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Энштеин, очипятку видишь?
function updateFile(){
$result = '';
foreach ($this->arr as $sname=>$section){
$result .= '[' . $sname . ']' . _BR_;
foreach ($section as $key=>$value){
$result .= $key .'='.$value . _BR_;
}
$result .= _BR_;
}
file_p_contents($this->filename, $result);
return true;
}