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php超快高效率统计大文件行数

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2016-05-23 17:09:561404browse

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/*
 * 高效率计算文件行数
 * @author axiang
*/
function count_line($file){
	$fp=fopen($file, "r");
	$i=0;
	while(!feof($fp)) {
		//每次读取2M
		if($data=fread($fp,1024*1024*2)){
			//计算读取到的行数
			$num=substr_count($data,"\n");
			$i+=$num;
		}
	}
	fclose($fp);
	return $i;
}

                   

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