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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 |
|---|---|
| 3187 | * - `pinged_pre` |
| 3188 | * - `guid_pre` |
| 3189 | * - `menu_order_pre` |
| 3190 | * - `comment_count_pre` |
| 3191 | * |
| 3192 | * @since 2.3.0 |
| 3193 | * |
| 3194 | * @param mixed $value Value of the post field. |
| 3195 | */ |
| 3196 | $value = apply_filters( "{$field}_pre", $value ); |
| 3197 | } |
| 3198 | } else { |
| 3199 | |
| 3200 | // Use display filters by default. |
| 3201 | if ( $prefixed ) { |
| 3202 | |
| 3203 | /** |
| 3204 | * Filters the value of a specific post field for display. |
| 3205 | * |