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Filter array by KEY

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I would like to create an array from the one below that can sort of filter using date ranges;


For example, make an array that contains data using date <= 2018-05-09 without a loop.


A loop is an option just wondering if you can filter by keys somehow.

    [2018-04-23 21:31:40] => -1.174
    [2018-04-24 15:43:59] => -1.015
    [2018-04-26 00:14:10] => -0.37
    [2018-04-30 18:41:51] => -1.042
    [2018-05-01 20:08:40] => -0.72
    [2018-05-02 22:11:52] => -0.107
    [2018-05-07 18:40:12] => -0.298
    [2018-05-09 16:35:38] => -0.36
    [2018-05-10 01:14:27] => 0.408
    [2018-05-14 20:49:54] => 1.549
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It's a little reckless, but I'm implementing the loop like this.

$d = date('Y-m-d', strtotime('last Sunday', strtotime(date('Y-m-d'))));
$d = $d." 23:59:59";
foreach($combine as $key => $b){
  if(strtotime($key) >= strtotime($d)){

A filter that does the same would be awesome..

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  • Solution

Rather than hardcoding the date as I did above


$sunday = (new DateTime('last sunday'))->format('Y-m-d');                                            
$arr = array_filter($arr, function($v) use ($sunday) { return $v < $sunday;}, ARRAY_FILTER_USE_KEY);
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