Please tell me where is the error? As long as I run it in the browser, I get an error.

Question

<?php

function one($aa){

## return $aa;

}

echo one(aa:'ccc');

?>

As long as it is run in the browser, an error will be reported

Answer 1

PHP uses "." as the connector, and the variable aa in your echo one(aa:'ccc'); is not declared, or define ('aa',111); defines a constant

Answer 2

Still reporting an error

Answer 3

<?php 
function one($aa){
return $aa;
};
$array = array("aa" => "ccc");
print_r (one($array)['aa']);
 ?>
 你试试这样 ，你传的参数有问题不能直接这样传，你要那样子的话只能转换成数组或对象，就像上面一样