WordPress/wp-includes/default-filters.php

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<?php
// Some default filters
add_filter('bloginfo','wp_specialchars');
add_filter('category_description', 'wptexturize');
add_filter('list_cats', 'wptexturize');
add_filter('comment_author', 'wptexturize');
add_filter('comment_text', 'wptexturize');
add_filter('single_post_title', 'wptexturize');
add_filter('the_title', 'wptexturize');
add_filter('the_content', 'wptexturize');
add_filter('the_excerpt', 'wptexturize');
add_filter('bloginfo', 'wptexturize');
// Comments, trackbacks, pingbacks
add_filter('pre_comment_author_name', 'strip_tags');
add_filter('pre_comment_author_name', 'trim');
add_filter('pre_comment_author_name', 'wp_specialchars', 30);
add_filter('pre_comment_author_email', 'trim');
add_filter('pre_comment_author_email', 'sanitize_email');
add_filter('pre_comment_author_url', 'strip_tags');
add_filter('pre_comment_author_url', 'trim');
add_filter('pre_comment_author_url', 'clean_url');
add_filter('pre_comment_content', 'stripslashes', 1);
add_filter('pre_comment_content', 'wp_filter_kses');
add_filter('pre_comment_content', 'wp_rel_nofollow', 15);
add_filter('pre_comment_content', 'balanceTags', 30);
add_filter('pre_comment_content', 'addslashes', 50);
add_filter('pre_comment_author_name', 'wp_filter_kses');
add_filter('pre_comment_author_email', 'wp_filter_kses');
add_filter('pre_comment_author_url', 'wp_filter_kses');
// Default filters for these functions
add_filter('comment_author', 'wptexturize');
add_filter('comment_author', 'convert_chars');
add_filter('comment_author', 'wp_specialchars');
add_filter('comment_email', 'antispambot');
add_filter('comment_url', 'clean_url');
add_filter('comment_text', 'convert_chars');
add_filter('comment_text', 'make_clickable');
add_filter('comment_text', 'wpautop', 30);
add_filter('comment_text', 'convert_smilies', 20);
add_filter('comment_text_rss', 'htmlspecialchars');
add_filter('comment_excerpt', 'convert_chars');
add_filter('the_excerpt_rss', 'convert_chars');
// Places to balance tags on input
add_filter('content_save_pre', 'balanceTags', 50);
add_filter('excerpt_save_pre', 'balanceTags', 50);
add_filter('comment_save_pre', 'balanceTags', 50);
add_filter('the_title', 'convert_chars');
add_filter('the_title', 'trim');
add_filter('the_title_rss', 'strip_tags');
add_filter('the_content', 'convert_smilies');
add_filter('the_content', 'convert_chars');
add_filter('the_content', 'wpautop');
add_filter('the_excerpt', 'convert_smilies');
add_filter('the_excerpt', 'convert_chars');
add_filter('the_excerpt', 'wpautop');
add_filter('sanitize_title', 'sanitize_title_with_dashes');
add_action('publish_post', 'generic_ping');
?>