Combining vertical and horizontal lines, an upgraded version of the record set super processing function array_column is implemented

Highlights: Simplified operations, array_walk batch processing, references, and low internal consumption.

Application scenarios: Mainly used to process record sets (two-dimensional arrays)
1. Integrate result sets (one-dimensional arrays, such as ids: [1,3,4,5], list of winning user names: ['Xiong Ming' ,'lijia','Erlangshen'])
2. Combined key-value pair (one-dimensional array, such as tag: array('mysql'=>'url1','php'=>'url2'])
3. Cache File data (id=>info)

Note: PHP5.5 version is a built-in function, please pay attention to naming conflicts before use

From (EQPHP tool class): https://github.com/eqphp/framework/ blob/master/www/class/fun.php

Demo works: http://www.eqphp.com/blog/list/

 //Processing record sets (built-in in php5.5)
 static function array_column($data,$key='id',$column=null){

 $buffer=null;

 if ($column) {
 //k=>v
 if (strpos($column,',') === false) {
 foreach ($data as $value) {
 $buffer[$value[$key]]=$ value[$column];
 }
 return $buffer;
 }

 //k=arr
 $field=explode(',',$column);
 foreach ($data as $value) {
 $id= $value[$key];
 array_walk($value,function ($v,$k) use (&$value,$field){
 if (!in_array($k,$field)) unset($value[$ k]);
 });
 $buffer[$id]=$value;
 }
 return $buffer;
 }

 //id_arr
 foreach ($data as $value) {
 $buffer[]=$ value[$key];
 }
 return $buffer;
 }



//Usage demo:
//Original record set:
$data=array(
array('id'=>1,'name '=>'dubox','age'=>25,'girlfriend'=>'Soda Green'),
array('id'=>4,'name'=>'Xiao Chunzi',' age'=>21,'girlfriend'=>'don't know'),
array('id'=>9,'name'=>'idiot','age'=>71,'girlfriend '=>'widow'),
);

$ids=array_column($data,'id');
//out: array(1,4,9);

$info=array_column($data ,'name','girlfriend');
//out: array('dubox'=>'Soda Green','Xiao Chunzi'=>'I don't know','idiot'=>'Widow');

$cache=array_column($data,'id','name,age,girlfriend');
//out: array(
1=>array('name'=>'dubox','age' =>25,'girlfriend'=>'Soda Green'),
4=>array('name'=>'Xiao Chunzi','age'=>21,'girlfriend'=>'No know'),
9=>array('name'=>'idiot','age'=>71,'girlfriend'=>'widow'),
);