I do not know much about how $[‘globals’] decides what browser you are using, i assume it uses some kind of browser sniffing which is generally a bad technique as the results it produces can be less than reliable.
Why do you need to use PHP anyway, just putting this as HTML in the head will achieve exactly the same effect.
<!--[if lt IE 9]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
Related Posts:
- wp_head hook by page ID [closed]
- What is the condition to check if we are in admin or frontend?
- Actions, functions and conditionals
- if (is_page(**PAGE ID**)) not working
- how to check if front page is set to show a static page
- How can we use conditional tags in plugins?
- Conditional tag for all categories of a custom post type
- Possible to use conditionals within add_feed() callback?
- is_home() vs is_archive()
- Adding Controls to Theme Customizer If Certain Page Template is Active
- Problem with “conditional tag”: if empty
- Do I need to include ‘else’ and/or ‘endif’?
- is_singular() equivalent for backend
- Filter out some plugin action in wp head / wp_footer
- Make specific tag visible only to logged in users in front-end
- How can i know when i can execute what functions of wordpress?
- How can I achieve something like has_post_format( ‘standard’ )?
- Post tags show outside loop?
- WordPress conditionals not working
- Cannot Use is_single() and is_admin in functions.php
- Hide a template part when page is password protected?
- Limit Contact Form 7 hook to specific form [closed]
- Conditional tags inside a class
- Display Footer Shortcode Different for Logged In Users
- Use slug rather than id for $post->post_parent?
- If (category / tag checked) then (display header2php)
- If Parent or Current Page Is, Then Statement?
- Identify a Woocommerce page by WordPress conditional tags
- is_page conditional question
- A simple method for disabling WPML language switcher when meeting specific circumstances [closed]
- Loading template parts conditionally in Customizer
- Conditional check for embedded video in the_content
- Conditional IF statement not returning true even though echo of $user->province is correct
- is_front_page not working at all in any of the themes .php files
- is singular and is home not working
- add styles if custom header was included
- PHP if statement printing the if parameters
- Why is this is_page conditional not working?
- If page displays posts conditional
- Conditional tags not working
- Sub-category single post styling?
- How to apply a function if conditon a & b [closed]
- do code if current url = value
- Why might conditionals not work on a page?
- Conditionals: What is wrong with my if/else statements? [closed]
- Only on single post page
- Is there any way to assign stylesheets to whole sets of pages using is_page( )
- How to display a feature only if custom field value is set?
- Filter for the Custom Post List Page
- Additional conditions tags to work
- Gravity Forms, multiple conditions in shortcode
- Can this code be concatenated?
- Conditonal tag or work around to identify page number of pagnation
- Conditional: current user updated post in the last X days
- How can I get $pagenow equals to the Home Page or specific page on my site?
- page single conditional
- How to use the conditional homepage tag
- Which is the right order of the conditional tags on pages?
- Hide breadcrumbs on specific pages
- Pre Get Posts – Difference between conditional() and $query->conditional()?
- If less than IE9 [closed]
- Else statement not triggering after a failed if statement
- Function to echo (or display?) wordpress tags in the head section
- Custom Function for Portfolio Archive Template With Conditonal Tag
- Conditional Custom Image Header
- Trying to place shortcode/css/html into an IF conditional statement
- Conditional Tag Based on Age of Post [duplicate]
- conditional statement for profile pages
- Conditional single.php statement not recognizing conditionals
- WP newbie: using else/if statements to show multiple headers. bonks
- Conditional Tags and Echo HTML / divs or CSS and Display: none?
- Getting false for is_home() on Posts page
- Automatically insert H2 on h2 tags on WordPress post
- Get value in TCPDF
- Content visibility condition based on date
- Add an identifier to a set of pages to access using a conditional tag
- How to target a search result page?
- Why is_page() returns false when visiting the static page declared as “posts page”
- What changes are needed for this conditional code to work on deeper levels?
- How to detect if bbPress forum index
- Conditional tags returning different results for different areas on a page?
- Displaying message if no posts in tag
- PHP inside echo HTML?
- Conditional statements in wordpress themes
- My Conditional Tags not Working
- Help with if else statement for separating content from image attachment
- Hide page header on both index and author pages [closed]
- Run a php function if a predefined page is visited
- Targeting all pages except top level pages
- nested conditional to check for feature image and custom field?
- Help with adding conditional title tags to header.php
- How to apply style to the body tag of a particular page?
- Custom Headers on Blog Posts Page
- Conditional statement with three condition
- if is_page(‘slug’)
- How do I combine these two conditionals? [closed]
- problem with not displaying content on selected pages
- hide block of code from showing on certain pages
- Delete backgound for ID with conditional if statement
- Quick Conditional Tag Question if elseif [closed]