PHP处理文件内容

[tata8188]

我要的效果很简单，就是打开一个文件（格式自定），把这个文件的第N行的一张图片链接（以http://p7.game.com/pic.png为例）替换成相对路径（../images/pic.png），不可以把内容写入到新的文件里面，

[tata8188]

高手啊，大神们在哪里啊？

[xuzuning]

$fn = 'filename';
$fp = fopen($fn, 'r+');
$size = filesize($fn);
$offs = 0;
$n = 0;
while($buf = fgets($fp)) {
  $n++;
  if($n == N) break;
  $offs = ftell($fp);
}
$thru = fread(fp, $size);
$buf = '..' . substr($buf, 6);
fseek($fp, $offs);
fwrite($fp, "$buf\n$tfrh");
ftruncate($fp);
fclose($fp);

[傲雪星枫]

test.txt

11111111
2222222
33333333
44444444
55555555
66666666
77777http://p7.game.com/pic.png777
888888888
99999999999

$line = 7;
$search = 'http://p7.game.com/pic.png';
$replace = '../images/pic.png';

$content = file_get_contents('test.txt');
$data = explode(chr(10), $content);

if(isset($data[$line-1])){
    $data[$line-1] = str_replace($search, $replace, $data[$line-1]);
    file_put_contents('test.txt', implode(chr(10), $data));
}

[tata8188]

引用 3 楼 fdipzone 的回复:

test.txt

11111111
2222222
33333333
44444444
55555555
66666666
77777http://p7.game.com/pic.png777
888888888
99999999999

$line = 7;
$search = 'http://p7.game.com/pic.png';
$replace = '../images/pic.png';

$content = file_get_contents('test.txt');
$data = explode(chr(10), $content);

if(isset($data[$line-1])){
    $data[$line-1] = str_replace($search, $replace, $data[$line-1]);
    file_put_contents('test.txt', implode(chr(10), $data));
}

写得很好，但是可扩展性不强，假如对多个对象进行替换处理，效果就不好了，不过，谢谢你

[tata8188]

引用 2 楼 xuzuning 的回复:

$fn = 'filename';
$fp = fopen($fn, 'r+');
$size = filesize($fn);
$offs = 0;
$n = 0;
while($buf = fgets($fp)) {
  $n++;
  if($n == N) break;
  $offs = ftell($fp);
}
$thru = fread(fp, $size);
$buf = '..' . substr($buf, 6);
fseek($fp, $offs);
fwrite($fp, "$buf\n$tfrh");
ftruncate($fp);
fclose($fp);

大神，这句是什么意思，N表示什么？“$n == N”

[xuzuning]

这个文件的第N行

[傲雪星枫]

這樣可以替換多個了。

$p = array(
	array('line'=>7,'search'=>'http://p7.game.com/pic.png','replace'=>'../images/pic.png'),
	array('line'=>8,'search'=>'8','replace'=>'abc'),
);
 
$content = file_get_contents('test.txt');
$data = explode(chr(10), $content);

foreach($p as $v){
	$key = $v['line']-1;
	if(isset($data[$key])){
		$data[$key] = str_replace($v['search'], $v['replace'], $data[$key]);
	}
}

file_put_contents('test.txt', implode(chr(10), $data));