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<?php
 
$old = array('white', 'blue', 'black');
$newArray = array();
 
foreach($old as $value){
$newArray["$value"] = $value;
}
var_dump($newArray);

Success #stdin #stdout 0.01s 24400KB

stdin

Standard input is empty

stdout

array(3) {
  ["white"]=>
  string(5) "white"
  ["blue"]=>
  string(4) "blue"
  ["black"]=>
  string(5) "black"
}

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PHP (php 7.3.5)

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