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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 915 | if ( 'post_content' == $field ) |
| 916 | $value = format_to_edit($value, user_can_richedit()); |
| 917 | else |
| 918 | $value = format_to_edit($value); |
| 919 | } else { |
| 920 | $value = esc_attr($value); |
| 921 | } |
| 922 | } else if ( 'db' == $context ) { |
| 923 | if ( $prefixed ) { |
| 924 | $value = apply_filters("pre_$field", $value); |
| 925 | $value = apply_filters("${field_no_prefix}_save_pre", $value); |
| 926 | } else { |
| 927 | $value = apply_filters("pre_post_$field", $value); |
| 928 | $value = apply_filters("${field}_pre", $value); |
| 929 | } |
| 930 | } else { |
| 931 | // Use display filters by default. |
| 932 | if ( $prefixed ) |
| 933 | $value = apply_filters($field, $value, $post_id, $context); |