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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 |
|---|---|
| 2200 | * The dynamic portion of the hook name, `$field_no_prefix`, refers |
| 2201 | * to the post field name. |
| 2202 | * |
| 2203 | * @since 2.3.0 |
| 2204 | * |
| 2205 | * @param mixed $value Value of the post field. |
| 2206 | */ |
| 2207 | $value = apply_filters( "{$field_no_prefix}_save_pre", $value ); |
| 2208 | } else { |
| 2209 | $value = apply_filters( "pre_post_{$field}", $value ); |
| 2210 | |
| 2211 | /** |
| 2212 | * Filter the value of a specific post field before saving. |
| 2213 | * |
| 2214 | * The dynamic portion of the hook name, `$field`, refers to the post |
| 2215 | * field name. |
| 2216 | * |
| 2217 | * @since 2.3.0 |
| 2218 | * |