PHP에서 한 배열의 요소가 다른 배열에 있는지 확인

PHP에서 한 배열의 요소가 다른 배열에 있는지 확인

---

PHP에는 다음과 같이 두 개의 배열이 있습니다.

사람들:

Array
(
    [0] => 3
    [1] => 20
)

원하는 범죄자 :

Array
(
    [0] => 2
    [1] => 4
    [2] => 8
    [3] => 11
    [4] => 12
    [5] => 13
    [6] => 14
    [7] => 15
    [8] => 16
    [9] => 17
    [10] => 18
    [11] => 19
    [12] => 20
)

여부를 어떻게 확인합니까 어떤 의 사람의 요소가에있는 구인 범죄자의 배열?

이 예에서는 반환해야 true하기 때문 20이다 구함 범죄자 .

---

사용할 수 있습니다 array_intersect().

$result = !empty(array_intersect($people, $criminals));

---

array_intersect () 및 count () (빈 대신)를 사용하면 약간의 문제가 있습니다.

예를 들면 다음과 같습니다.

$bFound = (count(array_intersect($criminals, $people))) ? true : false;

---

'빈'이 최선의 선택이 아닌 경우 다음은 어떻습니까?

if (array_intersect($people, $criminals)) {...} //when found

또는

if (!array_intersect($people, $criminals)) {...} //when not found

---

언어 구조에만 변수를 전달할 수 있으므로 해당 코드는 유효하지 않습니다. empty()언어 구조입니다.

이 작업은 두 줄로 수행해야합니다.

$result = array_intersect($people, $criminals);
$result = !empty($result);

---

in_array와 array_intersect의 성능 테스트 :

$a1 = array(2,4,8,11,12,13,14,15,16,17,18,19,20);

$a2 = array(3,20);

$intersect_times = array();
$in_array_times = array();
for($j = 0; $j < 10; $j++)
{
    /***** TEST ONE array_intersect *******/
    $t = microtime(true);
    for($i = 0; $i < 100000; $i++)
    {
        $x = array_intersect($a1,$a2);
        $x = empty($x);
    }
    $intersect_times[] = microtime(true) - $t;


    /***** TEST TWO in_array *******/
    $t2 = microtime(true);
    for($i = 0; $i < 100000; $i++)
    {
        $x = false;
        foreach($a2 as $v){
            if(in_array($v,$a1))
            {
                $x = true;
                break;
            }
        }
    }
    $in_array_times[] = microtime(true) - $t2;
}

echo '<hr><br>'.implode('<br>',$intersect_times).'<br>array_intersect avg: '.(array_sum($intersect_times) / count($intersect_times));
echo '<hr><br>'.implode('<br>',$in_array_times).'<br>in_array avg: '.(array_sum($in_array_times) / count($in_array_times));
exit;

결과는 다음과 같습니다.

0.26520013809204
0.15600109100342
0.15599989891052
0.15599989891052
0.1560001373291
0.1560001373291
0.15599989891052
0.15599989891052
0.15599989891052
0.1560001373291
array_intersect avg: 0.16692011356354

0.015599966049194
0.031199932098389
0.031200170516968
0.031199932098389
0.031200885772705
0.031199932098389
0.031200170516968
0.031201124191284
0.031199932098389
0.031199932098389
in_array avg: 0.029640197753906

in_array is at least 5 times faster. Note that we "break" as soon as a result is found.

---

You could also use in_array as follows:

<?php
$found = null;
$people = array(3,20,2);
$criminals = array( 2, 4, 8, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20);
foreach($people as $num) {
    if (in_array($num,$criminals)) {
        $found[$num] = true;
    } 
}
var_dump($found);
// array(2) { [20]=> bool(true)   [2]=> bool(true) }

While array_intersect is certainly more convenient to use, it turns out that its not really superior in terms of performance. I created this script too:

<?php
$found = null;
$people = array(3,20,2);
$criminals = array( 2, 4, 8, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20);
$fastfind = array_intersect($people,$criminals);
var_dump($fastfind);
// array(2) { [1]=> int(20)   [2]=> int(2) }

Then, I ran both snippets respectively at: http://3v4l.org/WGhO7/perf#tabs and http://3v4l.org/g1Hnu/perf#tabs and checked the performance of each. The interesting thing is that the total CPU time, i.e. user time + system time is the same for PHP5.6 and the memory also is the same. The total CPU time under PHP5.4 is less for in_array than array_intersect, albeit marginally so.

---

Here's a way I am doing it after researching it for a while. I wanted to make a Laravel API endpoint that checks if a field is "in use", so the important information is: 1) which DB table? 2) what DB column? and 3) is there a value in that column that matches the search terms?

Knowing this, we can construct our associative array:

$SEARCHABLE_TABLE_COLUMNS = [
    'users' => [ 'email' ],
];

Then, we can set our values that we will check:

$table = 'users';
$column = 'email';
$value = 'alice@bob.com';

Then, we can use array_key_exists() and in_array() with eachother to execute a one, two step combo and then act upon the truthy condition:

// step 1: check if 'users' exists as a key in `$SEARCHABLE_TABLE_COLUMNS`
if (array_key_exists($table, $SEARCHABLE_TABLE_COLUMNS)) {

    // step 2: check if 'email' is in the array: $SEARCHABLE_TABLE_COLUMNS[$table]
    if (in_array($column, $SEARCHABLE_TABLE_COLUMNS[$table])) {

        // if table and column are allowed, return Boolean if value already exists
        // this will either return the first matching record or null
        $exists = DB::table($table)->where($column, '=', $value)->first();

        if ($exists) return response()->json([ 'in_use' => true ], 200);
        return response()->json([ 'in_use' => false ], 200);
    }

    // if $column isn't in $SEARCHABLE_TABLE_COLUMNS[$table],
    // then we need to tell the user we can't proceed with their request
    return response()->json([ 'error' => 'Illegal column name: '.$column ], 400);
}

// if $table isn't a key in $SEARCHABLE_TABLE_COLUMNS,
// then we need to tell the user we can't proceed with their request
return response()->json([ 'error' => 'Illegal table name: '.$table ], 400);

I apologize for the Laravel-specific PHP code, but I will leave it because I think you can read it as pseudo-code. The important part is the two if statements that are executed synchronously.

array_key_exists() and in_array() are PHP functions.

source:

• https://php.net/manual/en/function.array-key-exists.php

• https://php.net/manual/en/function.in-array.php

The nice thing about the algorithm that I showed above is that you can make a REST endpoint such as GET /in-use/{table}/{column}/{value} (where table, column, and value are variables).

You could have:

$SEARCHABLE_TABLE_COLUMNS = [
    'accounts' => [ 'account_name', 'phone', 'business_email' ],
    'users' => [ 'email' ],
];

and then you could make GET requests such as:

GET /in-use/accounts/account_name/Bob's Drywall (you may need to uri encode the last part, but usually not)

GET /in-use/accounts/phone/888-555-1337

GET /in-use/users/email/alice@bob.com

Notice also that no one can do:

GET /in-use/users/password/dogmeat1337 because password is not listed in your list of allowed columns for user.

Good luck on your journey.

참고URL : https://stackoverflow.com/questions/523796/checking-to-see-if-one-arrays-elements-are-in-another-array-in-php