php - Concatenate 2 vars simultaniously -

simplified problem.

$var1 should "1245"

$var2 should "1345"

the aim when assigning common values ("1","4","5") - need assign once.

$var1=""; $var2="";  $var1.="1"; //need same content $var2 $var1.="2"; //this var1 $var2.="3"; //this var2 $var1.="4"; //need same content $var2 $var1.="5"; //need same content $var2 

this not looking for:

$var1=""; $var2="";  $var1.="1"; $var1.="2"; $var1.="4"; $var1.="5";  $var2.="1"; $var2.="3"; $var2.="4"; $var2.="5"; 

because want following assignments appear once in code:

.="1"; .="4"; .="5"; 

i hope explicit.

edit: tried this:

$var1=""; $var2=""; $var2.=$var1.="1"; $var1.="2"; $var2.="3"; $var2.=$var1.="4"; $var2.=$var1.="5";  //$var1=>1245 //$var2=>131241245   $var1=""; $var2=""; $var1.=$var2.="1"; $var1.="2"; $var2.="3"; $var1.=$var2.="4"; $var1.=$var2.="5";  //$var1=>121341345 //$var2=>1345 

use this:

$var1 = $var2 = "1245"; $var2[1] = "3"; 

or:

$var1 = $var2 = '1'; $var1 = $var2 .= '2'; $var1 = $var2 .= '4'; $var1 = $var2 .= '5'; $var2[1] = '3';