PHP中数组中的条件

Question

I have a great couple of variables named $value1, $value2 etc. I want to create an array key for each variable only if the variable is not empty. Something like this:

$array = array(
    If (!empty($value1)) { "bar" => "foo", }
    If (!empty($value2)) { "foo" => "bar", }
);

How do I do this and what would be good practice?

Answer 1

PHP arrays are dynamic, so you can add stuff to it easily:

$array = array(); // start with empty one

if (!empty($value1)) $array['bar'] = 'foo';
if (!empty($value2)) $array['foo'] = 'bar';

// you don't even have to specify a key, 
// it will just increment accordingly if left out
if (!empty($value3)) $array[] = 'foobar';

this will result in (if all 3 vars are non-empty):

array(3) {
  'a' => 'foo',
  'b' => 'bar',
  0   => 'foobar'
}

http://php.net/manual/en/language.types.array.php#language.types.array.syntax.modifying