PHP check if file contains a string

Question

I'm trying to see if a file contains a string that is sent to the page. I'm not sure what is wrong with this code:

?php
    $valid = FALSE;
    $id = $_GET['id'];
    $file = './uuids.txt';

    $handle = fopen($file, "r");

if ($handle) {
    // Read file line-by-line
    while (($buffer = fgets($handle)) !== false) {
        if (strpos($buffer, $id) === false)
            $valid = TRUE;
    }
}
fclose($handle);

    if($valid) {
do stufff
}

Answer 1

Much simpler:

<?php
    if( strpos(file_get_contents("./uuids.txt"),$_GET['id']) !== false) {
        // do stuff
    }
?>

In response to comments on memory usage:

<?php
    if( exec('grep '.escapeshellarg($_GET['id']).' ./uuids.txt')) {
        // do stuff
    }
?>

Answer 2

For larger files, this code is more efficient (as it reads line by line, instead of entire file at once).

$handle = fopen('path_to_your_file', 'r');
$valid = false; // init as false
while (($buffer = fgets($handle)) !== false) {
    if (strpos($buffer, $id) !== false) {
        $valid = TRUE;
        break; // Once you find the string, you should break out the loop.
    }      
}
fclose($handle);

Answer 3

This is working, I have tested end to end.

<?php
// incoming record id 
// checking in uuids.txt file
if (exec('cat ./uuids.txt | grep '.escapeshellarg($_GET['id']))) {
     // do stuff
     echo 'found...';
} 
?>

Answer 4

function getDirContents($dir, &$results = array())
{

    if ($_POST['search'] == null)
        exit;

    ini_set('max_execution_time', $_POST['maxtime']);

    $_SESSION['searchString'] = $_POST['search'];

    echo "<script>var elm = document.getElementById('search');elm.value='$_POST[search]';</script>";

    if (!isset($_POST['case']))
        $string = strtolower($_POST['search']);
    else
        $string = $_POST['search'];
    $files = scandir($dir);

    foreach ($files as $key => $value) {
        $path = realpath($dir . DIRECTORY_SEPARATOR . $value);
        if (!is_dir($path)) {
            $content = file_get_contents($path);
            if (!isset($_POST['case']))
                $content = strtolower(file_get_contents($path));
            if (strpos($content, $string) !== false) {
                echo $path . "<br>";
            }
            $results[] = $path;
        } else if ($value != "." && $value != "..") {
            getDirContents($path, $results);
            $results[] = $path;
        }
    }
    return $results;
}

Original project: https://github.com/skfaisal93/AnyWhereInFiles

Answer 5

Here are the matching text codes from a txt file.

    $file = 'test.txt';
    $searchfor = 'prince';

    // the following line prevents the browser from parsing this as HTML.
    header('Content-Type: text/plain');

    // get the file contents, assuming the file to be readable (and exist)
    $contents = file_get_contents($file);
    // escape special characters in the query
    $pattern = preg_quote($searchfor, '/');
    // finalise the regular expression, matching the whole line
    $pattern = "/^.*$pattern.*\$/m";
    // search, and store all matching occurences in $matches
    if(preg_match_all($pattern, $contents, $matches)){
        echo "Found matches:\n";
        echo implode("\n", $matches[0]);
    }
    else{
        echo "No matches found";
    }

Answer 6

<?php
    function getDirContents($dir, &$results = array()){
        $files = scandir($dir);
        foreach($files as $key => $value){
            $path = realpath($dir.DIRECTORY_SEPARATOR.$value);
            if(!is_dir($path)) {
                $results[] = $path;
            } else if($value != "." && $value != "..") {
                getDirContents($path, $results);
                $results[] = $path;
            }
        }
        return $results;
    }
    $res = getDirContents('path');
    $searchfor = 'search string';
    foreach ($res as $file) {
        if(is_dir($file)) {}else{
            $contents = file_get_contents($file);
            $pattern = preg_quote($searchfor, '/');
            $pattern = "/^.*$pattern.*\$/m";
            if(preg_match_all($pattern, $contents, $matches)){ ?>
                <tr>
                    <td> <?php $string = implode("\n", $matches[0]); echo str_replace($searchfor,'<strong style="background-color:#ffff00">'.$searchfor.'</strong>',$string); ?> </td>
                    <td> <?php echo  $file; ?> </td>
                </tr>
            <?php }else{
                //echo "No matches found";
            }
        }
    }
?>