I tried to use fopen, but I only managed to append content to end of file. Is it possible to overwrite all contents with new content in PHP?
我尝试使用fopen,但是我只把内容附加到文件的末尾。是否可以用PHP覆盖所有内容?
3 个解决方案
#1
60
使用用file_put_contents()
file_put_contents('file.txt', 'bar');
echo file_get_contents('file.txt'); // bar
file_put_contents('file.txt', 'foo');
echo file_get_contents('file.txt'); // foo
Alternatively, if you're stuck with fopen()
you can use the w
or w+
modes:
或者,如果你被fopen()困住了,你可以使用w或w+模式:
'w' Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
“w”只供写作使用;将文件指针放置在文件的开头,并将文件截断为零长度。如果文件不存在,尝试创建它。
'w+' Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
“w+”开启阅读和写作;将文件指针放置在文件的开头,并将文件截断为零长度。如果文件不存在,尝试创建它。
#2
1
$fname = "database.php";
$fhandle = fopen($fname,"r");
$content = fread($fhandle,filesize($fname));
$content = str_replace("192.168.1.198", "localhost", $content);
$fhandle = fopen($fname,"w");
fwrite($fhandle,$content);
fclose($fhandle);
#3
1
Alternatively if you have full control of your server, why not "guarantee" the operation tweaking it around by removing the file before?
或者,如果您完全控制了服务器,为什么不“保证”通过删除之前的文件来调整操作?
$wait=exec('rm -r -f myfile.txt');
file_put_contents('myfile.txt','new content');
The $wait here is just to hold the remove command until it gets done, and make the file_put_contents safe because sometimes it only appends content, not replacing for a new one
这里的$wait只是保存remove命令,直到它完成,并使file_put_contents变得安全,因为有时它只附加内容,而不是替换新的内容
MY PREFERRED METHOD [the most effective of all] is using fopen,fwrite and fclose [it will cost less CPU and never fails]
我的首选方法[最有效的方法]是使用fopen、fwrite和fclose[它将花费更少的CPU并且不会失败]
$f=fopen('myfile.txt','w');
fwrite($f,'new content');
fclose($f);
#1
60
使用用file_put_contents()
file_put_contents('file.txt', 'bar');
echo file_get_contents('file.txt'); // bar
file_put_contents('file.txt', 'foo');
echo file_get_contents('file.txt'); // foo
Alternatively, if you're stuck with fopen()
you can use the w
or w+
modes:
或者,如果你被fopen()困住了,你可以使用w或w+模式:
'w' Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
“w”只供写作使用;将文件指针放置在文件的开头,并将文件截断为零长度。如果文件不存在,尝试创建它。
'w+' Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
“w+”开启阅读和写作;将文件指针放置在文件的开头,并将文件截断为零长度。如果文件不存在,尝试创建它。
#2
1
$fname = "database.php";
$fhandle = fopen($fname,"r");
$content = fread($fhandle,filesize($fname));
$content = str_replace("192.168.1.198", "localhost", $content);
$fhandle = fopen($fname,"w");
fwrite($fhandle,$content);
fclose($fhandle);
#3
1
Alternatively if you have full control of your server, why not "guarantee" the operation tweaking it around by removing the file before?
或者,如果您完全控制了服务器,为什么不“保证”通过删除之前的文件来调整操作?
$wait=exec('rm -r -f myfile.txt');
file_put_contents('myfile.txt','new content');
The $wait here is just to hold the remove command until it gets done, and make the file_put_contents safe because sometimes it only appends content, not replacing for a new one
这里的$wait只是保存remove命令,直到它完成,并使file_put_contents变得安全,因为有时它只附加内容,而不是替换新的内容
MY PREFERRED METHOD [the most effective of all] is using fopen,fwrite and fclose [it will cost less CPU and never fails]
我的首选方法[最有效的方法]是使用fopen、fwrite和fclose[它将花费更少的CPU并且不会失败]
$f=fopen('myfile.txt','w');
fwrite($f,'new content');
fclose($f);