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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 |
|---|---|
| 2221 | * Filter the value of a specific post field before saving. |
| 2222 | * |
| 2223 | * The dynamic portion of the hook name, `$field`, refers to the post |
| 2224 | * field name. |
| 2225 | * |
| 2226 | * @since 2.3.0 |
| 2227 | * |
| 2228 | * @param mixed $value Value of the post field. |
| 2229 | */ |
| 2230 | $value = apply_filters( "{$field}_pre", $value ); |
| 2231 | } |
| 2232 | } else { |
| 2233 | |
| 2234 | // Use display filters by default. |
| 2235 | if ( $prefixed ) { |
| 2236 | |
| 2237 | /** |
| 2238 | * Filter the value of a specific post field for display. |
| 2239 | * |