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@ 2019-11-26T12:03:56Z

<?php

$reduce_unwanted_colors = function (&$arr) use (&$reduce_unwanted_colors)
{
    $rand_key = array_rand($arr);
    if ($arr[$rand_key] != 'blue') {
        unset($arr[$rand_key]);
        $reduce_unwanted_colors($arr);
    }
};

$arr = ['red', 'green', 'blue', 'orange', 'yellow'];
$reduce_unwanted_colors($arr);
print_r($arr);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_rand: documentation ( source)

preferences:dark modelive previewkey bindings

13.38 ms | 405 KiB | 5 Q