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Anonymous
6 years ago
The keyword 'use' has two different applications, but the reserved word table links to here.

It can apply to namespace constucts:

file1:
<?php namespace foo;
  class
Cat {
    static function
says() {echo 'meoow';}  } ?>

file2:
<?php namespace bar;
  class
Dog {
    static function
says() {echo 'ruff';}  } ?>

file3:
<?php namespace animate;
  class
Animal {
    static function
breathes() {echo 'air';}  } ?>

file4:
<?php namespace fub;
  include
'file1.php';
  include
'file2.php';
  include
'file3.php';
  use
foo as feline;
  use
bar as canine;
  use
animate;
  echo \
feline\Cat::says(), "<br />\n";
  echo \
canine\Dog::says(), "<br />\n";
  echo \
animate\Animal::breathes(), "<br />\n"?>

Note that
felineCat::says()
should be
\feline\Cat::says()
(and similar for the others)
but this comment form deletes the backslash (why???)

The 'use' keyword also applies to closure constructs:

<?php function getTotal($products_costs, $tax)
    {
       
$total = 0.00;
       
       
$callback =
            function (
$pricePerItem) use ($tax, &$total)
            {
               
               
$total += $pricePerItem * ($tax + 1.0);
            };
       
       
array_walk($products_costs, $callback);
        return
round($total, 2);
    }
?>

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