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@ 2019-02-06T10:56:50Z

<?php
$mark = array(90,85);

array_walk_recursive($mark, function (&$k) { 
    if ($k >= 90) {
        echo "$k: 4.0\n";
        $k = '4.0';
    } else if ($k >= 80 && $k<90) {
        echo "$k: 3.6\n";
        $k = '3.6';
    } else if ($k < 80) {
        echo "$k: 2.8\n";
        $k = '2.8';
    }
});

print_r($mark);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_walk_recursive: documentation ( source)

preferences:dark modelive preview

45.1 ms | 402 KiB | 5 Q