-
-
/** - * 去除数组中重复数据
- * by bbs.it-home.org
- **/
- $input = array("a" => "green","", "red","b" => "green", "","blue", "red","c" => "witer","hello","witer");
- //$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 $aa."
";
- }
- function multi_unique($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 $out;
- }
- ?>
-
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PHP自带的array_unique函数只适用于一维数组,对多维数组并不适用,这里实现一个php二维数组去重复的array_unique函数。
例子:
-
- /**
- * php二维数组去除重复数据
- * by bbs.it-home.org
- */
- function unique_arr($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;
- }
-
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调用示例:
-
- //数组去重
- $array2D =
- array('first'=>array('title'=>'1111','date'=>'2222'),'second'=>array('title'=>'1111','date'=>'2222'),'third'=>array('title'=>'2222','date'=>'3333'));
- print_r($array2D);
- print_r(unique_arr($array2D,true));
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