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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 |
|---|---|
| 650 | 'alt' => trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )), // Use Alt field first |
| 651 | 'title' => trim(strip_tags( $attachment->post_title )), |
| 652 | ); |
| 653 | if ( empty($default_attr['alt']) ) |
| 654 | $default_attr['alt'] = trim(strip_tags( $attachment->post_excerpt )); // If not, Use the Caption |
| 655 | if ( empty($default_attr['alt']) ) |
| 656 | $default_attr['alt'] = trim(strip_tags( $attachment->post_title )); // Finally, use the title |
| 657 | |
| 658 | $attr = wp_parse_args($attr, $default_attr); |
| 659 | $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment ); |
| 660 | $attr = array_map( 'esc_attr', $attr ); |
| 661 | $html = rtrim("<img $hwstring"); |
| 662 | foreach ( $attr as $name => $value ) { |
| 663 | $html .= " $name=" . '"' . $value . '"'; |
| 664 | } |
| 665 | $html .= ' />'; |
| 666 | } |
| 667 | |
| 668 | return $html; |