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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 |
|---|---|
| 1952 | if ( 'post_content' == $field ) |
| 1953 | $value = format_to_edit($value, user_can_richedit()); |
| 1954 | else |
| 1955 | $value = format_to_edit($value); |
| 1956 | } else { |
| 1957 | $value = esc_attr($value); |
| 1958 | } |
| 1959 | } else if ( 'db' == $context ) { |
| 1960 | if ( $prefixed ) { |
| 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); |