在 PHP 7.4 中执行 array_diff — 计算数组的差集 时，报错：Object of class ThemeVersion could not be converted to string

1、在 PHP 7.4 中执行 array_diff — 计算数组的差集 时，报错：Object of class ThemeVersion could not be converted to string。如图1

图1

{
    "message": "Object of class Modules\\ThemeStoreDb\\ThemeSetting\\ThemeVersion could not be converted to string",
    "status_code": 500,
    "debug": {
        "line": 299,
        "file": "E:\\wwwroot\\object\\Modules\\ThemeStoreDb\\Handlers\\ThemeHandler.php",
        "class": "Symfony\\Component\\Debug\\Exception\\FatalThrowableError",
        "trace": [
            "#0 E:\\wwwroot\\object\\Modules\\ThemeStoreDb\\Handlers\\ThemeHandler.php(299): array_diff(Array, Array)",
        ]
    }
}

2、代码实现如下，分别打印两个比较的数组

print_r($versions);
print_r($executedMigrations);
exit;
$scheduledVersions = array_diff($versions, $executedMigrations);

Array
(
    [0] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => 2023_07_07_10_custom_mobile_layout
        )

    [1] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.0.20
        )

    [2] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.0.21
        )

    [3] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.0.28
        )

    [4] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.1
        )

    [5] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.2
        )

    [6] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.3
        )

    [7] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.30
        )

    [8] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.65
        )

    [9] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.70
        )

    [10] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.80
        )

)
Array
(
    [0] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.0.20
        )

    [1] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.0.21
        )

    [2] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.0.28
        )

    [3] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.1
        )

    [4] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.2
        )

    [5] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.3
        )

    [6] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.30
        )

)

3、调整为 array_udiff — 用回调函数比较数据来计算数组的差集。strcasecmp — 二进制安全比较字符串（不区分大小写）

//$scheduledVersions = array_diff($versions, $executedMigrations);
$scheduledVersions = array_udiff($versions, $executedMigrations, function ($version, $executedMigration) {
	return strcasecmp($version->version, $executedMigration->version);
});

4、最后的结果符合预期。

Array
(
    [0] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.65
        )

    [1] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.70
        )

    [2] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => v2.1.80
        )

    [3] => Modules\ThemeStoreDb\ThemeSetting\ThemeVersion Object
        (
            [version] => 2023_07_07_10_custom_mobile_layout
        )

)