Several ways to delete elements with specified values ​​in php arrays

PHP array is a collection of data, which organizes a series of data to form an operable whole. It is needed for many developments. This article introduces several ways to delete specified value elements in PHP arrays. Method, what we most easily think of is unset deletion after foreach traversal, so what other methods are there?

//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 four:

//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;  
}

Of the above four methods, method one and method four are better. Which method you think is more preferable is up to you to decide.

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