Question

I crawl a web to get a title

$title = strip_tags($link1->plaintext);

but in the result, there is a result like Data Mining&#58 Concepts and Techniques

How to remove that &#58 ? thank you

Answer 1

The problem is that : is a character entity reference for a colon, but your example is incorrectly terminated (missing ending semicolon). You can fix unterminated references with the following (rather naive) regular expression:

$broken = "Data Mining&#58 Concepts and Techniques";
$fixed = preg_replace('/(&#x?[a-e0-9]+)\b/i', '$1;', $broken);

You can then use html_entity_decode:

echo html_entity_decode($fixed); // Data Mining: Concepts and Techniques