Variables declared in header not available in other includes

You need to globalize it before you set the value, so in your header.php

global $myBool;
$myBool = false;

and then in your page.php

global $myBool;
echo $myBool;

just make sure you page.php includes the header.php file either directly or by calling get_header();

Related Posts:

  1. How to add elements to an empty array in PHP?
  2. Where to get information about array fields in $_REQUEST?
  3. Pass a PHP variable to another file
  4. How to store the_title() into a variable to reutrn the value, not just echo it
  5. How do I make my function add variables/values to the $post object?
  6. Cleanest/Fastest way to avoid calling and retrieving data from the database multiple times?
  7. where to include a php file
  8. How do I know what variables are passed in a filter/action and what their meaning is?
  9. When would you use $_post instead of $post?
  10. Locating Global Variables
  11. Pass PHP variable to JavaScript without inline JS
  12. Count the number of times the search form template gets included on a page
  13. Putting PHP variables into javascript [duplicate]
  14. Variable global scope [closed]
  15. How to rewrite URL with PHP variables with htaccess to a normal looking URL?
  16. Using a variable in is_page(array())
  17. Static variable and add_rewrite_rule?
  18. How to put a variable in a instance in the widget
  19. Call global variable array() in woocommerce child/template
  20. get_term_link() returns correct – But illogical error-messages disturb
  21. How can I Add a variable PHP in the Menu Nav
  22. Pass variable from one function to another
  23. Get value from shortcode to do something
  24. PHP, Creating a dynamic variable
  25. How to modify a global variable in a function and use it on another function?
  26. Variable not staying set
  27. WordPress function and string as variable?
  28. Create a WordPress shortcode using PHP [duplicate]
  29. How to pass a PHP $_GET variable and fetch/output it?
  30. Creating WordPress Shortcode with Variable
  31. How to put a form with php code into a variable or shortcode?
  32. Apply class to every third list item? [duplicate]
  33. persist a variable set in header.php all the way down to footer.php
  34. Get access to variable from previous pageview, excluding ajax-calls
  35. How to deal with too many $_POST variable conditions from ajax request at backend? [closed]
  36. What is the alternative code to if (isset ($_POST) && !empty ($_POST) to avoid warnings?
  37. How to pass a variable to get_template_part that’s updated every time the template part is called?
  38. Insert page content into another page with a changed variable
  39. Pass Variables or Variable Place-Holder from Editor to PHP
  40. How to access or parse key/values that have “string”
  41. How Do I Find & Remove H1 From Site-Title-Wrapper? [closed]
  42. Changing the order of custom fields in the dashboard for Woocommerce variable products [closed]
  43. javascript variable to wordpress php variable
  44. How to reference PHP in Javascript
  45. Store and Change Session variable – PHP SESSION VARIABLE
  46. Overide Variable in Child Theme
  47. echo var into wp_query
  48. how can I include some custom variable from functions.php?
  49. Dynamically adding filters
  50. PHP variables in a post?
  51. WordPress is removing query variables like page, p from the URL of a custom static page
  52. How to send a php var to jQuery Ajax call with two different file
  53. Unable to display multiple parameters from url by javascript through shortcodes
  54. How to check a variable Changes
  55. global $product is empty string when passed into function
  56. Can’t pass var from php wp_ajax into ajax script : result undefined or null
  57. Custom global variable not working in function
  58. WordPress How do I pass a variable from one add_action to another?
  59. Best way to use variables in multiple functions?
  60. Trying to add some custom text into WordPress Post title via function.php
  61. Reduce Stock Based on Custom Variation Field Rather than Attribute (Working Script)
  62. How do I fix Undefined variable using $_POST in function?
  63. How to change the value of a variable using input field?
  64. How to find php variable of wordpress theme settings
  65. Add class to all meta boxes for a custom post type
  66. Passing parameter from the current URL to redirect to another url
  67. Undefined variable & issue with smof_data
  68. Pulling a variable into the wp_nav_menu function
  69. Where can I find the declaration of `$_wp_theme_features`?
  70. Child theme functions.php file change database entries
  71. Custom Taxonomy Link Text Echo Name Not Slug
  72. how to add number value in front for variable [closed]
  73. Create and update Custom Cookie based on multiple GET and POST Values for first time visitors?
  74. Difference in Get Variable Location
  75. If I define a variable in header.php, how do I make it available to templates?
  76. Shortcode not passing variable to included file
  77. ACF allow zero as a value
  78. Can’t get options with $data[‘variable’]
  79. PHP Use Declared array Variable inside already Declared Array
  80. Import and use a variable in additional settings of Contact Form 7 [closed]
  81. Use ajax response in PHP function
  82. WP query with variables gives no result for specific user
  83. How can one use variables in a template or template part without polluting the global scope?
  84. How to Add Image to WordPress RSS-Feed with no Plug-in?
  85. How to execute a simple php script in WP (I don’t think wp_enque_script applies here)
  86. Delete a WordPress transient from a shortcode on Page/Post update
  87. Is sanitize_title_with_dashes formatting function too liberal (in terms of accepted characters)?
  88. wp_trim_words() does not work with my code Am I doing any mistake in my code?
  89. Warning: in_array() null given in PHP function
  90. Environment to do updates to legacy (4.7) version of WP while staying on php 5.6?
  91. WordPress add custom search
  92. Infinite loop when logging out using custom login form
  93. add custom metabox to media library custom widget
  94. add_action in wp_head accessible from class
  95. Let user select the number of posts shown per page jquery error
  96. Can’t make product images clickable
  97. wordpress ajax return 0
  98. Admin bar nodes
  99. What is the wrong with this function to enqueue the scripts and styles to the theme? [closed]
  100. ‘This Field is Required.’ is Not Displaying on CF7 [closed]

Leave a Comment

tech