使用php（读/写）打开.txt文件并删除旧内容并将其替换为新内容

Question

I want to change the old values of a text file with a new values (delete the old content and replace it), when I use the code below it shows me an error page , don't really know how to fix this , even used the different types of file opening methods (w , r+ , a ...) and didn't work !

$i=$_POST['id'];
$fp = fopen ("/test/member_dl.txt", "r+");  
$ch = fgets ($fp);

$t=explode('||',$ch);
$t[$i-1]='';
$ch2=implode('||',$t);
fwrite($fp,$ch2);
fclose ($fp);

Answer 1

Whilst it's open as $fp = fopen ("/test/member_dl.txt", "r+");

You will not be able to fwrite($fp,$ch2);

Opening it with 'w+' should enable read and writing.

Try this:

$i=$_POST['id'];
$fp = fopen("/test/member_dl.txt", "w+");
$ch = fread($fp, filesize($fp));

$t=explode('||',$ch);
$t[$i-1]='';
$ch2=implode('||',$t);
fwrite($fp,$ch2);
fclose ($fp);

EDIT:

Tested this, this works

$ch = file_get_contents("test.txt");

$t=explode('||',$ch);
$t[$i-1]='';
$ch2=implode('||',$t);

file_put_contents("test.txt","hello");