WordPress/wp-includes/post-image-template.php

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<?php
/**
* WordPress Post Image Template Functions.
*
* Support for post thumbnails
* Themes function.php must call add_theme_support( 'post-thumbnails' ) to use these.
*
* @package WordPress
* @subpackage Template
*/
function has_post_image( $post_id = NULL ) {
global $id;
$post_id = ( NULL === $post_id ) ? $id : $post_id;
return !! get_post_image_id( $post_id );
}
function get_post_image_id( $post_id = NULL ) {
global $id;
$post_id = ( NULL === $post_id ) ? $id : $post_id;
return get_post_meta( $post_id, '_thumbnail_id', true );
}
function the_post_image( $size = 'thumbnail', $attr = '' ) {
echo get_the_post_image( NULL, $size, $attr );
}
function get_the_post_image( $post_id = NULL, $size = 'thumbnail', $attr = '' ) {
global $id;
$post_id = ( NULL === $post_id ) ? $id : $post_id;
$post_image_id = get_post_image_id( $post_id );
$size = apply_filters( 'post_image_size', $size );
if ( $post_image_id ) {
do_action( 'begin_fetch_post_image_html', $post_id, $post_image_id, $size ); // for "Just In Time" filtering of all of wp_get_attachment_image()'s filters
$html = wp_get_attachment_image( $post_image_id, $size, false, $attr );
do_action( 'end_fetch_post_image_html', $post_id, $post_image_id, $size );
} else {
$html = '';
}
return apply_filters( 'post_image_html', $html, $post_id, $post_image_id );
}
?>