- print_r: documentation ( source)
<?php
$arr = array(
array('city' => 'NewYork', 'cash' => '1000'),
array('city' => 'Philadelphia', 'cash' => '2300'),
array('city' => 'NewYork', 'cash' => '2000'),
);
$newarray = array();
foreach($arr as $ar)
{
foreach($ar as $k => $v)
{
if(array_key_exists($v, $newarray))
$newarray[$v]['cash'] = $newarray[$v]['cash'] + $ar['cash'];
else if($k == 'city')
$newarray[$v] = $ar;
}
}
print_r($newarray);