WordPress WP Nav Menu Custom HTML ID Based on Page or Category Titles

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This function, when placed in a theme's 'functions.php' file will insert a custom id attribute into the '<li>' elements generated by a 'wp_nav_menu' function based on the title of the element. It will make a WordPress page or category into a hyphen separated string for CSS styling.

For example, if a post category has the name "This & That", it will generate an HTML id attribute as "this-that".

This version replaces spaces and ampersands - other characters can be added to the "str_replace" functions to filter out other characters that may exist in the "$item_details>title" property.

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