I've been trying to bold a search term in a sentence. If the sentence is Engliš is spoken wörldwide. If my search term is spoken world I want to get Engliš is <b>spoken wörld</b>wide.
I've used this function:
function highlightWords($text, $searchTerm){
$corr = ['a' => '[aäâ]', 'o' => '[oöòóôõ]', 'c' => '[cç]', 's' => '[şśšșŝ]', 'y' => '[ýÿŷȳy]', 'o' => '[ôöòóøōoõ]', 'n' => '[ñńňn]', 'u' => '[üu]'];
$key = preg_quote($searchTerm);
$pattern = '/' . strtr($key, $corr) . '/iu';
$text = preg_replace($pattern, '<b>$0</b>', $text);
return $text;
}
It supposed to work, but I get really strange behavior. Few examples are:
Text is Sygmaý çykdy deşdi-sähra düzünden (sorry for the weird sentence). When $searchTerm is duz it perfectly works, I get Sygmaý çykdy deşdi-sähra <b>düz</b>ünden. If I change search term to sahra, the function returns just plain Sygmaý çykdy deşdi-sähra düzünden.
Works with cykdy and çykdy.
But doesn't work with neither sygmay nor sygmaý. But works with Sygmaý with capital letter.
What should I need to fix in order to get highlighted search term in all scenarios?
There are a couple of problems in the function, specifically in the $corr array.
First, there are two "o" sections, and they are different. Those need to be combined. Second, the unaccented letter must be in the array for each letter. s does not have this, the missing "s" is what is causing this particular failure.
Fixed function:
function highlightWords($text, $searchTerm)
{
$corr = [
'a' => '[aäâ]',
'o' => '[oöòóôõøō]',
'c' => '[cç]',
's' => '[sşśšșŝ]',
'y' => '[yýÿŷȳ]',
'n' => '[nñńň]',
'u' => '[uü]'
];
$key = preg_quote($searchTerm);
$pattern = '/' . strtr($key, $corr) . '/iu';
$text = preg_replace($pattern, '<b>$0</b>', $text);
return $text;
}
$input = 'Sygmaý çykdy deşdi-sähra düzünden';
$term = 'sahra';
$expected = 'Sygmaý çykdy deşdi-<b>sähra</b> düzünden';
$highlighted = highlightWords($input, $term);
assert($highlighted == $expected, 'Term should be marked bold');
echo $highlighted . PHP_EOL;