How can I strip whitespace only elements from an array?

Question

How I can remove all elements of an array that contain just whitespace, not whitespace in an element like \"foobar \" but just empty array elements like <

Answer 1

preg_grep() is your friend.

$array = array("This", " ", "is", " ", "a", " ", "test.");

$array = preg_grep('/^\s*\z/', $array, PREG_GREP_INVERT);

var_dump($array);

CodePad.

This will drop all array members of which the string is blank or only consist of whitespace according to \s character class (spaces, tabs, and line breaks).

Output

array(4) {
  [0]=>
  string(4) "This"
  [2]=>
  string(2) "is"
  [4]=>
  string(1) "a"
  [6]=>
  string(5) "test."
}