When we add a global variable to the dream, we can call it in the template, such as {dede:global.cfg_cmsurl/} current Web site URL, these are defined global variables, we can also add our own defined global variables, such as phone number
You need to add an identifier when you define it, and you can add a global variable in the system-"system basic Parameters-" to add a new variable.
For example, the variable name fills "Cfg_lxdh", the variable Value "15012345678", the parameter description is "telephone number", then we can write {dede:global.cfg_lxdh/} when calling the phone number in the template.
Here's what happens when you modify this value, which is usually/data/ config.cache.inc.php cause, because the background fill in the value is stored in the database, and then write this file to introduce to each page, so, we will find, sometimes, obviously the database has been modified, but the value of the page does not change, this is, this file permissions are not enough, can not be modified caused.
DEDECMS Global configuration variable cache