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  • define( 'WP_DEBUG', true );

    I take a message :

    Invalid characters passed for attempted conversion, these have been ignored in line
    
    $red = hexdec(substr($hex, 0, 2)) / 255;

    Let’s say that turn of the ‘WP_DEBUG' then it gave the same results. hsl(137, 99%, 42%) instead of hsl(258, 83%, 45%)

    I believe that the function gave me wrong results.. 🙁