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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 |
---|---|
716 |
|
717 | /** |
718 | * Filter the list of attachment image attributes. |
719 | * |
720 | * @since 2.8.0 |
721 | * |
722 | * @param mixed $attr Attributes for the image markup. |
723 | * @param int $attachment_id Image attachment ID. |
724 | */ |
725 | $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment ); |
726 | $attr = array_map( 'esc_attr', $attr ); |
727 | $html = rtrim("<img $hwstring"); |
728 | foreach ( $attr as $name => $value ) { |
729 | $html .= " $name=" . '"' . $value . '"'; |
730 | } |
731 | $html .= ' />'; |
732 | } |
733 |
|
734 | return $html; |