如何在php中从另一个数组中删除一个数组？

Question

我在PHP中有以下数组: print_r($employees) =

Array
(
    [0] => Array
        (
            [p_id] => T29083999
            [name] => Robert Plaxo
        )

    [1] => Array
        (
            [p_id] => T29083388
            [name] => Yvan Sergei
        )

    [2] => Array
        (
            [p_id] => T21083911
            [name] => Rhonda Saunders
        )

    [3] => Array
        (
            [p_id] => H02910382
            [name] => Miguel Mercado
        )
)

然后这个数组: print_r($record) =

Array
(
    [0] => Array
        (
            [c_id] => 1
            [section] => 1061
            [term] => 201631
            [p_id] => T29083388
            [c_date] => 2016-04-01 09:14:00
        )

)

我想从$employees中删除与p_id of $record匹配的数组元素。数组$record可能有多个条目，如所示。如果是这样，则必须从p_id中删除$record中的任何$employees。

我试过：

foreach ($employees as $k => $e) {
    foreach ($record as $r) {
        if ($e['p_id']==$r['p_id']) {
            echo "found it!";
            // if I uncomment the next line, it crashes! (500 server error)
            //  unset $employees[$k];
        }           
    }   
}

我只想从$employees中删除任何具有与$record中的任何记录与该雇员id相匹配的雇员的元素。

Answer 1

你就快到了，只是需要父母陪伴你的unset()

我还冒昧地更改了您的一些变量名，因为单个字符变量名称困扰着我。

$employees[] = [
    'p_id' => 'T29083999',
    'name' => 'Robert Plaxo',
];
$employees[] = [
    'p_id' => 'T29083388',
    'name' => 'Yvan Sergei',
];
$employees[] = [
    'p_id' => 'T21083911',
    'name' => 'Rhonda Saunders',
];
$employees[] = [
    'p_id' => 'H02910382',
    'name' => 'Miguel Mercado',
];

$records[] = [
        'c_id' => '1',
        'section' => '1061',
        'term' => '201631',
        'p_id' => 'T29083388',
        'c_date' => '2016-04-01 09:14:00',
];

foreach ($employees as $key => $employee) {
    foreach ($records as $record) {
        if ($employee['p_id'] == $record['p_id']) {
            echo "found it!";
            unset($employees[$key]);
        }
    }
}

echo "<pre>";
print_r($employees);

输出

found it!

Array
(
    [0] => Array
        (
            [p_id] => T29083999
            [name] => Robert Plaxo
        )

    [2] => Array
        (
            [p_id] => T21083911
            [name] => Rhonda Saunders
        )

    [3] => Array
        (
            [p_id] => H02910382
            [name] => Miguel Mercado
        )

)

Answer 2

使用array_column和array_filter函数的简短解决方案。它还将适合您的要求"Array $record可能有多个条目“：

$p_ids = array_column($record, "p_id");
$employees = array_filter($employees, function($v) use($p_ids){
    return !in_array($v["p_id"], $p_ids);     
});

print_r($employees);

产出：

Array
(
    [0] => Array
        (
            [p_id] => T29083999
            [name] => Robert Plaxo
        )

    [2] => Array
        (
            [p_id] => T21083911
            [name] => Rhonda Saunders
        )

    [3] => Array
        (
            [p_id] => H02910382
            [name] => Miguel Mercado
        )
)