php - 在mysql while循环中解析序列化数据

Question

我正在尝试解析 wp_postmeta 表中的 WordPress meta_value 列。

meta_value 行内容采用序列化格式，如下所示:

a:1:{i:0;O:8:"stdClass":2:{s:5:"notes";s:0:"";s:12:"applications";a:5:
{s:4:"Year";O:8:"stdClass":2:
{s:4:"name";s:4:"Year";s:5:"value";s:4:"2006";}s:4:"Make";O:8:"stdClass":2:
{s:4:"name";s:4:"Make";s:5:"value";s:5:"Isuzu";}s:5:"Model";O:8:"stdClass":2:
{s:4:"name";s:5:"Model";s:5:"value";s:5:"i-280";}s:4:"Trim";O:8:"stdClass":2:
{s:4:"name";s:4:"Trim";s:5:"value";s:31:"Base Extended Cab Pickup 2-Door";}s:6:"Engine";O:8:"stdClass":2:
{s:4:"name";s:6:"Engine";s:5:"value";s:54:"2.8L 2770CC 169Cu. In. l4 GAS DOHC Naturally Aspirated";}}}}

我能够使用 while 循环来反序列化数据

$results = $mysqli->query("SELECT meta_value
           FROM wp_postmeta
           WHERE meta_key = '_ebay_item_compatibility_list';");

while($row = $results->fetch_array()) {
echo '<pre>';
print_r(unserialize($row['meta_value']));
echo '</pre>';
                                      }

这给了我类似的输出

Array
(
    [0] => stdClass Object
        (
            [notes] => ONLY FITS 6 LUG VEHICLES 
            [applications] => Array
                (
                [Year] => stdClass Object
                    (
                        [name] => Year
                        [value] => 2008
                    )

                [Make] => stdClass Object
                    (
                        [name] => Make
                        [value] => Toyota
                    )

                [Model] => stdClass Object
                    (
                        [name] => Model
                        [value] => Tacoma
                    )

                [Trim] => stdClass Object
                    (
                        [name] => Trim
                        [value] => Base Crew Cab Pickup 4-Door
                    )

                [Engine] => stdClass Object
                    (
                        [name] => Engine
                        [value] => 2.7L 2694CC l4 GAS DOHC Naturally Aspirated
                    )

            )

    )

[1] => stdClass Object
    (
        [notes] => ONLY FITS 6 LUG VEHICLES 
        [applications] => Array
            (
                [Year] => stdClass Object
                    (
                        [name] => Year
                        [value] => 2008
                    )

                [Make] => stdClass Object
                    (
                        [name] => Make
                        [value] => Toyota
                    )

                [Model] => stdClass Object
                    (
                        [name] => Model
                        [value] => Tacoma
                    )

                [Trim] => stdClass Object
                    (
                        [name] => Trim
                        [value] => Base Crew Cab Pickup 4-Door
                    )

                [Engine] => stdClass Object
                    (
                        [name] => Engine
                        [value] => 4.0L 3956CC 241Cu. In. V6 GAS DOHC Naturally Aspirated
                    )

            )

    )

我想做的是访问所有value元素。

含义类似于 $year = ['Year']['value']; 、 $make = ['Make']['value']; 等.

如何在 while 循环中访问这些 value 元素？

Answer 1

您有 stdClass 对象和数组的组合，因此对于数组，您通常使用 [] 和对象的属性 ->

示例:

while($row = $results->fetch_array()) {
    $foo = unserialize($row['meta_value']);
    $foo[0]->applications['Make']->value;

}

编辑:如果一行中有更多数组元素，可以使用 foreach

while($row = $results->fetch_array()) {
        $foo = unserialize($row['meta_value']);
        foreach ( $foo as $f) {
            foreach ( $f->applications as $application) {
                echo $application->value;
            }
        }
}