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**darksun84** · 11-25-2016 02:46 AM

Simple Example:

PHP Code:

[ITEMDEF i_monster_counter]
ID = i_crystal_green
NAME= Monster counter
type = t_script

ON=@Create
color = colors_all

ON=@Dclick
src.sysmessage @100 You have killed <dtag0.monsterKill> monsters.
return 1

[EVENTS e_monster_kill]
ON=@Kill
ref1 = <findid.i_monster_counter>
if (<ref1>)
      ref1.tag0.monsterKill += 1
      sysmessage @100 Your monster counter is increased, is now <ref1.dtag0.monsterKill>
      return 0
endif
//This will install the e_monster_kill event on the player.
//For removing the event type .events -e_monster_kill.
[FUNCTION testMonster]
events +e_monster_kill
src.sysmessage @100 Monster kill event installed. 

In some line of code:

PHP Code:

sysmessage @100 Your monster counter is increased, is now <ref1.dtag0.monsterKill> 

I add the prefix d before the tag, that means display the result in decimal (instead of hexdecimal), it's a shortcut for avoiding writing <eval <ref1.tag0.monsterKill>>

Difference betweeen TAG,TAG0:
TAG0 just tell Sphere to set to 0 the value of the TAG when the TAG is accessed AND the TAG doesn't have any value.
Example:

PHP Code:

[function testApples]
sysmessage  I have <tag0.apples> apples. //Output will be: I have 0 apples.
sysmessage I have <tag.apples> apples.  //Output will be: I have apples.   
tag.apples = 2
sysmessage  I have <tag0.apples> apples. //Output will be: I have 02 apples.
sysmessage I have <tag.apples> apples.  //Output will be: I have 02 apples. 
//The following line will clear the tag.
tag.apples = 

It's important to use TAG0 when checking the tag value.

PHP Code:

[FUNCTION checkApples]
//This will throw an error in the console if the tag is empty.
//By using tag0 you can avoid the error.
if <tag.apples> > 1
    say I have at least an apple.
else
    say I have no apples.
endif 

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