Function syntax issues

Question

echo '4. Use function to create a self-executing function: <br>';

echo (function ($a,$b){

return $a.' ' .$b.'='.($a $b);

})(20,30);

How to display Parse error: syntax error, unexpected ';' in

Answer 1

Versions below php 7 do not support this writing method. You can try changing to php7 and it can be output! !