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Netbeans does not complete this code by default, so you will have to manually add the code template.
In Netbeans click on:
Tools > Options > Editor > Code Templates
Choose the language HTML as this is being used until you put the PHP tag.
Click on New, type which shortcut you want to autocomplete, for example php, click on OK.
On the next screen enter the code you want to autocomplete when writing php.
Example:
<?php ?>
In Expand Model in: select the key you want to trigger the autocomplete, for example: Tab.
Click on OK.
When you’re testing put the shortcut that in my case php and then press Tab.
"And see the Magic!"
For more information: https://netbeans.org/kb/docs/php/code-templates_pt_BR.html

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– Bruno Folle