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WordPress: Function Reference/add post meta：修訂間差異

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（新頁面: ==Description== add_post_meta adds a custom (meta) field to the specified post. If the <tt>$unique</tt> parameter is set to <var>true</var>...）
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==Description==
==描述==
[[WordPress:Function Reference/add post meta|add_post_meta]] adds a custom (meta) field to the specified post.
[[WordPress:Function Reference/add post meta|add_post_meta]]為某篇文章添加了一個(gè)自定義的（meta）區(qū)。


If the <tt>$unique</tt> parameter is set to <var>true</var> and the specified meta key already exists, the function returns <var>false</var> and makes no changes; otherwise, it returns <var>true</var>.
如果<tt>$unique</tt>參數(shù)設(shè)置為<var>true</var>而且已經(jīng)存在特別的meta關(guān)鍵詞，函數(shù)返回<var>false</var>而且不做什么更改；否則的話，函數(shù)返回<var>true</var>。
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==用法==


==Usage==
%%% <?php add_post_meta($post_id, $meta_key, $meta_value, $unique); ?> %%%
%%% <?php add_post_meta($post_id, $meta_key, $meta_value, $unique); ?> %%%
==Examples==
===Default Usage===
<?php add_post_meta($68, 'my_key', 47); ?>


===Adding or updating a unique field===
==例子==


Adds a new field if the key doesn't exist, or updates the existing field.
===默認(rèn)用法===


? <?php add_post_meta(7, 'fruit', 'banana', true) or update_post_meta(7, 'fruit', 'banana'); ?>
<?php add_post_meta($68, 'my_key', 47); ?>


===Other Examples===
===添加或者更新一個(gè)獨(dú)特的區(qū)===
If you wanted to make sure that there were no fields with the key ''"my_key"'', before adding it:
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<?php add_post_meta(68, 'my_key', '47', true); ?>
如果你存在關(guān)鍵詞，添加一個(gè)新的field，或者更新現(xiàn)存的field。
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? <?php add_post_meta(7, 'fruit', 'banana', true) 或者update_post_meta(7, 'fruit', 'banana'); ?>
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===其它的例子===
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如果你想要確定沒有帶有關(guān)鍵字''"my_key"''的fieled，添加之前：
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<?php add_post_meta(68, 'my_key', '47', true); ?>
To add several values to the key ''"my_key"'':
To add several values to the key ''"my_key"'':
<pre><?php add_post_meta(68, 'my_key', '47'); ?>
<pre><?php add_post_meta(68, 'my_key', '47'); ?>
第24行： 第30行：
<?php add_post_meta(68, 'my_key', 'The quick, brown fox jumped over the lazy dog.'); ?>
<?php add_post_meta(68, 'my_key', 'The quick, brown fox jumped over the lazy dog.'); ?>
...</pre>
...</pre>
For a more detailed example, go to the [[WordPress:Function Reference/post meta Function Examples|post_meta Functions Examples]] page.


=== Making a "Hidden" Custom Field ===
更詳細(xì)的例子，請(qǐng)進(jìn)入[[WordPress:Function Reference/post meta Function Examples|post_meta 函數(shù)例子]]網(wǎng)頁。
If you are a plugin / theme developer and you are planning to use custom fields to store parameters related to your plugin or template, it is interesting to note that WordPress wont show keys starting with an "_" (underscore) in the custom fields list at the page / post editing page. That being said, it is a good practice to use an underscore as the first character in your custom parameters, that way your settings are stored as custom fields, but they won't display in the custom fields list in the admin UI.
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=== 制作一個(gè) "隱藏的" 自定義區(qū) ===
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如果你是一個(gè)插件/主題開發(fā)人員而且你計(jì)劃使用自定義field儲(chǔ)存與你的插件或者主題相關(guān)的參數(shù)，你會(huì)饒有興趣地發(fā)現(xiàn)，WordPress習(xí)慣于顯示網(wǎng)頁/文章編輯網(wǎng)頁中自定義field列表上以"_"（下劃線）開始的關(guān)鍵字。就是說，在自定義參數(shù)中將下劃線設(shè)置為第一個(gè)字符，是個(gè)很好的做法，這樣你可以將設(shè)置儲(chǔ)存為自定義fields，但是你的設(shè)置不會(huì)在管理UI中的自定義fields列表中顯示。


The following example:
下面的例子：
<?php add_post_meta(68, '_color', 'red', true); ?>
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will add a unique custom field with the key name "_color" and the value "red" but this custom field will not display in the page / post editing page.
<?php add_post_meta(68, '_color', 'red', true); ?>
會(huì)添加一個(gè)關(guān)鍵字是 "_color" 的自定義范圍而且這個(gè)自定義范圍中的參數(shù)值"red"不會(huì)在網(wǎng)頁/文章編輯網(wǎng)頁中顯示。
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==參數(shù)==


==Parameters==
{{Parameter|$post_id|integer|The ID of the post to which you will add a custom field.}}
{{Parameter|$post_id|integer|The ID of the post to which you will add a custom field.}}
{{Parameter|$meta_key|string|The key of the custom field you will add.}}
{{Parameter|$meta_key|string|The key of the custom field you will add.}}
{{Parameter|$meta_value|string|The value of the custom field you will add.}}
{{Parameter|$meta_value|string|The value of the custom field you will add.}}
{{Parameter|$unique|boolean|Whether or not you want the key to be unique. When set to true, this will ensure that there is not already a custom field attached to the post with <tt>$meta_key</tt> as it's key, and, if such a field already exists, the key will not be added.|optional|false}}
{{Parameter|$unique|boolean|Whether or not you want the key to be unique. When set to true, this will ensure that there is not already a custom field attached to the post with <tt>$meta_key</tt> as it's key, and, if such a field already exists, the key will not be added.|optional|false}}
==Related==
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{{Parameter|$post_id|integer|你添加一個(gè)自定義范圍的文章的ID。}}
{{Parameter|$meta_key|string|你將要添加的自定義field的關(guān)鍵詞。}}
{{Parameter|$meta_value|string|你將要添加的自定義field的參數(shù)值。}}
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{{Parameter|$unique|boolean|你是否想要獨(dú)特的關(guān)鍵字。如果設(shè)置為真的，能夠確保不存在文章的關(guān)鍵字with <tt>$meta_key</tt> 如果這個(gè)field已經(jīng)存在，這個(gè)關(guān)鍵詞就不會(huì)得到添加。|optional|false}}
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==相關(guān)的==
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[[WordPress:Function Reference/delete post meta|delete_post_meta()]], [[WordPress:Function Reference/get post meta|get_post_meta()]], [[WordPress:Function Reference/update post meta|update_post_meta()]], [[WordPress:Function Reference/get post custom|get_post_custom()]], [[WordPress:Function Reference/get post custom values|get_post_custom_values()]], [[WordPress:Function Reference/get post custom keys|get_post_custom_keys()]]
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[[WordPress:Function Reference/delete post meta|delete_post_meta()]], [[WordPress:Function Reference/get post meta|get_post_meta()]], [[WordPress:Function Reference/update post meta|update_post_meta()]], [[WordPress:Function Reference/get post custom|get_post_custom()]], [[WordPress:Function Reference/get post custom values|get_post_custom_values()]], [[WordPress:Function Reference/get post custom keys|get_post_custom_keys()]]
[[WordPress:Function Reference/delete post meta|delete_post_meta()]], [[WordPress:Function Reference/get post meta|get_post_meta()]], [[WordPress:Function Reference/update post meta|update_post_meta()]], [[WordPress:Function Reference/get post custom|get_post_custom()]], [[WordPress:Function Reference/get post custom values|get_post_custom_values()]], [[WordPress:Function Reference/get post custom keys|get_post_custom_keys()]]

2008年9月24日 (三) 11:28的最新版本

描述[ ]

add_post_meta為某篇文章添加了一個(gè)自定義的（meta）區(qū)。

如果$unique參數(shù)設(shè)置為true而且已經(jīng)存在特別的meta關(guān)鍵詞，函數(shù)返回false而且不做什么更改；否則的話，函數(shù)返回true。

用法[ ]

%%% <?php add_post_meta($post_id, $meta_key, $meta_value, $unique); ?> %%%

例子[ ]

默認(rèn)用法[ ]

<?php add_post_meta($68, 'my_key', 47); ?>

添加或者更新一個(gè)獨(dú)特的區(qū)[ ]

如果你存在關(guān)鍵詞，添加一個(gè)新的field，或者更新現(xiàn)存的field。 

 <?php add_post_meta(7, 'fruit', 'banana', true) 或者update_post_meta(7, 'fruit', 'banana'); ?>

其它的例子[ ]

如果你想要確定沒有帶有關(guān)鍵字"my_key"的fieled，添加之前：

<?php add_post_meta(68, 'my_key', '47', true); ?> To add several values to the key "my_key": 

<?php add_post_meta(68, 'my_key', '47'); ?>
<?php add_post_meta(68, 'my_key', '682'); ?>
<?php add_post_meta(68, 'my_key', 'The quick, brown fox jumped over the lazy dog.'); ?>
...

更詳細(xì)的例子，請(qǐng)進(jìn)入post_meta 函數(shù)例子網(wǎng)頁。

制作一個(gè) "隱藏的" 自定義區(qū)[ ]

如果你是一個(gè)插件/主題開發(fā)人員而且你計(jì)劃使用自定義field儲(chǔ)存與你的插件或者主題相關(guān)的參數(shù)，你會(huì)饒有興趣地發(fā)現(xiàn)，WordPress習(xí)慣于顯示網(wǎng)頁/文章編輯網(wǎng)頁中自定義field列表上以"_"（下劃線）開始的關(guān)鍵字。就是說，在自定義參數(shù)中將下劃線設(shè)置為第一個(gè)字符，是個(gè)很好的做法，這樣你可以將設(shè)置儲(chǔ)存為自定義fields，但是你的設(shè)置不會(huì)在管理UI中的自定義fields列表中顯示。

下面的例子：

<?php add_post_meta(68, '_color', 'red', true); ?> 會(huì)添加一個(gè)關(guān)鍵字是 "_color" 的自定義范圍而且這個(gè)自定義范圍中的參數(shù)值"red"不會(huì)在網(wǎng)頁/文章編輯網(wǎng)頁中顯示。

參數(shù)[ ]

相關(guān)的[ ]

delete_post_meta(), get_post_meta(), update_post_meta(), get_post_custom(), get_post_custom_values(), get_post_custom_keys()

delete_post_meta(), get_post_meta(), update_post_meta(), get_post_custom(), get_post_custom_values(), get_post_custom_keys()