How to use custom function aliases in PHP

I want to use db_esc() instead of mysql_real_escape_string(). I dont want to call mysql_real_escape_string each time when I need a query. I can write a custom function but I want to declare a function-alias if possible.

I could use own function:

 function db_esc($str){
	return mysql_real_escape_string($str);
 }
 

I would prefer something like this:

 function_alias( 'db_esc', 'instead of mysql_real_escape_string' );
 

Any idea?

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