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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 |
|---|---|
| 1991 | * Filter the value of a specific post field before saving. |
| 1992 | * |
| 1993 | * The dynamic portion of the hook name, `$field`, refers to the post |
| 1994 | * field name. |
| 1995 | * |
| 1996 | * @since 2.3.0 |
| 1997 | * |
| 1998 | * @param mixed $value Value of the post field. |
| 1999 | */ |
| 2000 | $value = apply_filters( "{$field}_pre", $value ); |
| 2001 | } |
| 2002 | } else { |
| 2003 | |
| 2004 | // Use display filters by default. |
| 2005 | if ( $prefixed ) { |
| 2006 | |
| 2007 | /** |
| 2008 | * Filter the value of a specific post field for display. |
| 2009 | * |