php中array_unique去除二维数组中重复的数组
一个利用php中array_unique实现去除二级数组重复值的方法,有需要的朋友可参考参考.
实例代码如下:
<?php $input = array("a" => "green","", "red","b" => "green", "","blue", "red","c" => "witer","hello","witer"); //$result = array_unique($input); //去除重复元素 $result = a_array_unique($input); ? ? //只留下单一元素 foreach ($result as $aa) { echo $aa . "<br />"; } function multi_unique($array) { foreach ($array as $k => $na) $new[$k] = serialize($na); $uniq = array_unique($new); foreach ($uniq as $k => $ser) $new1[$k] = unserialize($ser); return ($new1); } function a_array_unique($array) //写的比较好 { $out = array(); foreach ($array as $key => $value) { if (!in_array($value, $out)) { $out[$key] = $value; } } return $out; } ?>
array_unique函数只适用于一维数组,对多维数组并不适用,但是我们利用遍历数据然后再进行操作就可以实现array_unique去除重复数组了.
实例代码如下:
<?php function unique_arr($array2D, $stkeep = false, $ndformat = true) { // 判断是否保留一级数组键 (一级数组键可以为非数字) if ($stkeep) $stArr = array_keys($array2D); // 判断是否保留二级数组键 (所有二级数组键必须相同) if ($ndformat) $ndArr = array_keys(end($array2D)); //降维,也可以用implode,将一维数组转换为用逗号连接的字符串 foreach ($array2D as $v) { $v = join(",", $v); $temp[] = $v; } //去掉重复的字符串,也就是重复的一维数组 $temp = array_unique($temp); //再将拆开的数组重新组装 foreach ($temp as $k => $v) { if ($stkeep) $k = $stArr[$k]; if ($ndformat) { $tempArr = explode(",", $v); foreach ($tempArr as $ndkey => $ndval) $output[$k][$ndArr[$ndkey]] = $ndval; } else $output[$k] = explode(",", $v); } return $output; } $array2D = array( 'first' => array( 'title' => '1111', 'date' => '2222' ) , 'second' => array( 'title' => '1111', 'date' => '2222' ) , 'third' => array( 'title' => '2222', 'date' => '3333' ) ); print_r($array2D); print_r(unique_arr($array2D, true)); ?>
文章地址:http://www.phprm.com/shuzu/fs2133.html
转载随意^^请带上本文地址!