- var_dump: documentation ( source)
<?php
$originArr=array(
array('amount'=>100,'date'=>'2014-03-29'),
array('amount'=>120,'date'=>'2014-03-30'),
array('amount'=>200,'date'=>'2014-03-31'),
array('amount'=>300,'date'=>'2014-04-31'),
array('amount'=>400,'date'=>'2014-05-31')
);
$newArr1 = array();
$newArr2 = array();
$tempArr = array();
$resultArr = array();
foreach($originArr as $el) {
$newArr1[$el['date']] = $el['amount'];
}
foreach ($newArr1 as $k1 => $v1) {
foreach ($newArr1 as $k2 => $v2) {
$v1 += ($k1 > $k2) ? $v2 : 0;
}
$newArr2[$k1] = $v1;
}
foreach($newArr2 as $key => $value) {
$tempArr['amount'] = $value;
$tempArr['date'] = $key;
$resultArr[] = $tempArr;
}
var_dump($resultArr);