For small DBs and where I don't expect very heavy traffic, I simply put everything in an array, where the keys are unique.
Arrays are quite easy to work with for your type of application
Here is a snip I wrote recently
function write_data_file($courses_array){
$file_str= base64_encode(serialize($courses_array)); //base64 required because of special chars
$fh = fopen(DATA_FILE_FP, "wb");
if(!$fh) die("<p style=\"color:red\">Code error in update_data_file(), \"DATA_FILE\" could not be opened. Check file system.</p>");
if (flock($fh, LOCK_EX)) { // do exclusive lock
fwrite($fh, $file_str);
flock($fh, LOCK_UN); // release lock
}
else die("<p style=\"color:red\">Code error, could not lock \"DATA_FILE\". Contact tech support.</p>");
fclose($fh);
//No need to restore data dir and file to 755 and 644.
return;
}//end function
To get your array back just like it was.
function get_all_courses(){
$file_str= base64_decode(file_get_contents(DATA_FILE_FP)); //base64 required
return unserialize($file_str); //returns data array
}//end function
smr78 wrote:
Hi,
What is the best method to update a single line in a text file?
I have a file made of identifiers, that is pointed on by a htaccess file and
used by a server to give access to a web site.
The file content is like this :
login1:pass1\r\n
login2:pass2\r\n
....
loginn:passn\r\n
loginn1:passn1\r\n
....
lastlogin:lastpass\r\n
This file can be modified in three ways
update a single line when a user updates its profile
delete a single line when the webmaster makes a user inactive
append a line when the webmaster makes a user active
the difficulties are :
there is not the same number of users and lines in this file,
we dont know at which line are the identifiers of a user,
when updating identifiers, we must keep new line characters at the end.
So what are the best functions to use to read and rewrite the file?
file() which puts all the content in an array, including the new line
characters? (if so, we need to use array_search() or array_keys() to find
where are the identifiers
fread() or file_get_contents() which puts all the content in a string? I
tried this way and use eregi_replace() to find where are the identifiers,
replace them by new value. But sometimes, I get errors where the new line
characters are suppressed between two users identifiers or where an
identifier is repeated like this :
loginx:passx\r\n
loginx:passx\r\n
loginn:passnloginn1:passn1\r\n
loginn2:passn2\r\n
Here is my code :
<? php
//reading the actual file content
$length=filesize($filename);
$fp=fopen($filename,"r");
$str=fread($fp,$length);
fclose($fp);
//in case of updating
$str=eregi_replace($oldlogin.":".$oldpass,$newlogin.":".$newpass,$str);
//in case of deleting
$str=eregi_replace($oldlogin.":".$oldpass,"",$str);
//rewriting the file
$handle = fopen($filename,"w+")
fwrite($handle,$str,strlen($str))
//in case of inserting a new user
$str=$newlogin.":".$newpass."\r\n";
$handle = fopen($filename,"a")
fwrite($handle,$str,strlen($str))
?>
I know in "deleting" case, the eregi_replace pattern is so that the new line
characters will not be removed, but this is not a problem
I'll try to use file() function and array_keys() and let you know.
Thanks
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