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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 |
|---|---|
| 3221 | |
| 3222 | // Private posts |
| 3223 | if ($post_type == 'post') { |
| 3224 | $cap = 'read_private_posts'; |
| 3225 | // Private pages |
| 3226 | } elseif ($post_type == 'page') { |
| 3227 | $cap = 'read_private_pages'; |
| 3228 | // Dunno what it is, maybe plugins have their own post type? |
| 3229 | } else { |
| 3230 | $cap = apply_filters('pub_priv_sql_capability', $cap); |
| 3231 | |
| 3232 | if (empty($cap)) { |
| 3233 | // We don't know what it is, filters don't change anything, |
| 3234 | // so set the SQL up to return nothing. |
| 3235 | return '1 = 0'; |
| 3236 | } |
| 3237 | } |
| 3238 | |
| 3239 | $sql = '(post_status = \'publish\''; |