PHP - Read data in .txt and output $Data?

Question

Hello so I have a text file that as this

data.txt

data e.g. username

I need this to out put into a $tag

File.php

if ($username == "$data") { echo "User Found" } else{ echo "User not found";}

Any help on this would really be nice :)?

Answer 1

One method that can be used here and that I took from one of my script libraries, is making use of preg_match() and using both the \b word boundary option, and the i switch for case-insenstivity, which will work for single or multi-line data. Will match "john" or "John", as an example.

<?php 
$_POST['name'] = "john";

$var = trim($_POST['name']); // should there be a space entered
// $var = $_POST['name'];

$pattern = "/\b$var\b/i";

$fh = fopen('data.txt', 'r') or die("Can't open file");
while (!feof($fh)) {
    $line = fgets($fh, 4096);
    if (preg_match($pattern, $line)) { 

echo "MATCH FOUND";

    }

else{
echo "NOT FOUND";
}

}

fclose($fh);

However, this will not work if an entry is seperated by a space. I.e.: "john doe".

You will need to use the following, if that is the case and stripos() for case-insensitivity.

<?php 
$_POST['name'] = "john doe";

$search = trim($_POST['name']);
// $search = $_POST['name'];


// Read from file
$lines = file('data.txt');
foreach($lines as $line)
{
  // Check if the line contains the string we're looking for, and print if it does
  if(stripos($line, $search) !== false){
    echo "Found: " . $line; }

}

---

References:

• http://php.net/manual/en/function.preg-match.php - Consult example #2 about this method.
• http://php.net/manual/en/function.fopen.php
• http://php.net/manual/en/function.fgets.php
• http://php.net/trim
• http://php.net/stripos

---

Footnotes:

• A database will be much easier to achieve this and will provide a lot more freedom and flexibility than a text-based/flatfile method.

Answer 2

$data = file_get_contents('filehere');
if($username == $data) { echo "User found"; } else { echo "User not found"; }

user_pass.txt:

thomas password
john password2

Code:

<?PHP
$data = fopen('user_pass.txt', 'r');
while (($line = fgets($data)) !== FALSE) {
    $data = explode(' ', $data);
    if ($username == $data[0] && $password == $data[1]) {
        echo "User found";
    } else {
        echo "User not found";
    }
}
?>

Unless I missed something? If you get an errors please reply.

Answer 3

Function search: post function search in PHP

  function search($search, $string) {

    $pos = strpos($string, $search);  

    if ($pos === false) {

      echo "The string '$search' was not found.";       

    } else {

      echo "The string '$search' was found ";   
      echo "and exists at position $pos.";  

    }    

  }

love.txt as file

we
love
php
programming

open file:

  $file = fopen("love.txt", "r");

call function search and function fread for open file 'love.txt'

  search("love", fread($file, filesize("love.txt")));

Result:

The string 'love' was found and exists at position 4.