This function will return the width (in pixels) of the input string. It is very handy for calculating distances between text elements based on the total width of the letters that make up the string as it would be drawn with draw_text using the currently defined font.
Argument Description string The string to measure the width of.
ww = string_width(str_Name + " ");
draw_text(32, 32, str_Name));
draw_text(32 + ww, 32, "has won the game!");
The above code will get the width of the given string and then draw two lines of text, using the returned string width as a separator.