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Currently, many of our modules have no .install file, yet they set Druapl Drupal system variables that would get left behind in the database if the module were disabled/removed. Adding this function to an existing .install file, or creating a blank .install file with just this function will remedy this. If the .install file already has a hook_uninstall() function, check the code to make sure it does something similar to this funciton to clean up its variables.
This works for version 5.x and 6.x modules.
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| borderStyle | solid |
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| title | modulename.install | borderStyle | solid |
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<?php
function modulename_uninstall() {
// remove module system variables
$module_name = 'modulename';
$vars = db_query("select * from {variable} where name like '" . $module_name . "%'");
while ($var = db_fetch_object($vars)) {
variable_del($var->name);
}
}
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Renaming system variables when changing module name
| Code Block |
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| borderStyle | solid |
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| title | modulename.install | borderStyle | solid |
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<?php
function newmodulename_install() {
// rename module system variables
$oldname = 'modulename';
$newname = 'newmodulename';
$vars = db_query("select * from {variable} where name like '" . $oldname . "%'");
while ($var = db_fetch_object($vars)) {
$newvar = str_replace($oldname,$newname,$var->name);
variable_set($newvar, variable_get($var->name, NULL));
variable_del($var->name);
}
}
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