https://www.worldoweb.co.uk/2016/wordpress-functions-php-super-snippets
WordPress Functions PHP Super Useful Snippets | WorldOWeb
A collection of super useful WordPress functions.php snippets to enhance your WordPress theme, including responsive images, conditional comments for IE, author...
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https://wilbrown.com/how-to-use-wordpress-functions-in-a-non-wordpress-custom-php-file-wpquickies/
How to Use WordPress Functions in a Non-WordPress Custom PHP File - WPQuickies
In this lunchtime #WPQuickies, I show you how to use WordPress functions inside non-WordPress custom PHP files.
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https://functions.fs-create.net/archives/tag/smart-custom-fields
Smart Custom Fields - WordPress functions.php
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https://functions.fs-create.net/archives/tag/dmarc
DMARC - WordPress functions.php
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https://adambrown.info/p/wp_hooks/version/3.4/wp-content/themes/twentyeleven/functions.php?order=type
View all hooks in wp-content/themes/twentyeleven/functions.php, WordPress 3.4 -- Adam Brown, BYU...
Detailed information about every action hook and filter used in WordPress. Makes Plugin API easier to use. Lists appearance, file location, and deprecation...