如何从帖子元数据中提取数据

使用从数据库中提取信息的最佳方法是什么get_post_meta?

field name = invoice_details

value = a:20:{s:15:"price_per_night";s:3:"150";s:12:"no_of_nights";s:1:"1";s:23:"price_calulating_nights";s:3:"150";s:22:"price_after_commission";s:3:"150";s:13:"discount_type";s:0:"";s:20:"price_after_discount";s:3:"150";s:16:"discounted_price";s:1:"0";s:19:"discount_percentage";s:0:"";s:17:"total_service_fee";s:2:"60";s:11:"total_price";s:3:"210";s:8:"currency";s:3:"GBP";s:7:"post_id";s:2:"21";s:8:"check_in";s:10:"02-07-2017";s:9:"check_out";s:10:"03-07-2017";s:6:"guests";s:1:"1";s:16:"security_deposit";s:3:"100";s:10:"secret_key";s:30:"FfmtXmaPOKbrS8B1XLugufiD3Hdjxl";s:10:"updated_at";s:19:"2017-06-25 17:04:33";s:18:"booking_request_by";i:2;s:17:"step_2_attributes";a:9:{s:9:"firstname";s:3:"Tom";s:8:"lastname";s:5:"Smith";s:14:"street_address";s:3:"229";s:11:"postal_code";s:8:"YW11 3DU";s:4:"city";s:6:"London";s:7:"country";s:14:"United Kingdom";s:5:"phone";s:10:"0799999999";s:11:"guest_fname";a:1:{i:1;s:5:"Bella";}s:11:"guest_lname";a:1:{i:1;s:4:"King";}}}

例如，如何将“firstname”字段检索为“James”？

我目前正在使用：

$billing_firstname = get_post_meta( $post->ID, $invoice_details[\'firstname\'] , true );

任何帮助都将不胜感激。

非常感谢。

未序列化值：

array (
  \'price_per_night\' => \'150\',
  \'no_of_nights\' => \'1\',
  \'price_calulating_nights\' => \'150\',
  \'price_after_commission\' => \'150\',
  \'discount_type\' => \'\',
  \'price_after_discount\' => \'150\',
  \'discounted_price\' => \'0\',
  \'discount_percentage\' => \'\',
  \'total_service_fee\' => \'60\',
  \'total_price\' => \'210\',
  \'currency\' => \'GBP\',
  \'post_id\' => \'21\',
  \'check_in\' => \'02-07-2017\',
  \'check_out\' => \'03-07-2017\',
  \'guests\' => \'1\',
  \'security_deposit\' => \'100\',
  \'secret_key\' => \'FfmtXmaPOKbrS8B1XLugufiD3Hdjxl\',
  \'updated_at\' => \'2017-06-25 17:04:33\',
  \'booking_request_by\' => 2,
  \'step_2_attributes\' => 
  array (
    \'firstname\' => \'Tom\',
    \'lastname\' => \'Smith\',
    \'street_address\' => \'229\',
    \'postal_code\' => \'YW11 3DU\',
    \'city\' => \'London\',
    \'country\' => \'United Kingdom\',
    \'phone\' => \'0799999999\',
    \'guest_fname\' => 
    array (
      1 => \'Bella\',
    ),
    \'guest_lname\' => 
    array (
      1 => \'King\',
    ),
  ),
)

// Get the value from db first $meta_value = get_post_meta( $post->ID, \'invoice_details\' , true ); //\'invoice_details\' is a string, not a variable // Get to the desired value $desired_value = $meta_value[\'array_key\']; // value from first step of array

<?php array ( \'price_per_night\' => \'150\', \'no_of_nights\' => \'1\', \'price_calulating_nights\' => \'150\', \'price_after_commission\' => \'150\', \'discount_type\' => \'\', \'price_after_discount\' => \'150\', \'discounted_price\' => \'0\', \'discount_percentage\' => \'\', \'total_service_fee\' => \'60\', \'total_price\' => \'210\', \'currency\' => \'GBP\', \'post_id\' => \'21\', \'check_in\' => \'02-07-2017\', \'check_out\' => \'03-07-2017\', \'guests\' => \'1\', \'security_deposit\' => \'100\', \'secret_key\' => \'FfmtXmaPOKbrS8B1XLugufiD3Hdjxl\', \'updated_at\' => \'2017-06-25 17:04:33\', \'booking_request_by\' => 2, \'step_2_attributes\' => array ( \'firstname\' => \'Tom\', \'lastname\' => \'Smith\', \'street_address\' => \'229\', \'postal_code\' => \'YW11 3DU\', \'city\' => \'London\', \'country\' => \'United Kingdom\', \'phone\' => \'0799999999\', \'guest_fname\' => array ( 1 => \'Bella\', ), \'guest_lname\' => array ( 1 => \'King\', ), ), );

列出分类法：如果分类法没有POST，就不要列出分类法--取决于定制的POST-META？

这可能很难解释，我不知道是否有解决办法！？我有一个名为“wr\\u event”的自定义帖子类型和一个名为“event\\u type”的分层自定义分类法。自定义帖子类型有一个元框，用于event_date 并且与此帖子类型关联的所有帖子都按以下方式排序event_date. 我在循环中有一个特殊的条件来查询event_date 已经发生了-在这种情况下，它没有显示，但只列在我的档案中。就像你可以使用wp_list_categories() 我编写了一个自定义函数，它以完全相同的方式列出所有分类术语。现在

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列出分类法：如果分类法没有POST，就不要列出分类法--取决于定制的POST-META？