highlight word in php

 This demo is for highlight word in string.


$str = 'aa ww rr tt Aa AA aa';

$search = 'aa';

echo highlight($search, $str );

function highlight($term, $target)
{
$terms = array_unique(explode(" ", $term)); // we only want to replace each term once
foreach ($terms as $term)
{
$target = preg_replace('/\b(' . preg_quote($term) . ')\b/i', "$1", $target);
}

return $target;
}