如何在PHP中的foreach循环中键入转换变量？

Question

I'm looping through an array using a foreach loop:

$attributes = array( 'drink', 'price', 'amount' );

foreach ( $attributes as $key ) {
    $info[$key] = $key;
}

How can I type cast my $key variable differently each time the loop runs? For example, I need drink to be type string, price to be float and amount to be int.

Please note, this is a simplified example of my code. Type casting the keys before the loop is run isn't suitable in my case.

I tried the following but it didn't seem to work:

$attributes = array( 'drink' => 'string', 'price' => 'float', 'amount' => 'int' );

foreach ( $attributes as $key => $value ) {
    $info[$key] = ($value) $key;
}

Answer 1

This should work for you:

(Here I use the key to then call either strval(), floatval() or intval())

$attributes = array("str" => 'drink',"float"=> "10.5","int"=> "10" );
foreach ( $attributes as $k => $key ) {
    $k.="val";
    $info[$key] = $k($key);
}

var_dump($info);

output:

array(3) {
  ["drink"]=>
  string(5) "drink"
  ["10.5"]=>
  float(10.5)
  [10]=>
  int(10)
}