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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 |
|---|---|
| 2072 | * The dynamic portion of the hook name, $field_no_prefix, refers |
| 2073 | * to the post field name. |
| 2074 | * |
| 2075 | * @since 2.3.0 |
| 2076 | * |
| 2077 | * @param mixed $value Value of the post field. |
| 2078 | */ |
| 2079 | $value = apply_filters( "{$field_no_prefix}_save_pre", $value ); |
| 2080 | } else { |
| 2081 | $value = apply_filters( "pre_post_{$field}", $value ); |
| 2082 | |
| 2083 | /** |
| 2084 | * Filter the value of a specific post field before saving. |
| 2085 | * |
| 2086 | * The dynamic portion of the hook name, $field, refers to the post field name. |
| 2087 | * |
| 2088 | * @since 2.3.0 |
| 2089 | * |
| 2090 | * @param mixed $value Value of the post field. |