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每日一博 | PHP中二维数组去除重复项小记

Jun 20, 2016 pm 12:29 PM

PHP中提供了array_unique函数去除一维数组中的重复项,但是我们实际的项目开发中,从数据库select查询出来的数组经常是二维的;

这里面可能有重复项,这就需要我们自己定义函数进行去除重复项。

思路:

1、首先获取第二维数组的键名,保存在一个数组里面(假设命名为keyname_Arr);

2、然后使用一个符号做分隔符(比如‘-’),将二维数组里面的键值 拼接 成一个字符串,生成一个临时数组;

3、然后使用【array_unique()函数】比较生成的这个临时数组,去掉里面的相同字符串;

4、然后将去除重复后的数组重新组装成二维数组:

在foreach()里面循环使用【explode()函数】,按‘-’分隔符拆分字符串;

同时在foreach()里面对拆分出来的字符串所形成的【新的临时数组tempnew】,再使用一个foreach( $ tempnew as $tempk =>$tempv ),

循环赋值 $output[ $k ][ $ keyname_Arr[ $tempk ]   ] =  tempv ;

6、最后,$ output即是去除重复后的二维数组。

来点实际代码理解一下:

$keyname_Arr= array_keys(end($resource_arr)); //存储内层数组的键名//使用'-'作为分隔将数组拼接成字符串foreach ($resource_arr 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){ $tempnew = explode("-",$v);//拆分去重之后的字符串 foreach($tempnew as $tempkey => $tempval) $output[$k][$keyname_Arr[$tempkey]] = $tempval;}
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