Question

我有以下数组：

array(4) {
  [29] => NULL
  [31] => NULL
  [33] => NULL
  [35] => NULL
}

如果所有键都包含NULL值，我想测试所有键。

Answer 1

if(count(array_filter($input, 'is_null')) == count($input)) { 

}

应该是你要找的东西：）

Answer 2

// need php version >= 5.3 or you need to define a function, or just use a loop to check.
if (!count(array_filter($your_array, function($var){return $var !== null}))) {
  // all values is null.
}

Answer 3

超级简单的方法：

function allNULL($array){
  foreach($array as $i)
   if($i!=null) 
    return FALSE;
  return TRUE;
}

Answer 4

<?php
    $filternull = function( $value ) {
       return $value !== null;
    }

    $remaining = array_filter( $yourarray, $filternull );

    echo count( $remaining ); 
    // === 0, if all were "null";
?>

测试空嵌套数组

4 个答案: