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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 | 
|---|---|
| 1940 |                 * Filters the value of a specific post field before saving. | 
| 1941 |                 * | 
| 1942 |                 * The dynamic portion of the hook name, `$field`, refers to the post | 
| 1943 |                 * field name. | 
| 1944 |                 * | 
| 1945 |                 * @since 2.3.0 | 
| 1946 |                 * | 
| 1947 |                 * @param mixed $value Value of the post field. | 
| 1948 |                 */ | 
| 1949 |                $value = apply_filters( "{$field}_pre", $value ); | 
| 1950 |           } | 
| 1951 |      } else { | 
| 1952 |  | 
| 1953 |           // Use display filters by default. | 
| 1954 |           if ( $prefixed ) { | 
| 1955 |  | 
| 1956 |                /** | 
| 1957 |                 * Filters the value of a specific post field for display. | 
| 1958 |                 * |