PHP array De-weight

PHP array De-weight(2011-04-13 18:03:53) reproduced

tags: Gossip

Category: JavaScript

The removal of duplicates in an array 2010-07-28 15:29

duplicate entries for one-dimensional arrays : Using the Array_unique function, you can use the following example: <?php $aa =array ("apple", "banana", "pear", "apple", "wail", "watermalon"); $BB =array_unique ($aa); Print_r ($bb); ?> The results are as follows: Array ([0] = Apple [1] = Banana [2] = Pear [4] = Wail [5] = watermalon). duplicate entries for two-dimensional arrays : For a two-dimensional array we can be discussed in one way or another because the value of one key name cannot be duplicated, and the other is because the inner one-dimensional array cannot be identical and the duplicates are deleted, the following example Illustrates: ㈠ Delete duplicates because the value of a key name cannot be duplicated <?php function Assoc_unique ($arr, $key) { $tmp _arr = Array (); foreach ($arr as $k = $v) { If (in_array ($v [$key], $tmp _arr))//search $v[$key] is present in the $tmp_arr array, if there is a return true { unset ($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); ?> The result is: array ([0] = = Array ([id] = = 123 [name] = + Zhang San) [1] = = Array ([id] = = 124 [name] = Harry) [2] =& Gt Array ([id] = [name] = + Zhao Liu) [3] = = Array ([id] = 126 [name] = Zhao Liu)) ㈡ because an internal one-dimensional array cannot be exactly the same, and delete duplicates <?php 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; } $temp = Array_unique ($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) ?> Display Results: 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))

PHP array De-weight