WordPress图片自动添加Alt和title教程

WordPress上传图片时图片不会自动添加ALT和TITLE，这样非常不利于SEO优化，手动添加又非常免费。微范儿分享一段WordPress图片自动添加Alt和title方法。

将下面的代码添加到当前主题函数模板functions.php中：

————————代码部分——————————————————————————

add_action( 'add_attachment', 'my_set_image_meta_upon_image_upload' );

function my_set_image_meta_upon_image_upload( $post_ID ) {

// Check if uploaded file is an image, else do nothing

if ( wp_attachment_is_image( $post_ID ) ) {

$my_image_title = get_post( $post_ID )->post_title;

// Sanitize the title:  remove hyphens, underscores & extra spaces:

$my_image_title = preg_replace( '%s*[-_s]+s*%', ' ',  $my_image_title );

// Sanitize the title:  capitalize first letter of every word (other letters lower case):

$my_image_title = ucwords( strtolower( $my_image_title ) );

// Create an array with the image meta (Title, Caption, Description) to be updated

// Note:  comment out the Excerpt/Caption or Content/Description lines if not needed

$my_image_meta = array(

'ID'=> $post_ID,// Specify the image (ID) to be updated

'post_title'=> $my_image_title,// Set image Title to sanitized title

'post_excerpt'=> $my_image_title,// Set image Caption (Excerpt) to sanitized title

'post_content'=> $my_image_title,// Set image Description (Content) to sanitized title

);

// Set the image Alt-Text

update_post_meta( $post_ID, '_wp_attachment_image_alt', $my_image_title );

// Set the image meta (e.g. Title, Excerpt, Content)

wp_update_post( $my_image_meta );

}

}

————————代码部分——————————————————————————

代码可以过滤掉图片名称中的空格等多余元素，对之前上传的图片无效。

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