这里 PHP 序列化（d）数据库中的数据：
$data = 'a:5:{s:5:"width";i:700;s:6:"height";i:700;s:4:"file";s:22:"2020/11/fragrances.jpg";s:5:"sizes";a:8:{s:21:"woocommerce_thumbnail";a:5:{s:4:"file";s:22:"fragrances-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";s:9:"uncropped";b:0;}s:29:"woocommerce_gallery_thumbnail";a:4:{s:4:"file";s:22:"fragrances-100x100.jpg";s:5:"width";i:100;s:6:"height";i:100;s:9:"mime-type";s:10:"image/jpeg";}s:18:"woocommerce_single";a:4:{s:4:"file";s:22:"fragrances-600x600.jpg";s:5:"width";i:600;s:6:"height";i:600;s:9:"mime-type";s:10:"image/jpeg";}s:6:"medium";a:4:{s:4:"file";s:22:"fragrances-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";}s:9:"thumbnail";a:4:{s:4:"file";s:22:"fragrances-150x150.jpg";s:5:"width";i:150;s:6:"height";i:150;s:9:"mime-type";s:10:"image/jpeg";}s:12:"shop_catalog";a:5:{s:4:"file";s:22:"fragrances-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";s:9:"uncropped";b:0;}s:11:"shop_single";a:4:{s:4:"file";s:22:"fragrances-600x600.jpg";s:5:"width";i:600;s:6:"height";i:600;s:9:"mime-type";s:10:"image/jpeg";}s:14:"shop_thumbnail";a:4:{s:4:"file";s:22:"fragrances-100x100.jpg";s:5:"width";i:100;s:6:"height";i:100;s:9:"mime-type";s:10:"image/jpeg";}}s:10:"image_meta";a:12:{s:8:"aperture";s:1:"0";s:6:"credit";s:0:"";s:6:"camera";s:0:"";s:7:"caption";s:0:"";s:17:"created_timestamp";s:1:"0";s:9:"copyright";s:0:"";s:12:"focal_length";s:1:"0";s:3:"iso";s:1:"0";s:13:"shutter_speed";s:1:"0";s:5:"title";s:0:"";s:11:"orientation";s:1:"0";s:8:"keywords";a:0:{}}}';
我需要将所有“文件”值更改为“new-fragrances.png”
$uns_data = unserialize($data);
$uns_data['file'] = 'new-fragrances.png';
$data = serialize($uns_data);
var_dump($data);
结果（它只改变了第一个键值）：
'a:5:{s:5:"width";i:700;s:6:"height";i:700;s:4:"file";s:18:"new-fragrances.png";s:5:"sizes";a:8:{s:21:"woocommerce_thumbnail";a:5:{s:4:"file";s:22:"fragrances-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";s:9:"uncropped";b:0;}s:29:"woocommerce_gallery_thumbnail";a:4:{s:4:"file";s:22:"fragrances-100x100.jpg";s:5:"width";i:100;s:6:"height";i:100;s:9:"mime-type";s:10:"image/jpeg";}s:18:"woocommerce_single";a:4:{s:4:"file";s:22:"fragrances-600x600.jpg";s:5:"width";i:600;s:6:'... (length=1571)
如何更改密钥文件的所有值？
有很多方法可以遍历数组的每一项。在这种情况下，我会使用array_walk_recursive。在回调函数中array_walk_recursive，对数组中每个项目的值做任何你喜欢的事情。在这个例子中，我替换fragrances为new_fragrances：
$data = 'a:5:{s:5:"width";i:700;s:6:"height";i:700;s:4:"file";s:22:"2020/11/fragrances.jpg";s:5:"sizes";a:8:{s:21:"woocommerce_thumbnail";a:5:{s:4:"file";s:22:"fragrances-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";s:9:"uncropped";b:0;}s:29:"woocommerce_gallery_thumbnail";a:4:{s:4:"file";s:22:"fragrances-100x100.jpg";s:5:"width";i:100;s:6:"height";i:100;s:9:"mime-type";s:10:"image/jpeg";}s:18:"woocommerce_single";a:4:{s:4:"file";s:22:"fragrances-600x600.jpg";s:5:"width";i:600;s:6:"height";i:600;s:9:"mime-type";s:10:"image/jpeg";}s:6:"medium";a:4:{s:4:"file";s:22:"fragrances-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";}s:9:"thumbnail";a:4:{s:4:"file";s:22:"fragrances-150x150.jpg";s:5:"width";i:150;s:6:"height";i:150;s:9:"mime-type";s:10:"image/jpeg";}s:12:"shop_catalog";a:5:{s:4:"file";s:22:"fragrances-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";s:9:"uncropped";b:0;}s:11:"shop_single";a:4:{s:4:"file";s:22:"fragrances-600x600.jpg";s:5:"width";i:600;s:6:"height";i:600;s:9:"mime-type";s:10:"image/jpeg";}s:14:"shop_thumbnail";a:4:{s:4:"file";s:22:"fragrances-100x100.jpg";s:5:"width";i:100;s:6:"height";i:100;s:9:"mime-type";s:10:"image/jpeg";}}s:10:"image_meta";a:12:{s:8:"aperture";s:1:"0";s:6:"credit";s:0:"";s:6:"camera";s:0:"";s:7:"caption";s:0:"";s:17:"created_timestamp";s:1:"0";s:9:"copyright";s:0:"";s:12:"focal_length";s:1:"0";s:3:"iso";s:1:"0";s:13:"shutter_speed";s:1:"0";s:5:"title";s:0:"";s:11:"orientation";s:1:"0";s:8:"keywords";a:0:{}}}';
$uns_data = unserialize($data);
array_walk_recursive($uns_data, function (&$value, $key){
$value = str_replace('fragrances', 'new-fragrances', $value);
});
$data = serialize($uns_data);
var_dump($data);
注意，$value是通过引用传递，使用&$value，所以原来的值可以被修改。
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