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How to programmatically rename a content type (change node type machine name)

Set old_type if you want to programmatically update a node type / machine name.

(This is not about changing the type of a node, but changing what type is called on the machine-info level.)

$type->old_type is what node_type_save() checks for when updating a node type, if it's not set it will create a new node type even if orig_type is set to an existing bundle. So really all you need to do right before saving a modified content type is set the old_type to the orig_type, such as:

<?php
$type
= node_type_load('example');
$type->type = 'new_machine_name';
$type->old_type = $type->orig_type// This will be 'example'.
node_type_save($type); // This will now result in SAVED_UPDATED (2)
?>

As noted when documenting this at the node_type_save API page, why orig_type is documented but old_type is checked for determining if we are renaming a node type, i have no idea and would greatly appreciate enlightenment.

Searched words: 
drupal programmatic rename content type drupal programmatic change machine name of content type drupal drupal 7 update node type machine-readable name

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