delete a new line from the txt file after inserting the value

I create a txt file from a folder in that way:

$fp = fopen("mylist.txt","rw+");
foreach(glob("folder/*.*") as $value){
fwrite($fp,$value."\n");
}

and it create inside the txt each items, one per line, BUT it also add a newline at the end of the file.

This is the content of mylist.txt:

foldelr/file1.mp3
folder/file2.mp3
(BLANK NEWLINE)

I tried to remove the blank newline at the end of the txt file, in this way:

$filetxt = fopen("mylist.txt","r");
$rtrim = rtrim($filetxt, "\n");
$newfile = file_put_contents("newfile.txt", $rtrim);

But it doesn't work, because in the "newfile.txt", i still have the newline blank after last file name.

I tried to convert file in array, use "array_diff()" to remove the last line, but it fail. I tried also all the suggestions in this thread: remove new line characters from txt file using php but not fix my problem.

Does anyone can please help me to understand what i'm missing or mistaken?

Kind Regards

Brus

---

Use file_get_contents method it works fine for me

    $fp = fopen("mylist.txt","rw+");
    foreach (glob("test/*.*") as $value) {
        fwrite($fp, $value . "\n");
    }

    $filetxt = file_get_contents("mylist.txt");
    $rtrim =  rtrim($filetxt, "\n");
    $newfile = file_put_contents("mylist.txt", $rtrim);

Or You can also remove the last newline by using the array count.

$fp = fopen("mylist.txt","rw+");
$i =0;
foreach(glob("folder/*.*") as $value){
  $i++;
  if($i < count(glob("folder/*.*")))
    fwrite($fp,$value."\n");
  else
    fwrite($fp,$value);
}




PHP: Requires a file called counter1.dat in the same folder as the script

Requires a file called counter1.dat in the same folder as the script
CHMOD the counter file to 755
<?php
//simple counter example v1.0
//open the counter file in read only mode
$counterfile = "counter1.dat";
if(!($fp = fopen($counterfile,"r"))) die ("cannot open counter file");
//read the value stored in the file
$thecount = (int) fread($fp, 20);
//close the file
fclose($fp);
//increment the count
$thecount++;
//display the count
echo "visitor no : $thecount";
//open the file again in write mode and store
// the new count
$fp = fopen($counterfile, "w");
fwrite($fp , $thecount);
//close the file
fclose($fp);
?>

popen in PHP

popen — Opens process file pointer
Syntax:

resource popen ( string $command , string $mode )
Opens a pipe to a process executed by forking the command given by command.

Parameters:

command
The command

mode
The mode

Return values: Returns a file pointer identical to that returned by fopen(), except that it is unidirectional (may only be used for reading or writing) and must be closed with pclose(). This pointer may be used with fgets(), fgetss(), and fwrite(). When the mode is 'r', the returned file pointer equals to the STDOUT of the command, when the mode is 'w', the returned file pointer equals to the STDIN of the command.

If an error occurs, returns FALSE.



Example #1 popen() example

<?php
$handle = popen("/bin/ls", "r");
?>
If the command to be executed could not be found, a valid resource is returned. This may seem odd, but makes sense; it allows you to access any error message returned by the shell:

Example #2 popen() example

<?php
error_reporting(E_ALL);

/* Add redirection so we can get stderr. */
$handle = popen('/path/to/executable 2>&1', 'r');
echo "'$handle'; " . gettype($handle) . "\n";
$read = fread($handle, 2096);
echo $read;
pclose($handle);
?>


Note:
If you're looking for bi-directional support (two-way), use proc_open().
Note: When safe mode is enabled, you can only execute files within the safe_mode_exec_dir. For practical reasons, it is currently not allowed to have .. components in the path to the executable.
Warning
With safe mode enabled, the command string is escaped with escapeshellcmd(). Thus, echo y | echo x becomes echo y \| echo x.

fwrite in PHP

fwrite — Binary-safe file write

Syntax:

int fwrite ( resource $handle , string $string [, int $length ] )
fwrite() writes the contents of string to the file stream pointed to by handle.

Parameters:

handle
A file system pointer resource that is typically created using fopen().

string
The string that is to be written.

length
If the length argument is given, writing will stop after length bytes have been written or the end of string is reached, whichever comes first.

Note that if the length argument is given, then the magic_quotes_runtime configuration option will be ignored and no slashes will be stripped from string.

Return values: fwrite() returns the number of bytes written, or FALSE on error.



Note:
Writing to a network stream may end before the whole string is written. Return value of fwrite() may be checked:
<?php
function fwrite_stream($fp, $string) {
    for ($written = 0; $written < strlen($string); $written += $fwrite) {
        $fwrite = fwrite($fp, substr($string, $written));
        if ($fwrite === false) {
            return $written;
        }
    }
    return $written;
}
?>
Note:
On systems which differentiate between binary and text files (i.e. Windows) the file must be opened with 'b' included in fopen() mode parameter.
Note:
If handle was fopen()ed in append mode, fwrite()s are atomic (unless the size of string exceeds the filesystem's block size, on some platforms, and as long as the file is on a local filesystem). That is, there is no need to flock() a resource before calling fwrite(); all of the data will be written without interruption.
Note:
If writing twice to the file pointer, then the data will be appended to the end of the file content:
<?php
$fp = fopen('data.txt', 'w');
fwrite($fp, '1');
fwrite($fp, '23');
fclose($fp);

// the content of 'data.txt' is now 123 and not 23!
?>


Example #1 A simple fwrite() example

<?php
$filename = 'test.txt';
$somecontent = "Add this to the file\n";

// Let's make sure the file exists and is writable first.
if (is_writable($filename)) {

    // In our example we're opening $filename in append mode.
    // The file pointer is at the bottom of the file hence
    // that's where $somecontent will go when we fwrite() it.
    if (!$handle = fopen($filename, 'a')) {
         echo "Cannot open file ($filename)";
         exit;
    }

    // Write $somecontent to our opened file.
    if (fwrite($handle, $somecontent) === FALSE) {
        echo "Cannot write to file ($filename)";
        exit;
    }

    echo "Success, wrote ($somecontent) to file ($filename)";

    fclose($handle);

} else {
    echo "The file $filename is not writable";
}
?>
fputs — Alias of fwrite
This function is an alias of: fwrite().

unlink in PHP

unlink — Deletes a file
Syntax:

bool unlink ( string $filename [, resource $context ] )
Deletes filename. Similar to the Unix C unlink() function. A E_WARNING level error will be generated on failure.

Parameters:

filename
Path to the file.

context
Note: Context support was added with PHP 5.0.0. For a description of contexts, refer to Streams.
Return values: Returns TRUE on success or FALSE on failure.

Changelog ¶

Version Description
5.0.0 As of PHP 5.0.0 unlink() can also be used with some URL wrappers. Refer to Supported Protocols and Wrappers for a listing of which wrappers support unlink().


Example #1 Basic unlink() usage

<?php
$fh = fopen('test.html', 'a');
fwrite($fh, '<h1>Hello world!</h1>');
fclose($fh);

unlink('test.html');
?>

fflush in PHP

fflush — Flushes the output to a file
Syntax:

bool fflush ( resource $handle )
This function forces a write of all buffered output to the resource pointed to by the file handle.

Parameters:

handle
The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).

Return values: Returns TRUE on success or FALSE on failure.



Example #1 File write example using fflush()

<?php
$filename = 'bar.txt';

$file = fopen($filename, 'r+');
rewind($file);
fwrite($file, 'Foo');
fflush($file);
ftruncate($file, ftell($file));
fclose($file);
?>

PHP: File functions In PHP

This chapter will explain following functions related to files:

• Opening a file
• Reading a file
• Writing a file
• Closing a file

Opening and Closing Files

The PHP fopen() function is used to open a file. It requires two arguments stating first the file name and then mode in which to operate.
Files modes can be specified as one of the six options in this table.

Mode	Purpose
r	Opens the file for reading only. Places the file pointer at the beginning of the file.
r+	Opens the file for reading and writing. Places the file pointer at the beginning of the file.
w	Opens the file for writing only. Places the file pointer at the beginning of the file. and truncates the file to zero length. If files does not exist then it attemts to create a file.
w+	Opens the file for reading and writing only. Places the file pointer at the beginning of the file. and truncates the file to zero length. If files does not exist then it attemts to create a file.
a	Opens the file for writing only. Places the file pointer at the end of the file. If files does not exist then it attemts to create a file.
a+	Opens the file for reading and writing only. Places the file pointer at the end of the file. If files does not exist then it attemts to create a file.

If an attempt to open a file fails then fopen returns a value of false otherwise it returns a file pointer which is used for further reading or writing to that file.
After making a changes to the opened file it is important to close it with the fclose() function. The fclose() function requires a file pointer as its argument and then returns true when the closure succeeds or false if it fails.

Reading a file

Once a file is opened using fopen() function it can be read with a function called fread(). This function requires two arguments. These must be the file pointer and the length of the file expressed in bytes.
The files's length can be found using the filesize() function which takes the file name as its argument and returns the size of the file expressed in bytes.
So here are the steps required to read a file with PHP.

• Open a file using fopen() function.
• Get the file's length using filesize() function.
• Read the file's content using fread() function.
• Close the file with fclose() function.

The following example assigns the content of a text file to a variable then displays those contents on the web page.

<html> <head> <title>Reading a file using PHP</title> </head> <body> <?php $filename = "/home/user/guest/tmp.txt"; $file = fopen( $filename, "r" ); if( $file == false ) { echo ( "Error in opening file" ); exit(); } $filesize = filesize( $filename ); $filetext = fread( $file, $filesize ); fclose( $file ); echo ( "File size : $filesize bytes" ); echo ( "<pre>$filetext</pre>" ); ?> </body> </html>

Writing a file

A new file can be written or text can be appended to an existing file using the PHP fwrite() function. This function requires two arguments specifying a file pointer and the string of data that is to be written. Optionally a third integer argument can be included to specify the length of the data to write. If the third argument is included, writing would will stop after the specified length has been reached.
The following example creates a new text file then writes a short text heading insite it. After closing this file its existence is confirmed using file_exist() function which takes file name as an argument

<?php $filename = "/home/user/guest/newfile.txt"; $file = fopen( $filename, "w" ); if( $file == false ) { echo ( "Error in opening new file" ); exit(); } fwrite( $file, "This is a simple test\n" ); fclose( $file ); ?> <html> <head> <title>Writing a file using PHP</title> </head> <body> <?php if( file_exist( $filename ) ) { $filesize = filesize( $filename ); $msg = "File created with name $filename "; $msg .= "containing $filesize bytes"; echo ($msg ); } else { echo ("File $filename does not exit" ); } ?> </body> </html>

We have covered all the function related to file input and out in PHP File System Function chapter.