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 .
Recommended: "PHP Video Tutorial"
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.
The above is the detailed content of php array method to delete specified value. For more information, please follow other related articles on the PHP Chinese website!