


This article introduces the method of deduplicating PHP arrays, including deduplication of one-dimensional arrays and deduplication of two-dimensional arrays. Friends in need can refer to it.
First, let’s look at how to remove duplicate items from a one-dimensional array. Use array_unique function, for example: <?php $aa=array("apple","banana","pear","apple","wail","watermalon"); $bb=array_unique($aa); print_r($bb); //by bbs.it-home.org ?> Output result: Array ( [0] => apple [1] => banana [2] => pear [4] => wail [5] => watermalon ) . Let’s look at how to remove duplicate items from a two-dimensional array. For two-dimensional arrays, there are two situations to discuss: One is because the value of a certain key name cannot be repeated, so duplicate items are deleted; The other is to remove duplicates because the internal one-dimensional arrays cannot be exactly the same. Illustrate with specific examples. 1, because the value of a certain key name cannot be repeated, delete the duplicates. <?php function assoc_unique($arr, $key) { $tmp_arr = array(); foreach($arr as $k => $v) { if(in_array($v[$key], $tmp_arr))//搜索$v[$key]是否在$tmp_arr数组中存在,若存在返回true { unset($arr[$k]); } else { $tmp_arr[] = $v[$key]; } } sort($arr); //sort函数对数组进行排序 return $arr; } $aa = array( array('id' => 123, 'name' => '张三'), array('id' => 123, 'name' => '李四'), array('id' => 124, 'name' => '王五'), array('id' => 125, 'name' => '赵六'), array('id' => 126, 'name' => '赵六') ); $key = 'id'; assoc_unique(&$aa, $key); print_r($aa); //by bbs.it-home.org ?> Output result: Array ( [0] => Array ( [id] => 123 [name] => Zhang San) [1] => Array ( [id] => 124 [name] => Wang Wu) [2] => Array ([id] => 125 [name] => Zhao Liu) [3] => Array ( [id] => 126 [name] => Zhao Liu ) ) 2. Because the internal one-dimensional arrays cannot be exactly the same, duplicate items are deleted <?php function array_unique_fb($array2D){ foreach ($array2D as $v){ $v = join(",",$v); //降维,也可以用implode,将一维数组转换为用逗号连接的字符串 $temp[] = $v; } $temp = array_unique($temp); //去掉重复的字符串,也就是重复的一维数组 foreach ($temp as $k => $v){ $temp[$k] = explode(",",$v); //再将拆开的数组重新组装 } return $temp; } $aa = array( array('id' => 123, 'name' => '张三'), array('id' => 123, 'name' => '李四'), array('id' => 124, 'name' => '王五'), array('id' => 123, 'name' => '李四'), array('id' => 126, 'name' => '赵六') ); $bb=array_unique_fb($aa); print_r($bb); //by bbs.it-home.org ?> 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 Liu ) ) |

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