PHP Detect Duplicate Text

Question

I have a site where users can put in a description about themselves.

Most users write something appropriate but some just copy/paste the same text a number of times (to

Answer 1

// 3 examples of how you might detect repeating user input

// use preg_match

// pattern to match agains
$pattern = '/^text goes here$/';

// the user input
$input = 'text goes here';

// check if its match
$repeats = preg_match($pattern, $input);

if ($repeats) {
    var_dump($repeats);
} else {
    // do something else
}

// use strpos

$string = 'text goes here';
$input = 'text goes here';
$repeats = strpos($string, $input);

if ($repeats !== false) {
    # code...
    var_dump($repeats);
} else {
    // do something else
}

// or you could do something like:
function repeatingWords($str)
{
    $words = explode(' ', trim($str));  //Trim to prevent any extra blank
    if (count(array_unique($words)) == count($words)) {
        return true; //Same amount of words
    }

    return false;
}

$string = 'text goes here. text goes here. ';

if (repeatingWords($string)) {
    var_dump($string);
} else {
    // do something else
}