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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 |
|---|---|
| 2025 | $value = format_to_edit($value, user_can_richedit()); |
| 2026 | else |
| 2027 | $value = format_to_edit($value); |
| 2028 | } else { |
| 2029 | $value = esc_attr($value); |
| 2030 | } |
| 2031 | } else if ( 'db' == $context ) { |
| 2032 | if ( $prefixed ) { |
| 2033 | $value = apply_filters("pre_{$field}", $value); |
| 2034 | $value = apply_filters("{$field_no_prefix}_save_pre", $value); |
| 2035 | } else { |
| 2036 | $value = apply_filters("pre_post_{$field}", $value); |
| 2037 | $value = apply_filters("{$field}_pre", $value); |
| 2038 | } |
| 2039 | } else { |
| 2040 | // Use display filters by default. |
| 2041 | if ( $prefixed ) |
| 2042 | $value = apply_filters($field, $value, $post_id, $context); |
| 2043 | else |