我必须这样做，以保持(string) 0的数组值

$url = array_filter($data, function ($value) {
  return (!empty($value) || $value === 0 || $value==='0');
});

    $myarray = array_filter($myarray, 'strlen');  //removes null values but leaves "0"
    $myarray = array_filter($myarray);            //removes all null values

$out_array = array_filter($input_array, function($item) 
{ 
    return !empty($item['key_of_array_to_check_whether_it_is_empty']); 
}
);

简而言之:

这是我建议的代码:

$myarray =  array_values(array_filter(array_map('trim', $myarray), 'strlen'));

解释:

我认为使用array_filter是好的，但还不够，因为值就像空格和\n，…保持在数组中，这通常是不好的。

所以我建议你使用混合‍‍array_filter和array_map。

Array_map用于修整，array_filter用于删除空值，strlen用于保留0值，array_values用于重新索引(如果需要的话)。

样品:

$myarray = array("\r", "\n", "\r\n", "", " ", "0", "a");

// "\r", "\n", "\r\n", " ", "a"
$new1 = array_filter($myarray);

// "a"
$new2 = array_filter(array_map('trim', $myarray));

// "0", "a"
$new3 = array_filter(array_map('trim', $myarray), 'strlen');

// "0", "a" (reindex)
$new4 = array_values(array_filter(array_map('trim', $myarray), 'strlen'));

var_dump($new1, $new2, $new3, $new4);

结果:

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

在线测试:

http://sandbox.onlinephpfunctions.com/code/e02f5d8795938be9f0fa6f4c17245a9bf8777404

foreach($linksArray as $key => $link) 
{ 
    if($link === '') 
    { 
        unset($linksArray[$key]); 
    } 
} 
print_r($linksArray); 

$my = ("0"=>" ","1"=>"5","2"=>"6","3"=>" ");   

foreach ($my as $key => $value) {
    if (is_null($value)) unset($my[$key]);
}

foreach ($my as $key => $value) {
    echo   $key . ':' . $value . '<br>';
} 

输出

1:5 2:6