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Enqueueing IE conditional stylesheets in WordPress the right way
<?php
add_action( 'wp_enqueue_scripts', 'enqueue_my_styles' );
function enqueue_my_styles() {
global $wp_styles;
// Load the main stylesheet
wp_enqueue_style( 'my-theme', get_stylesheet_uri() );
/**
* Load our IE-only stylesheet for all versions of IE:
* <!--[if IE]> ... <![endif]-->
*
* NOTE: It is also possible to just check and see if the $is_IE global in WordPress is set to true before
* calling the wp_enqueue_style() function. If you are trying to load a stylesheet for all browsers
* EXCEPT for IE, then you would HAVE to check the $is_IE global since WordPress doesn't have a way to
* properly handle non-IE conditional comments.
*/
wp_enqueue_style( 'my-theme-ie', get_stylesheet_directory_uri() . "/css/ie.css", array( 'my-theme' ) );
$wp_styles->add_data( 'my-theme-ie', 'conditional', 'IE' );
/**
* Load our IE version-specific stylesheet:
* <!--[if IE 7]> ... <![endif]-->
*/
wp_enqueue_style( 'my-theme-ie7', get_stylesheet_directory_uri() . "/css/ie7.css", array( 'my-theme' ) );
$wp_styles->add_data( 'my-theme-ie7', 'conditional', 'IE 7' );
/**
* Load our IE specific stylesheet for a range of older versions:
* <!--[if lt IE 9]> ... <![endif]-->
* <!--[if lte IE 8]> ... <![endif]-->
* NOTE: You can use the 'less than' or the 'less than or equal to' syntax here interchangeably.
*/
wp_enqueue_style( 'my-theme-old-ie', get_stylesheet_directory_uri() . "/css/old-ie.css", array( 'my-theme' ) );
$wp_styles->add_data( 'my-theme-old-ie', 'conditional', 'lt IE 9' );
/**
* Load our IE specific stylesheet for a range of newer versions:
* <!--[if gt IE 8]> ... <![endif]-->
* <!--[if gte IE 9]> ... <![endif]-->
* NOTE: You can use the 'greater than' or the 'greater than or equal to' syntax here interchangeably.
*/
wp_enqueue_style( 'my-theme-new-ie', get_stylesheet_directory_uri() . "/css/new-ie.css", array( 'my-theme' ) );
$wp_styles->add_data( 'my-theme-new-ie', 'conditional', 'gt IE 8' );
}
@andrewtanner1987

Works like a charm, cheers!

@kabdessamad1

😄 thnx

@bryanwillis

This needs to be updated - see this stackoverflow question for more details regarding this gist. You don't need to be accessing globals when there's wp_styles. There's a also a shortcut wp_style_add_data for wp_styles. This applies to wp_scripts as well which uses wp_script_add_data.

add_action( 'wp_enqueue_scripts', 'enqueue_my_styles_and_scripts' );
/**
 * Enqueue styles and scripts conditionally.
 *
 * Load stylesheets and scripts specifically for IE. IE10 and above does
 * not support conditional comments in standards mode.
 *
 * @link https://msdn.microsoft.com/en-us/library/ms537512(v=vs.85).aspx
 */
function enqueue_my_styles_and_scripts() {

    // Internet Explorer specific stylesheet.
    wp_enqueue_style( 'themename-ie', get_stylesheet_directory_uri() . '/css/ie.css', array( 'twentyfifteen-style' ), '20141010' );
    wp_style_add_data( 'themename-ie', 'conditional', 'lte IE 9' );

    // Internet Explorer 7 specific stylesheet.
    wp_enqueue_style( 'themename-ie7', get_stylesheet_directory_uri() . '/css/ie7.css', array( 'twentyfifteen-style' ), '20141010' );
    wp_style_add_data( 'themename-ie7', 'conditional', 'lt IE 8' );

     // Internet Explorer HTML5 support 
    wp_enqueue_script( 'html5shiv',get_template_directory_uri().'/js/html5shiv.js', array(), '3.7.3', false);
    wp_script_add_data( 'html5shiv', 'conditional', 'lt IE 9' );

    // Internet Explorer 8 media query support
    wp_enqueue_script( 'respond', get_template_directory_uri().'/js/respond.js', array(), '1.4.2', false);
    wp_script_add_data( 'respond', 'conditional', 'lt IE 9' );

}

Also, for the most part you shouldn't be using $is_IE ( thanks toscho ). If you don't send the HTTP header Vary: User-Agent now, you will send the wrong output to users behind a cache. So basically the cache will break for those users.

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