Change url slug to camel case

Question

I have the following string in PHP:

this-is_a-test

I want to change that to this:

thisIsATest

So the string can contain any numer of dashes or underscores. I need some regex function that changes the string to a camel case string.

How can this be done?

Answer 1

Use preg_replace_callback:

$string = 'this-is_a-test';

function toUpper($matches) {
  return strtoupper($matches[1]);
}

echo preg_replace_callback('/[-_](.)/', 'toUpper', $string); // thisIsATest

DEMO.