Simple example of php array de-weight (one-dimensional, two-dimensional array de-weight)

$aa =array ("Apple", "banana", "pear", "apple", "wail", "Watermalon"); $BB =array_unique ($AA); Print_r ($BB); ?> Copy Code Output: Array ([0] = Apple [1] = banana [2] = pear [4] = wail [5] = Watermalon). Two, php two-dimensional array of duplicates: For a two-dimensional array we can be discussed, one is because the value of a key name cannot be duplicated, delete duplicates, and the other because the inner one-dimensional array can not be identical, and delete duplicates. Example 1, because the value of a key name cannot be duplicated, delete duplicates. Code: function Assoc_unique ($arr, $key) { $tmp _arr = Array (); foreach ($arr as $k = $v) { if (In_array ($v [$key], $tmp _arr))//Search $v[$key] is present in the $tmp_arr array, if there is a return true {//bbs.it-home.org Unset ($arr [$k]); } else { $tmp _arr[] = $v [$key]; } } Sort ($arr); Sort function sorting an array return $arr; } $AA = Array ( Array (' id ' = = 123, ' name ' = ' Zhang San '), Array (' id ' = = 123, ' name ' = ' John Doe '), Array (' id ' = = 124, ' name ' = ' Harry '), Array (' id ' = ' = ', ' name ' = ' Zhao Liu '), Array (' id ' = = 126, ' name ' = ' Zhao Liu ') ); $key = ' id '; Assoc_unique (& $aa, $key); Print_r ($AA); ?> Copy Code Output: Array ([0] = = Array ([id] = = 123 [Name] = + Zhang San) [1] = = Array ([id] = = 124 [name] = Harry) [2] = = Array ([id] = [name] = + Zhao Liu) [3] = = Array ([id] = 126 [name] + Zhao Liu)) Example 2, since the inner one-dimensional array cannot be identical, the deletion of the heavy The complex. Code: function ARRAY_UNIQUE_FB ($array 2D) { foreach ($array 2D as $v) { $v = Join (",", $v); Dimension, you can also convert one-dimensional array to a comma-concatenated string using implode $temp [] = $v; }//Bbs.it-home.org $temp = Array_unique ($temp); Remove duplicate strings, that is, duplicate one-dimensional arrays foreach ($temp as $k = = $v) { $temp [$k] = Explode (",", $v); Re-assemble the disassembled array } return $temp; } $AA = Array ( Array (' id ' = = 123, ' name ' = ' Zhang San '), Array (' id ' = = 123, ' name ' = ' John Doe '), Array (' id ' = = 124, ' name ' = ' Harry '), Array (' id ' = = 123, ' name ' = ' John Doe '), Array (' id ' = = 126, ' name ' = ' Zhao Liu ') ); $BB =ARRAY_UNIQUE_FB ($AA); Print_r ($BB) ?> Copy Code Output Result: Array ([0] = = Array ([0] = = 123 [1] = Zhang San) [1] = = Array ([0] = = 123 [1] = = Li four) [2] + = Array ([0 ] = 124 [1] = Harry) [4] = = Array ([0] = = 126 [1] = Zhao Liu))

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