php - $mysql_ disspearing? -

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Hi I am an installer coding, somehow ... ive ran into trouble when it creates the .. global.php file Is $ Mysql_ not visible in the connection file, while everything else does?

I am trying to include it 

  $ mysql_host = 'localhost'; $ Mysql_user = 'root'; $ Mysql_name = '-----'; $ Mysql_pass = '-----';   
 It comes out in global.php:  
  = 'localhost'; = 'Root'; = '-----'; = '-----';   
 Notice $ mysql_ incorrect?  
 This is the code in the installer:  
  $ db_name = trim ($ _ POST ['db_name']); $ Db_user = trim ($ _ POST ['db_user']); $ Db_pass = trim ($ _ POST ['db_pass']); $ Db_host = trim ($ _ POST ['db_host']); $ Handle = fopen ($ setting ['config'] ['folder']. $ Setting ['config'] ['file'], 'w'); $ Input = "& lt ;? Php $ mysql_host = ''. $ Db_host. '' $ Mysql_user = ''. $ Db_user. '' $ Mysql_name = ''. $ Db_name. '' $ Mysql_pass = '". $ Db_pass "';? & Gt;"; FILIT ($ handle, $ input); Fclose ($ handle);   
 Can anyone help?  
 
  \ $ Mysql_user = '$ db_user'; \ $ mysql_name = '$ db_name'; $ $ mysql_pass = '$ db_pass';? & Gt; ";   
 In double quoted strings, like $ sign concatenation, if you want to insert a dollar sign in the string, then you have to save it from  \  backslash.

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