php - declared variable += and a new variable not containing last data of the previous variable -

example:

$variable = somecode;  $variable .= somemorecode;  $variable .= somemoremorecode;   

i want make $variable2 containing somemoremorecode;

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notes:

1) whitout rewritting somemoremorecode; part.

2) variables in function, can't declare $variable2 on code part interests me.

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q: how can achieve ?

$variable2=somemoremorecode; return $variable2; //because it's in function. 

if have interpreted question, answer. if not, please try make example , share code.