php处理文件的思考(去除空行、每行多余字符)

1.去除空行

<?php

$str = file_get_contents('a.txt');

$str = explode(PHP_EOL, $str);    //分割为数组，每行为一个数组元素

$str = array_filter($str);    //去除数组中的空元素

$str = implode(PHP_EOL,$str);    //用换行符连结数组为字符串

file_put_contents('b.txt',$str);

 

2.去除每行多余字符
方式一，数组处理

<?php

$str = file_get_contents('a.txt');

$arr = explode(PHP_EOL,$str);

$result = array();

foreach($arr as $v)

{

    $result[] = trim(substr($v,6));

}

$result = array_filter($result);

$text = '';

foreach($result as $v)

{

    $text .= $v.PHP_EOL;

}

file_put_contents('b.txt',$text);

?>

方式二，正则直接替换

<?php

$str = file_get_contents('a.txt');

$result = preg_replace('/\d+\.\s+/','',$str);
file_put_contents('c.txt',$result);

?>