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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 |
---|---|
1892 | * Returning `true` will add the default value. |
1893 | * |
1894 | * @since 5.5.0 |
1895 | * |
1896 | * @param string|bool $value The `loading` attribute value. Returning a falsey value will result in |
1897 | * the attribute being omitted for the image. |
1898 | * @param string $image The HTML `img` tag to be filtered. |
1899 | * @param string $context Additional context about how the function was called or where the img tag is. |
1900 | */ |
1901 | $value = apply_filters( 'wp_img_tag_add_loading_attr', $value, $image, $context ); |
1902 |
|
1903 | if ( $value ) { |
1904 | if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) { |
1905 | $value = 'lazy'; |
1906 | } |
1907 |
|
1908 | return str_replace( '<img', '<img loading="' . esc_attr( $value ) . '"', $image ); |
1909 | } |
1910 |
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