Home Backend Development PHP Tutorial PHP中二维数组去处重复项小记--可以类比php其他处理二维数组_排序,转换,去空白等等

PHP中二维数组去处重复项小记--可以类比php其他处理二维数组_排序,转换,去空白等等

Jun 23, 2016 pm 01:07 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即使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<br /><br />//使用'-'作为分隔将数组拼接成字符串<br />foreach ($resource_arr as $v){<br />    $v = join("-",$v);<br />    $temp[] = $v;<br />}<br /><br />//去掉重复的字符串,也就是重复的一维数组<br />$temp = array_unique($temp);<br /><br />//再将拆开的数组重新组装<br />foreach ($temp as $k => $v)<br />{<br />    $tempnew = explode("-",$v);//拆分去重之后的字符串<br /><br />    foreach($tempnew as $tempkey => $tempval)<br />        $output[$k][$keyname_Arr[$tempkey]] = $tempval;<br />}
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