Could you tell me if the usage of <EOF me is correct.

Could you tell me if my usage is correct.

$ Str = <
 
  
For (I = 0; I
  
   
$ Arrkey [I]
   
}
   

   

   

   

   
Fan low-level error. I should be $ I.
   
I tested it. no. Write in this way.
   
  
   
$arrkey=array(1,2,3);$i=0;$str=<<
     
 
  
    
EOF;    It seems wrong to me. it is okay to directly write variables in it, and it does not work to set statements. If not, how can we implement it flexibly. My html code is long and can only be done with EOF. it is too troublesome to splice it with php. Please give me some advice. Reply to discussion (solution)  
    
    
  
 
   
 
    
EOF; for ($ I = 0; $ I  ';} $ Str. = <  
 
Isn't the following statement quite good?
 
 
 
$arrkey=array(1,2,3);$a = join('
', $arrkey);$str=<<
            
     
       EOF; echo $ str;  
      
 
       
 
        
$
 
       
 
      
 
     
 
     
       EOF; echo $ str;