- array_combine: documentation ( source)
- json_decode: documentation ( source)
- print_r: documentation ( source)
<?php
$input='
{
"label_values":[
"OK1","OK2","OK3"
]
}';
$obj = json_decode($input);
$results = $obj->{'label_values'};
$result = array_combine( $results, $results );
print_r( $result );