php - how do I get the switch command to work if the field is empty to return n/a -

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hello wrote following code i'm having small problem.

in data base have field called gf_gemstone wrote switch script (below)

the last part want write if field empty return n/a. no matter can't work. can body help.

 case "gf_gemstone_amazon1a":             switch ($value) {                 case "agate":                     return "agate";                     break;                 case "amethyst":                     return "amethyst";                     break;                 case "aquamarine":                     return "aquamarine";                     break;                 case "black diamond":                     return "black-diamond";                     break;                 case "black sapphire":                     return "sapphire";                     break;                 case "blue diamond":                     return "blue-diamond";                     break;                 case "blue sapphire":                     return "blue-sapphire";                     break;                 case "blue topaz":                     return "blue-topaz";                     break;                 case "chalcedony":                     return "chalcedony";                     break;                 case "citrine":                     return "citrine";                     break;                 case "cognac diamond":                     return "brown-diamond";                     break;                 case "diamond":                     return "diamond";                     break;                 case "emerald":                     return "emerald";                     break;                 case "garnet":                     return "garnet";                     break;                 case "green amethyst":                     return "green-quartz";                     break;                 case "green quartz":                     return "green-quartz";                     break;                 case "green sapphire":                     return "green-sapphire ";                     break;                 case "lemon quartz":                     return "lemon-quartz";                     break;                 case "morganite":                     return "morganite";                     break;                 case "multi sapphire":                     return "sapphire";                     break;                 case "onyx":                     return "onyx";                     break;                 case "opal":                     return "opal";                     break;                 case "orange sapphire":                     return "sapphire";                     break;                 case "peridot":                     return "peridot";                     break;                 case "pink sapphire":                     return "pink-sapphire";                     break;                 case "pink sapphire":                     return "pink-sapphire";                     break;                 case "pink topaz":                     return  "pink-topaz";                     break;                 case "pink tourmaline":                     return "pink-tourmaline";                     break;                 case "quartz":                     return "quartz";                     break;                 case "rose quartz":                     return "rose-quartz";                     break;                 case "rhodolite garnet":                     return "rhodolite-garnet";                     break;                 case "ruby":                     return "ruby";                     break;                 case "sapphire":                     return "sapphire";                     break;                 case "smokey quartz":                     return "smoky-quartz";                     break;                 case "spessartite":                     return "spessartite-garnet";                     break;                 case "tanzanite":                     return "tanzanite";                     break;                 case "tsavorite":                     return "tsavorite";                     break;                 case "turquoise":                     return "turquoise";                     break;                 case "white sapphire":                     return "sapphire";                     break;                 case "yellow diamond":                     return "yellow-diamond";                     break;                 case "yellow sapphire":                     return "sapphire";                     break;                         case "":                     return "n/a";                     break;               default: return "";             }             break;

you write far more compactly as:

$stones = array('agate' => 'agate', 'amethyst' => 'amethyst', etc...); if (in_array($value, array_keys($stones))) {    return $stones[$val]; } else {    return "n/a"; }

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