Text file Read – Create – Save write/delete fopen

19th July 2013

Php - Strings

Read text file


<?php
$myfile = fopen("webdictionary.txt", "r") or die("Unable to open file!");
echo fread($myfile,filesize("webdictionary.txt"));
fclose($myfile);
?>

<?php

$myfile = fopen("webdictionary.txt", "r") or die("Unable to open file!");

echo fread($myfile,filesize("webdictionary.txt"));

fclose($myfile);

Create a text file and add 122 to the file and save it


$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$txt = "122";
fwrite($myfile, $txt);
fclose($myfile);

$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");

$txt = "122";

fwrite($myfile, $txt);

fclose($myfile);

Basic write to text file


$myname = "This will be added to text file";
$handle = fopen('mytextfile.php','a+');
    fwrite ($handle,$myname);
    fclose($handle);
echo "Text file written";

$myname = "This will be added to text file";

$handle = fopen('mytextfile.php','a+');

fwrite ($handle,$myname);

fclose($handle);

echo "Text file written";

New file name

Creates a new file with the milliseconds time (Filenumber-1232233223.txt)


$date_to_add=substr(microtime(true) * 1000, 0, 13);
$handle = fopen('C:\Projects\dev\Filenumber-'.$date_to_add.'.txt','a');
    fwrite ($handle,$writethis);
    fclose($handle);

$date_to_add=substr(microtime(true) * 1000, 0, 13);

$handle = fopen('C:\Projects\dev\Filenumber-'.$date_to_add.'.txt','a');

fwrite ($handle,$writethis);

fclose($handle);

When run, this creates a text file (you may need permissions to write), the ‘a’ stands for append and will add a new line every time to the file.


<?php
$myname = "drax";
$date_to_add_to_txt=date("d-m-Y H:i:s");
$handle = fopen('mynewfile.txt','a');
	fwrite ($handle,$date_to_add_to_txt." - ".$myname."rn");
	fclose($handle);
echo "Text file written";
?>

<?php

$myname = "drax";

$date_to_add_to_txt=date("d-m-Y H:i:s");

$handle = fopen('mynewfile.txt','a');

fwrite ($handle,$date_to_add_to_txt." - ".$myname."rn");

fclose($handle);

echo "Text file written";

Write to specific line


<?php

$file = 'test1.txt';
$line_looking = 4;

$lines = file($file, FILE_IGNORE_NEW_LINES);
$lines[$line_looking] = 'Codehavens great!';
file_put_contents($file, implode("\n", $lines));
?>

<?php

$file = 'test1.txt';

$line_looking = 4;

$lines = file($file, FILE_IGNORE_NEW_LINES);

$lines[$line_looking] = 'Codehavens great!';

file_put_contents($file, implode("\n", $lines));

Delete Text file


$filetodelete = "testFile.txt";
unlink($filetodelete);

$filetodelete = "testFile.txt";

unlink($filetodelete);

Delete all files in folder


$files = glob('path/to/temp/*'); // get all file names
foreach($files as $file){ // iterate files
  if(is_file($file))
    unlink($file); // delete file
}

$files = glob('path/to/temp/*'); // get all file names

foreach($files as $file){ // iterate files

if(is_file($file))

unlink($file); // delete file

}

Rename file


$old = '/tmp/today.txt';
$new = '/tmp/tomorrow.txt';
rename($old, $new) or die("Unable to rename $old to $new.");

$old = '/tmp/today.txt';

$new = '/tmp/tomorrow.txt';

rename($old, $new) or die("Unable to rename $old to $new.");

Copy file


$old = '/tmp/yesterday.txt';
$new = '/tmp/today.txt';
copy($old, $new) or die("Unable to copy $old to $new.");

$old = '/tmp/yesterday.txt';

$new = '/tmp/today.txt';

copy($old, $new) or die("Unable to copy $old to $new.");

“r” (Read only. Starts at the beginning of the file)
“r+” (Read/Write. Starts at the beginning of the file)
“w” (Write only. Opens and clears the contents of file; or creates a new file if it doesn’t exist)
“w+” (Read/Write. Opens and clears the contents of file; or creates a new file if it doesn’t exist)
“a” (Write only. Opens and writes to the end of the file or creates a new file if it doesn’t exist)
“a+” (Read/Write. Preserves file content by writing to the end of the file)
“x” (Write only. Creates a new file. Returns FALSE and an error if file already exists)
“x+” (Read/Write. Creates a new file. Returns FALSE and an error if file already exists)