Question

How can I find & highlight all words from array in text?

example:

$words = array('Test', 'I', 'tHiS', 'diFFerent');

Expecting result is:
Hi, i‘m in this simple test I‘d like to show you who we can replace different words.

Answer 1

$str = preg_replace("~(".implode("|" , array_map(function($a){
    return preg_quote($a,"~");
},$words)).")~i" , "<strong>$1</strong>" , $str);

you may try

$str = preg_replace("~(".implode("|" , array_map(function($a){
    return '\b'.preg_quote($a,"~").'\b';
},$words)).")~i" , "<strong>$1</strong>" , $str);

to specify that it should be full word