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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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