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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 |
|---|---|
| 1914 | * Filters the value of a specific post field before saving. |
| 1915 | * |
| 1916 | * The dynamic portion of the hook name, `$field`, refers to the post |
| 1917 | * field name. |
| 1918 | * |
| 1919 | * @since 2.3.0 |
| 1920 | * |
| 1921 | * @param mixed $value Value of the post field. |
| 1922 | */ |
| 1923 | $value = apply_filters( "pre_{$field}", $value ); |
| 1924 | |
| 1925 | /** |
| 1926 | * Filters the value of a specific field before saving. |
| 1927 | * |
| 1928 | * The dynamic portion of the hook name, `$field_no_prefix`, refers |
| 1929 | * to the post field name. |
| 1930 | * |
| 1931 | * @since 2.3.0 |
| 1932 | * |