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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 |
|---|---|
| 556 | 'class' => "attachment-$size", |
| 557 | 'alt' => trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )), // Use Alt field first |
| 558 | ); |
| 559 | if ( empty($default_attr['alt']) ) |
| 560 | $default_attr['alt'] = trim(strip_tags( $attachment->post_excerpt )); // If not, Use the Caption |
| 561 | if ( empty($default_attr['alt']) ) |
| 562 | $default_attr['alt'] = trim(strip_tags( $attachment->post_title )); // Finally, use the title |
| 563 | |
| 564 | $attr = wp_parse_args($attr, $default_attr); |
| 565 | $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment ); |
| 566 | $attr = array_map( 'esc_attr', $attr ); |
| 567 | $html = rtrim("<img $hwstring"); |
| 568 | foreach ( $attr as $name => $value ) { |
| 569 | $html .= " $name=" . '"' . $value . '"'; |
| 570 | } |
| 571 | $html .= ' />'; |
| 572 | } |
| 573 | |
| 574 | return $html; |