Using define () function<\/h2>\n

\n
• In PHP use the define () function to create a constant and it defines constant at run time.<\/li>\n
• In this function name specifies the constant name, value specifies the constant value and case-insensitive specifies whether a constant is case-insensitive.<\/li>\n
• By default, if value is false it means it is case sensitive.<\/li>\n<\/ul>\n

  Sample Code<\/h3>\n

  <\/div>

  <?php    define("MESSAGE","Welcome to Wikitechy",true);\/\/not case sensitive    echo MESSAGE, "<\/br>";    echo message;    ?>    <\/code><\/pre> <\/div>\n
  Output<\/h3>\n
  <\/p>\n
  Using const Keyword<\/h2>\n
  \n
  PHP introduces a const keyword to create a constant and it defines constants at compile time.<\/li>\n
  It constructs a language, not a function.<\/li>\n
  The constant defined using const keyword are\u00a0case-sensitive<\/strong>.<\/li>\n<\/ul>\n
  Sample Code<\/h3>\n
   
   <\/div> 
  <?php          define("MSG", "Wikitechy");      echo MSG, "<\/br>";      echo constant("MSG");      \/\/both are similar  ?>  <\/code><\/pre> <\/div>\n
  Output<\/h3>\n
  <\/p>\n","protected":false},"excerpt":{"rendered":"
  PHP constants are identifier or name that can’t be changed during the execution of the script except for magic constants, which are not really constants. Constants can never be undefined or changed, they are similar to the variable except once defined. PHP constants follow the same PHP variable rules and it remains constant across the […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"passster_activate_protection":false,"passster_protect_child_pages":"","passster_protection_type":"password","passster_password":"","passster_activate_overwrite_defaults":"","passster_headline":"","passster_instruction":"","passster_placeholder":"","passster_button":"","passster_id":"","passster_activate_misc_settings":"","passster_redirect_url":"","passster_hide":"no","passster_area_shortcode":"","gtb_hide_title":false,"gtb_wrap_title":false,"gtb_class_title":"","gtb_remove_headerfooter":false,"footnotes":""},"categories":[8182],"tags":[17739,17740,17664,17745,17737,17742,17741,17738,17743,17744],"class_list":["post-4564","post","type-post","status-publish","format-standard","hentry","category-php","tag-how-to-define-constants-in-php","tag-how-to-use-constants-in-php","tag-magic-constants-in-php","tag-php-constant-case-insensitive","tag-php-constants","tag-php-constants-array","tag-php-constants-in-class","tag-php-constants-types","tag-php-protected-static-const","tag-php-unset-constant"],"yoast_head":"\n