Comma¶
Commas are syntax elements, to separate elements when provided as a list.
argument separator
parameter separator
trait name separator, in use expression
array element separator
list separator, where unused values may be omitted, leaving commas back to back.
They do not have a value by themselves.
<?php
function foo($a, $b) {
return [$a, 2, $b];
}
list($y,, $z) = foo(1, 2);
?>