Single or several lines from txt file

[Mindaugas]

Hello, sorry if this kind of thread already exists, i couldn`t find it.

 

For example there is file with lines:

 

message1

message2

message3

message4

 

and i want to echo only 3rd line, or only 1,2,3 lines, how to do this?

[JAY6390]

use fopen and fgets

[ram4nd]

"read line from file php" to google

[PFMaBiSmAd]

The answer depends on if the maximum size of the file can grow so that it will not entirely fit in available memory at one time?

[PFMaBiSmAd]

And assuming the file will always fit into memory, try this simple solution -

 

<?php
$the_file = 'text.dat'; // what file to read
$lines = file($the_file); // read the file into an array

// example 1
$find_these = array(1); // the line(s) you want
foreach($find_these as $key){
$index = $key -1; // adjust to match actual index values (start at zero)
echo "Line: $key, $lines[$index]<br />";
}

// example 2
$find_these = array(1,2,3); // the line(s) you want
foreach($find_these as $key){
$index = $key -1; // adjust to match actual index values (start at zero)
echo "Line: $key, $lines[$index]<br />";
}
?>

[Mindaugas]

And assuming the file will always fit into memory, try this simple solution -

 

<?php
$the_file = 'text.dat'; // what file to read
$lines = file($the_file); // read the file into an array

// example 1
$find_these = array(1); // the line(s) you want
foreach($find_these as $key){
$index = $key -1; // adjust to match actual index values (start at zero)
echo "Line: $key, $lines[$index]<br />";
}

// example 2
$find_these = array(1,2,3); // the line(s) you want
foreach($find_these as $key){
$index = $key -1; // adjust to match actual index values (start at zero)
echo "Line: $key, $lines[$index]<br />";
}
?>

 

Thx it`s working perfectly

why txt file is .dat not .txt ?

[PFMaBiSmAd]

why txt file is .dat not .txt ?

 

Because it is just an example of how to do something and it is expected that it may need to be adapted it to fit any specific use you may have.

[Mindaugas]

Now i`m wondering what file extensions  is best to include or use for reading ?

.dat

.txt

.inc

.others

[JAY6390]

For your script, it doesn't actually make a difference. It's only if you're going to allow people to view it directly that it will make a difference

[Mindaugas]

For example , simple chat and every message saves in file.txt, and i dont want that ppl could see it directly www.name.com/file.txt , just want when ppl come to chat they see only first 5 lines, it will be 5 newest messages.

[JAY6390]

For this you are much better off using a database to be honest

[Mindaugas]

I know, i think it`s easier to use MySQL than work with txt database, but it`s my first project, simple game, and i want to finish it and then learn mysql

[JAY6390]

I see. Well personally I keep any files that I don't want people to have access to outside of the document root folder, so that they aren't accessible via any uri other than internally on the server. I suppose you could use a .htaccess file to block certain file extensions from being access too

[Mindaugas]

Well thx all of you for help really

Have a good day  

[Mindaugas]

I added .htaccess file in my server, added :

<Files ~ "\.(txt)$">
  order allow,deny
  deny from all
</Files>

And now noone can view this file

 

 

p.s. sorry for two posts, maybe this info will be usefull for someone.

[JAY6390]

Excellent