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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 |
|---|---|
| 2244 | * |
| 2245 | * @param mixed $value Value of the prefixed post field. |
| 2246 | * @param int $post_id Post ID. |
| 2247 | * @param string $context Context for how to sanitize the field. Possible |
| 2248 | * values include 'raw', 'edit', 'db', 'display', |
| 2249 | * 'attribute' and 'js'. |
| 2250 | */ |
| 2251 | $value = apply_filters( $field, $value, $post_id, $context ); |
| 2252 | } else { |
| 2253 | $value = apply_filters( "post_{$field}", $value, $post_id, $context ); |
| 2254 | } |
| 2255 | } |
| 2256 | |
| 2257 | if ( 'attribute' == $context ) |
| 2258 | $value = esc_attr($value); |
| 2259 | elseif ( 'js' == $context ) |
| 2260 | $value = esc_js($value); |
| 2261 | |
| 2262 | return $value; |