How to delete php array based on value

php Array deletion method based on value: 1. Use unset to delete after traversing through foreach; 2. Delete using unset after passing array_flip; 3. Delete through array_search; 4. Use array_keys to search for the specified value and then delete in a loop .

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to delete php array based on value?

Common methods for PHP to delete elements with a specified value in an array

The examples in this article describe PHP deleting elements with a specified value in an array. Share it with everyone for your reference, the details are as follows:

The test array is as follows:

//这是一个测试数组
$testArr = array(
  't' => 'qq',
  'q' => 'qq',
  'b' => 'baidu',
  'a' => 'ali',
  'm' => 'xiaomi'
);

Method 1:

//foreach遍历后unset删除,这种方法也是最容易想到的方法
function delByValue($arr, $value){
  if(!is_array($arr)){
    return $arr;
  }
  foreach($arr as $k=>$v){
    if($v == $value){
      unset($arr[$k]);
    }
  }
  return $arr;
}

Test:

$testArr = delByValue($testArr,'baidu');
print_r($testArr)

Run result:

Array
(
[t] => qq
[q] => qq
[a] => ali
[m] => xiaomi
)

Method 2:

//array_flip之后unset,这种方法有一个弊端，就是反转后由于有两个键值都为qq，有一个数据将会丢失，所以在使用时请谨慎）
function delByValue($arr, $value){
  $tempArr = array_flip($arr);
  unset($tempArr[$value]);
  return array_flip($tempArr);
}

Test:

$testArr = delByValue($testArr,'baidu');
print_r($testArr)

Running results:

Array
(
[q] => qq
[a] => ali
[m] => xiaomi
)

Method 3:

//array_search,这种方法亦有弊端，array_search搜索到一个合适的值时便返回，所以在数组存在多个相关的值这种方法不适用）
function delByValue($arr, $value){
  $key = array_search($value,$arr);
  if(isset($key)){
    unset($arr[$key]);
  }
  return $arr;
}

Test:

$testArr = delByValue($testArr,'baidu');
print_r($testArr)

Running result:

Array
(
[t] => qq
[q] => qq
[a] => ali
[m] => xiaomi
)

Method 4:

//使用array_keys搜索指定的值再循环unset）
function delByValue($arr, $value){
  $keys = array_keys($arr, $value);
  var_dump($keys);
  if(!empty($keys)){
    foreach ($keys as $key) {
      unset($arr[$key]);
    }
  }
  return $arr;
}

Test:

$testArr = delByValue($testArr,'baidu');
print_r($testArr)

Run result:

array(1) {
[0] =>
string(1) "b"
}
Array
(
[t] => qq
[q] => qq
[a ] => ali
[m] => xiaomi
)

Summarizing the four methods, the more feasible ones are method 1 and method 4. As for these two Which method is better depends on the specific situation.

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