PHP: How to use a substring to access global variables having a dependent name in a switch statement

Question

I have a long list of PHP switch statements that differ only in a substring, such as with strx, stry and strz as shown below:

    switch ($block_name) {
            case "strx_blk":
                    $list = &$GLOBALS['strx_list'];
                    $checked = $GLOBALS['strx_checked'];
                    break;
            case "stry_blk":
                    $list = &$GLOBALS['stry_list'];
                    $checked = $GLOBALS['stry_checked'];
                    break;
            case "strz_blk":
                    $list = &$GLOBALS['strz_list'];
                    $checked = $GLOBALS['strz_checked'];
                    break;
    }

I would like to know if there a more compact way to express the same logic in PHP. There could be a large number of such repetitions hence the necessity for automation.

Barmar · Accepted Answer · 2016-03-01 17:40:51Z

1

You can split up $block_name and concatenate the prefix to the array indexes.

$array = explode('_', $block_name);
$prefix = $array[0];
$list = &$GLOBALS[$prefix . "_list"];
$checked = $GLOBALS[$PREFIX . "_checked"];

answered Mar 1, 2016 at 17:40

Barmar

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2 Comments

Quiescent Over a year ago

Thanks, I got the gist. list($prefix) = explode("_", $block_name); can replace the first two lines I think.

Barmar Over a year ago

Yes, you can do that if you like.

u_mulder · Accepted Answer · 2016-03-01 17:41:04Z

0

$part1 = 'strz';
$part2 = 'list';
var_dump($GLOBALS[$part1 . '_' . $part2]);

answered Mar 1, 2016 at 17:41

u_mulder

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1 Comment

Barmar Over a year ago

But $part1 changes depending on the value of $block_name.

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