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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 |
|---|---|
| 2931 | * The dynamic portion of the hook name, `$field_no_prefix`, refers |
| 2932 | * to the post field name. |
| 2933 | * |
| 2934 | * @since 2.3.0 |
| 2935 | * |
| 2936 | * @param mixed $value Value of the post field. |
| 2937 | */ |
| 2938 | $value = apply_filters( "{$field_no_prefix}_save_pre", $value ); |
| 2939 | } else { |
| 2940 | $value = apply_filters( "pre_post_{$field}", $value ); |
| 2941 | |
| 2942 | /** |
| 2943 | * Filters the value of a specific post field before saving. |
| 2944 | * |
| 2945 | * The dynamic portion of the hook name, `$field`, refers to the post |
| 2946 | * field name. |
| 2947 | * |
| 2948 | * @since 2.3.0 |
| 2949 | * |