Simple example of php array deduplication (one-dimensional and two-dimensional array deduplication)-php Tutorial

Simple example of php array deduplication (one-dimensional and two-dimensional array deduplication)

$ Aa = array ("apple", "banana", "pear", "apple", "wail", "watermalon "); $ Bb = array_unique ($ aa ); Print_r ($ bb ); ?> Output result: Array ([0] => apple [1] => banana [2] => pear [4] => wail [5] => watermalon ). 2. duplicate items of two-dimensional PHP arrays: We will discuss two types of two-dimensional arrays. one is because the values of one-click names cannot be repeated and repeated items are deleted; in addition, duplicate items are deleted because the internal one-dimensional arrays cannot be identical. Example 1: delete duplicate items because the values of one-click names cannot be repeated. Code: Function assoc_unique ($ arr, $ key) { $ Tmp_arr = array (); Foreach ($ arr as $ k => $ v) { If (in_array ($ v [$ key], $ tmp_arr) // search for $ v [$ key] in the $ tmp_arr array. if yes, true is returned. // Bbs.it-home.org Unset ($ arr [$ k]); } Else { $ Tmp_arr [] = $ v [$ key]; } } Sort ($ arr); // sort the array Return $ arr; } $ Aa = array ( Array ('id' => 123, 'name' => 'Zhang San '), Array ('id' => 123, 'name' => 'Lily '), Array ('id' => 124, 'name' => 'Wang Wu '), Array ('id' => 125, 'name' => 'Zhao Liu '), Array ('id' => 126, 'name' => 'Zhao Liu ') ); $ Key = 'id '; Assoc_unique (& $ aa, $ key ); Print_r ($ aa ); ?> Output result: Array ([0] => Array ([id] => 123 [name] => Zhang San) [1] => Array ([id] => 124 [name] => Wang Wu) [2] => Array ([id] => 125 [name] => Zhao 6) [3] => Array ([id] => 126 [name] => Zhao 6) Example 2: duplicate items are deleted because the internal one-dimensional arrays cannot be identical. Code: Function array_unique_fb ($ array2D ){ Foreach ($ array2D as $ v ){ $ V = join (",", $ v); // dimension reduction. you can also use implode to convert a one-dimensional array to a string connected with commas (,). $ Temp [] = $ v; } // Bbs.it-home.org $ Temp = array_unique ($ temp); // remove the duplicate string, that is, the duplicate one-dimensional array. Foreach ($ temp as $ k => $ v ){ $ Temp [$ k] = explode (",", $ v); // re-assemble the split array } Return $ temp; } $ Aa = array ( Array ('id' => 123, 'name' => 'Zhang San '), Array ('id' => 123, 'name' => 'Lily '), Array ('id' => 124, 'name' => 'Wang Wu '), Array ('id' => 123, 'name' => 'Lily '), Array ('id' => 126, 'name' => 'Zhao Liu ') ); $ Bb = array_unique_fb ($ aa ); Print_r ($ bb) ?> Output result: Array ([0] => Array ([0] => 123 [1] => Zhang San) [1] => Array ([0] => 123 [1] => Li Si) [2] => Array ([0] => 124 [1] => Wang Wu) [4] => Array ([0] => 126 [1] => Zhao 6 ))