How can a PHP script be used to replace duplicate strings within a larger string with sequential numbering?

When dealing with a larger string containing duplicate substrings, we can use a PHP script to replace these duplicates with sequential numbering. One way to achieve this is by using regular expressions to find all occurrences of the duplicate substrings and then replacing them with a unique identifier. By keeping track of the occurrences and incrementing the identifier for each replacement, we can effectively replace all duplicates with sequential numbering. 

<?php
$string = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis sit amet sit amet risus.";

$pattern = '/\b(\w+)\b(?=.*\b\1\b)/';
$replacement = '${1}__COUNT__';

$count = 1;
while (preg_match($pattern, $string)) {
    $string = preg_replace($pattern, '${1}_' . $count, $string, 1);
    $count++;
}

$string = str_replace('__COUNT__', '', $string);

echo $string;
?>

Keywords

PHP string manipulation preg_replace regular expressions sequential numbering

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