Function Reference/has post thumbnail

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Description

Returns a boolean if a post has a Featured Image (formerly known as Post Thumbnail) attached (true) or not (false).

Note: To enable featured images / post thumbnails, the current theme must include add_theme_support( 'post-thumbnails' ); in its functions.php file. See also Post Thumbnails.

Usage

%%% <?php has_post_thumbnail( $post_id ); ?> %%%

Parameters

ttpost_id/tt
(integer) (optional) Post ID.
Default: 'ID', the post ID.noinclude

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Notes

This template is for standardizing how parameters look in the Function Reference and in Template Tags. Here is an example of this template being called: prenowiki检查到模板循环:模板:Parameter/nowiki/pre 检查到模板循环:模板:Parameter

The usage of this template is below: prenowiki检查到模板循环:模板:Parameter/nowiki/pre Let's take a closer look at the parameters..

name
The name of the parameter.
datatype
The datatype that should be given for this parameter when called.
  • string
  • integer
  • boolean
  • mixed
description
A short description of the parameter.
importance
Set this parameter to optional if the parameter is optional. Otherwise, do not declare this parameter—it defaults to required.
  • required
  • optional
default
If this parameter is optional, ttdefault/tt is the value that will be used if the parameter is not declared.

wordpress.org.cn /div /noinclude

Examples

This example first checks if there is a Post Thumbnail (aka Feature Image) set for the current queried item. If there is a Post Thumbnail set, it returns the Post Thumbnail. If not, it echoes out a default image which should be located in the current theme's image folder (assuming the folder is in the theme's root directory).

<?php
// Must be inside a loop.

if ( has_post_thumbnail() ) {
	the_post_thumbnail();
}
else {
	echo '<img src="' . get_bloginfo( 'stylesheet_directory' ) . '/images/thumbnail-default.jpg" />';
}
?>

Note The above code apparently fails in some instances and the below code is "recommended"

<?php 

if ( '' != get_the_post_thumbnail() ) {
    // some code
} else {
    // some code
}


?>

You can use set_post_thumbnail_size() to set a default size for your thumbnail. Alternatively, you can add new image sizes to the defaults by use add_image_size().

Changelog

Source File

has_post_thumbnail() is located in onlyincludecodewp-includes/post-thumbnail-template.php/code/onlyinclude

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Template Description

Link to the source code on http://core.trac.wordpress.org/browser/.

Parameters

  1. filename
  2. (option) path to codetag/code (version) or codetrunk/code. This option is only used for a new function.br /Default: codetrunk/code -- trunk is the latest bleeding edge development version of WordPress.

Usage

Link to the stable version: pre检查到模板循环:模板:Trac/pre

Link to trunk: pre检查到模板循环:模板:Trac/pre

/div

wordpress.org.cn.

Related

Post Thumbnails: has_post_thumbnail, the_post_thumbnail, get_post_thumbnail_id, get_the_post_thumbnail

includeonlydiv style=clear:both; background-color:#F7F7F7; border:1px solid #CCCCCC; color:#000000; padding:7px; margin:0.5em auto 0.5em auto; vertical-align:middle;See also index of Function Reference and index of Template Tags./div/includeonlynoinclude

Description

This Template is used by Codex:Template Messages.

Usage

pre 检查到模板循环:模板:Message /pre

Result

检查到模板循环:模板:Message

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