Wrap every case-insensitive occurrence of a search term in <mark> tags for quick visual highlighting in search results. Properly escapes HTML so user input cannot inject markup.
PHP
<?php
function highlightTerm(string $text, string $term): string {
if ($term === '') return htmlspecialchars($text, ENT_QUOTES);
$escapedText = htmlspecialchars($text, ENT_QUOTES);
$escapedTerm = htmlspecialchars($term, ENT_QUOTES);
$pattern = '/(' . preg_quote($escapedTerm, '/') . ')/iu';
return preg_replace($pattern, '<mark>$1</mark>', $escapedText);
}
echo highlightTerm("PHP is great, PHP is fun.", "php");
// <mark>PHP</mark> is great, <mark>PHP</mark> is fun.Save your own code snippets
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