Replace the attribute_escape to esc_attr()

Deprecation is…

status applied to features, characteristics, or practices to indicate that they should be avoided, typically because they have been superseded.

In other words, attribute_escape has been replaced by esc_attr.

Any time you use a deprecated function WordPress triggers the error you’re seeing. Somewhere in your codebase a deprecated function is being used.

To fix the error, you need to locate where attribute_escape is in your code. It won’t be in the WordPress core as deprecated function calls are removed.

So, search your entire wp-content directory for attribute_escape. When you find it, replace it with esc_attr. I would use the command like ack-grep for this.

$ cd /path/to/your/wordpress/install/wp-content
$ ack-grep attribute_escape

But any filesystem search will probably work just fine.

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