在其他函数可访问的函数内部创建变量？

inside of a function i have a $connection var what obviously stores my connection to mysql, how can i call that var from inside other functions to save me having to paste the $connection var inside of every function that requires this var?

i have tried global to no avail.

many thanks

You could use the old global keyword.

function a() {
   global $connection;
}

Or you could throw it in $GLOBALS (this will help you get it out of the function defined it in).

Neither of them are too pretty.

Or you could pass in the $connection as an argument.

The most common way of dealing with a database connection is to have its creation handled by a singleton pattern, or have a base class with OO that has a $this->db available, that all your other classes can inherit from.

Pass the connection as a parameter to the functions that need it. It keeps your code clean and re-usable.

Another solution would be to use a class and make the connection a class variable. You will just use $this->connection every time you need this, but this is not really a solution if you already have a lot of code written in a lot of files.

Declare the variable outside the function, then make it accessible inside each function you need it by using the global keyword.

$globalName = "Zoe";

function sayHello() {
  $localName = "Harry";
  echo "Hello, $localName!";

  global $globalName;
  echo "Hello, $globalName!";
}

sayHello();

stolen from http://www.elated.com/articles/php-variable-scope-all-you-need-to-know/