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<?php
 
$arr = [[2012 => 'foo'],[2014 => 'bar'],[2015=>'baz']];
$new = [];
foreach($arr as $i) {
  $new += $i;
}
 
var_dump($new);

Success #stdin #stdout 0.03s 52432KB

stdin

Standard input is empty

stdout

array(3) {
  [2012]=>
  string(3) "foo"
  [2014]=>
  string(3) "bar"
  [2015]=>
  string(3) "baz"
}

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language:

PHP (php 7.3.5)

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