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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 |
|---|---|
| 1961 | $value = apply_filters("pre_{$field}", $value); |
| 1962 | $value = apply_filters("{$field_no_prefix}_save_pre", $value); |
| 1963 | } else { |
| 1964 | $value = apply_filters("pre_post_{$field}", $value); |
| 1965 | $value = apply_filters("{$field}_pre", $value); |
| 1966 | } |
| 1967 | } else { |
| 1968 | // Use display filters by default. |
| 1969 | if ( $prefixed ) |
| 1970 | $value = apply_filters($field, $value, $post_id, $context); |
| 1971 | else |
| 1972 | $value = apply_filters("post_{$field}", $value, $post_id, $context); |
| 1973 | } |
| 1974 | |
| 1975 | if ( 'attribute' == $context ) |
| 1976 | $value = esc_attr($value); |
| 1977 | else if ( 'js' == $context ) |
| 1978 | $value = esc_js($value); |
| 1979 | |