如何从数组中删除仅空白元素？

preg_grep()

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

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

var_dump($array);

\\s

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

$arr = array(\"This\", \" \", \"is\", \" \", \"a\", \" \", \"test.\");
$result = array();
for($arr as $x) {
     if(!preg_match(\"/^\\s*$/\", $x)) $result[] = $x;
}
$arr = $result;

array_filter

trim()

$a = array_filter($a, \'trim\');

$array = array(\'foo\',\'  \',\'bar \');

foreach ($array as $key => $value) {
    if (trim($value) == \'\') unset($array[$key]);
}

array(2) {
  [0]=>
  string(3) \"foo\"
  [2]=>
  string(4) \"bar \"
}

 if($value=\" \")

  {

/* optional */

  }

}