php array method to delete specified value

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

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php deletes the number of elements with specified values ​​​​in the array Method

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 one:

//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;
}

Method two:

//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);
}

Method three:

//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;
}

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;
}

Summarizing the four methods, the more feasible methods are Method 1 and Method 4. As for which of the two methods is better, it should be analyzed in detail based on the specific situation.

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