How does Magento handle multiple modules overriding the same core file? Is it possible?

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Editorial Team

Asked: June 18, 20262026-06-18T15:27:52+00:00 2026-06-18T15:27:52+00:00

How does Magento handle multiple modules overriding the same core file? Is it possible? How is it done?

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Editorial Team · Answer 1 · 2026-06-18T15:27:53+00:00

You have 3 choices for resolving conflicts:

Merge the code from one conflicting file into another and switch off the rewrite config.xml in one
Switch off the rewrite in one config.xml and then make the conflicting extension PHP file extend the other extension
Use the <depends> capability to make one extension depend on another. They will then rewrite in that order

Example (option # 2)

class A_Extension_Model_Type_Onepage extends Mage_Checkout_Model_Type_Onepage

You would change it to:

class A_Extension_Model_Type_Onepage extends B_Extension_Model_Type_Onepage

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