PHP Validate Value $_GET from url against lines of a txt file

Question

i have a problem i couldn't figure out since im self-taught and still exploring the php world

so i have a text file that looks like this:

and i got an url with a variable

http://example.com/mypage.php?variable=951753159

what i want is to check if the url variable matches one of the txt file lines in order to execute a code

i already tried this

 $search = $_GET["variable"];
 $file = "variables.txt";
 if (preg_match('/^' . $search . '$/m', file_get_contents($file))) { 
 THE CODE THAT I WANT TO EXECUTE
 }

but for some reason it matches the whole content of the file

any help is highly appreciated

Thanks in advance :)

Possible duplicate of [How to read a file line by line in php](http://stackoverflow.com/questions/13246597/how-to-read-a-file-line-by-line-in-php) — David, Nov 17 '15 at 16:57
Maybe this could help you (possible repost) : http://stackoverflow.com/questions/3686177/php-to-search-within-txt-file-and-echo-the-whole-line — SamyQc, Nov 17 '15 at 16:57

score 1 · Answer 1 · answered Nov 17 '15 at 16:57

1

Try with an array from file():

$lines = file("variables.txt", FILE_IGNORE_NEW_LINES);

if(in_array($_GET["variable"], $lines)) {
    // YES FOUND
} else {
    // NOT FOUND
}

answered Nov 17 '15 at 16:57

AbraCadaver

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score 0 · Answer 2 · answered Nov 17 '15 at 16:58

0

From the documentation on `file_get_contents', the entire contents of the file are read as a string. So that is why it is matching against the entire file.

The command that you want to use is file, this reads the file into an array of each line.

answered Nov 17 '15 at 16:58

Schleis

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score 0 · Answer 3 · answered Nov 17 '15 at 16:59

0

I would

Use file to read the file into an array.

Then array_flip the array so that it's values are now the keys

Which allows me to isset($array[$key])

answered Nov 17 '15 at 16:59

Dale

10,384
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score 0 · Answer 4 · answered Nov 17 '15 at 17:02

You can do this.

<?php
#$search = $_GET["variable"];
$search = '123156488';
$file_txt = "content.txt";
$file = file($file_txt);//convert the txt in array
foreach ($file as $key => $value) {
    if (trim($search) == trim($value)) {
        print "DO something! " . $value;
    }
}?>

Regards. Nelson.

PHP Validate Value $_GET from url against lines of a txt file

4 Answers4