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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 |
|---|---|
| 537 | if ( is_array($size) ) |
| 538 | $size = join('x', $size); |
| 539 | $attachment =& get_post($attachment_id); |
| 540 | $attr = array( |
| 541 | 'src' => $src, |
| 542 | 'class' => "attachment-$size", |
| 543 | 'alt' => trim(strip_tags( $attachment->post_excerpt )), |
| 544 | 'title' => trim(strip_tags( $attachment->post_title )), |
| 545 | ); |
| 546 | $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment ); |
| 547 | $attr = array_map( 'esc_attr', $attr ); |
| 548 | $html = rtrim("<img $hwstring"); |
| 549 | foreach ( $attr as $name => $value ) { |
| 550 | $html .= " $name=" . '"' . $value . '"'; |
| 551 | } |
| 552 | $html .= ' />'; |
| 553 | } |
| 554 | |
| 555 | return $html; |