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function getLine($file, $line, $length = 40960){
$returnTxt = null; // 初始化返回
$i = 1; // 行数
$handle = @fopen($file, "r");
if ($handle) {
while (!feof($handle)) {
$buffer = fgets($handle, $length);
if($line == $i) $returnTxt = $buffer;
$i++;
}
fclose($handle);
}
return $returnTxt;
}