<?php
 
function explodeArray($arr)
{
    $newArr = array();
    foreach($arr as $row)
    {
        $key = array_keys($row)[0];
        $curArr = count($newArr) > 0 ? $newArr[count($newArr)-1] : array();
        if( array_key_exists($key, $curArr) )
        {
            array_push($newArr, array($key=>$row[$key]) );
        }
        else
        {
            $index = count($newArr) > 0 ? count($newArr) - 1 : 0 ;
            $newArr[$index][$key] = $row[$key];
        }
    }
    return $newArr;
}
 
$detail = array(
        array('id'=>'item1'),
        array('price'=>300),
        array('quantity'=>1),
        array('id'=>'item2'),
        array('price'=>400),
        array('quantity'=>2)
    );
 
var_dump( explodeArray($detail) );
 
$detail_match = array(
        array('id'=>'item1'),
        array('price'=>300),
        array('quantity'=>1),
        array('newkey'=>'sample'),
        array('id'=>'item2'),
        array('price'=>400),
        array('quantity'=>2),
        array('newkey'=>'sample')
    );
 
var_dump( explodeArray($detail_match) ); // Works with any size of keys.
 
$detail_diff_key = array(
        array('id'=>'item1'),
        array('price'=>300),
        array('quantity'=>1),
        array('diff1'=>'sample1'),
        array('id'=>'item2'),
        array('price'=>400),
        array('quantity'=>2),
        array('diff2'=>'sample2')
    );
 
var_dump( explodeArray($detail_diff_key) ); // Works with any size of keys and different keys.
 
$detail_unmatch = array(
        array('id'=>'item1'),
        array('price'=>300),
        array('quantity'=>1),
        array('unmatchnum'=>'sample1'),
        array('id'=>'item2'),
        array('price'=>400),
        array('quantity'=>2)
    );
 
var_dump( explodeArray($detail_unmatch) );

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