Question

I have this string:

$str = '<div class="defaultClass">...</div>';

how do I append ‘myClass’ next to ‘defaultClass’ ?

Answer 1

The “class” attribute is just a space separated list of classes.

$str = '<div class="defaultClass myClass">...</div>';

Or you could hack it together like this:

$str = '<div class="defaultClass">...</div>';
$str = str_replace('class="defaultClass', 'class="myClass defaultClass', $str);
//Result: <div class="myClass defaultClass">...</div>

Or with regular expressions:

$str = '<div class="defaultClass">...</div>';
$str = preg_replace(':class="(.*defaultClass.*)":', 'class="\1 myClass"', $str);
//Result: <div class="defaultClass myClass">...</div>

Other solutions include using XML to add it to the DOM node, which is probably less error prone but more advanced and resource heavy.