如何根据键合并两个PHP数组？array_merge覆盖问题求解决

Hey there, I totally get why array_merge() isn't working for you here—since both arrays share identical string keys, array_merge() will overwrite the values from the first array with those from the second, which is exactly what you don't want.

Let's fix this by building a custom solution that concatenates values based on matching keys. Here's how you can do it:

Step 1: Define Your Original Arrays #

First, let's make sure your arrays are properly formatted (I've cleaned up the syntax a bit for clarity):

$Record1 = [
    '647242M40642NGG916' => '647242|M40642NGG916|10',
    '647242M40725NG6621' => '647242|M40725NG6621|11',
    '647242M40732NG0287' => '647242|M40732NG0287|11',
    '647242M90830FYIF18' => '647242|M90830FYIF18|10',
    '647242M91221EXDU57' => '647242|M91221EXDU57|11',
    '647242M91304EX8878' => '647242|M91304EX8878|10'
];

$Record2 = [
    '647242M40642NGG916' => '|96',
    '647242M40725NG6621' => '|95',
    '647242M40732NG0287' => '|99',
    '647242M90830FYIF18' => '|93',
    '647242M91221EXDU57' => '|99',
    '647242M91304EX8878' => '|92'
];

Step 2: Custom Merge with Value Concatenation #

We'll use a foreach loop to iterate through the first array, then check if the same key exists in the second array. If it does, we'll concatenate the values; if not, we'll keep the original value from the first array (this adds a bit of safety in case keys are missing):

$Record3 = [];

foreach ($Record1 as $key => $value) {
    // Check if the key exists in Record2 to avoid undefined index warnings
    if (isset($Record2[$key])) {
        $Record3[$key] = $value . $Record2[$key];
    } else {
        $Record3[$key] = $value;
    }
}

// Output the result
print_r($Record3);

What This Does #

This code will produce exactly the $Record3 you're looking for:

Array
(
    [647242M40642NGG916] => 647242|M40642NGG916|10|96
    [647242M40725NG6621] => 647242|M40725NG6621|11|95
    [647242M40732NG0287] => 647242|M40732NG0287|11|99
    [647242M90830FYIF18] => 647242|M90830FYIF18|10|93
    [647242M91221EXDU57] => 647242|M91221EXDU57|11|99
    [647242M91304EX8878] => 647242|M91304EX8878|10|92
)

Alternative: Using array_map (More Functional Style) #

If you prefer a shorter, functional approach, you can use array_map with array_keys:

$keys = array_keys($Record1);
$Record3 = array_combine(
    $keys,
    array_map(function($key) use ($Record1, $Record2) {
        return $Record1[$key] . (isset($Record2[$key]) ? $Record2[$key] : '');
    }, $keys)
);

This achieves the same result but uses array functions instead of a loop—choose whichever fits your coding style better!

内容的提问来源于stack exchange，提问作者JOSE0219