), '5' => Rray ('couponcode' => '000000', 'usablestarttime' => "3033323852301061", 'usableendtime' => "1439740800", 'couponamount '=> 1440798100, 'orderamount '=> 800,),); // print_r ($ arrCoupon); function getArrayUniqueByKey ($ arr) {$ arrWish = array (); $ today = time (); foreach ($ arr as $ k = >$ v) {if ($ v ['usablestarttime'] <= $ today) & ($ today <= $ v ['usableendtime']) {// Determine the available date of the coupon $ keyOut = $ v ['couponamount' ]. "-". $ V ['orderamount ']; // extract the key (couponAmount orderAmount) of the internal one-dimensional array as the key of the external array if (array_key_exists ($ keyOut, $ arrWish )) {// display the first expired coupon if (intval ($ arrWish [$ keyOut] ['usableendtime'])> intval ($ v ['usableendtime']) {$ arrWish [$ keyOut] = $ v; // if the end time in the original array is large, the value will be exchanged} continue;} $ arrWish [$ keyOut] = $ v; // implement two-dimensional array uniqueness} continue;} return $ arrWish;} $ arrWant = getArrayUniqueByKey ($ arrCoupon); print_r ($ arrW Ant);?>

Output result:

Array ([100-800] => Array ([couponCode] => 3033323852301057 [usableStartTime] => 1439740800 [usableEndTime] => 1440768100 [couponAmount] => 100 [orderAmount] => 800) [200-800] => Array ([couponCode] => 3033323852301060 [usableStartTime] => 1439740800 [usableEndTime] => 1440758100 [couponAmount] => 200 [orderAmount] => 800))

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