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There can be multiple reasons for onclick JS function not working when included in a PHP echo statement:

1. Syntax errors: If there are syntax errors in the PHP or JS code, the onclick function may not work as expected. Check for any errors in the code by using a console or error logs.

2. Escape characters: If there are escape characters in the string of the onclick function, it can cause issues. Ensure that any escape characters are properly escaped in the code.

3. Conflicting code: If there is other conflicting code on the page, it may cause the onclick function to fail. Check for any other JS or PHP code that may be causing interference.

4. Element selection: If the element that the onclick function is supposed to attach to is not properly selected, the function may not work. Ensure that the correct element is selected and that the onclick function is attached to it.

5. Load order: If the JS file that contains the onclick function is not loaded before the HTML code, the function may not work. Ensure that the JS file is loaded before the code that calls the onclick function.