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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 |
|---|---|
| 1762 | } else { |
| 1763 | $value = esc_attr($value); |
| 1764 | } |
| 1765 | } else if ( 'db' == $context ) { |
| 1766 | if ( $prefixed ) { |
| 1767 | $value = apply_filters("pre_{$field}", $value); |
| 1768 | $value = apply_filters("{$field_no_prefix}_save_pre", $value); |
| 1769 | } else { |
| 1770 | $value = apply_filters("pre_post_{$field}", $value); |
| 1771 | $value = apply_filters("{$field}_pre", $value); |
| 1772 | } |
| 1773 | } else { |
| 1774 | // Use display filters by default. |
| 1775 | if ( $prefixed ) |
| 1776 | $value = apply_filters($field, $value, $post_id, $context); |
| 1777 | else |
| 1778 | $value = apply_filters("post_{$field}", $value, $post_id, $context); |
| 1779 | } |
| 1780 | |