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@ 2015-03-04T11:40:00Z

<?php


$a = array("100","200","350"); 
$b = 400; // Is not a array is the finding value;

$left = $b;
$new_array = [];
for($i=0;$i<count($a);$i++)
{
    $new_value[] = max($a[$i]-$left, 0);
    $left = max($left - $a[$i], 0);
}

var_dump($new_value);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
max: documentation ( source)

preferences:dark modelive preview

40.42 ms | 402 KiB | 5 Q