检查文章或页面是否存在WordPress函数get_page_by_title是为了以防重复建立，如果有多个标题相同的帖子，它将检查最老的发布日期，而不是最小的ID。因为这个函数使用MySQL‘=’比较，$page_title通常与默认排序规则不区分大小写。
get_page_by_title( string $page_title, string $output = OBJECT, string|array $post_type = \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’page\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ )
参数
$page_title
(string) (必须) 页面标题.
$output
(string) (可选) 所需的返回类型。对象之一，数组_A或数组_N，分别对应于WP_POST对象、关联数组或数字数组。
默认值：OBJECT
$post_type
(string|array) (可选) POST类型或POST类型数组。
默认值： ‘page’
返回值
存在返回WP_Post(或数组)，不存在返回NULL。
函数原型
该函数位于wp-includes/post.php，在线地址：https://developer.wordpress.org/reference/files/wp-includes/post.php/
function get_page_by_title( $page_title, $output = OBJECT, $post_type = \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’page\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ ) {
global $wpdb;
if ( is_array( $post_type ) ) {
$post_type = esc_sql( $post_type );
$post_type_in_string = \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\” . implode( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’,\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”, $post_type ) . \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”;
$sql = $wpdb->prepare(
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”
SELECT ID
FROM $wpdb->posts
WHERE post_title = %s
AND post_type IN ($post_type_in_string)
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”,
$page_title
);
} else {
$sql = $wpdb->prepare(
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”
SELECT ID
FROM $wpdb->posts
WHERE post_title = %s
AND post_type = %s
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”,
$page_title,
$post_type
);
}
$page = $wpdb->get_var( $sql );
if ( $page ) {
return get_post( $page, $output );
}
}
如何按标题查找WordPress页面ID，然后替换内容
在本例中，我们找到“SamplePage”的页面id，然后将页面的内容替换为“HelloWorld！”
function my_content($content) {
$page = get_page_by_title( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’Sample Page\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ );
if ( is_page($page->ID) )
$content = \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”Hello World!\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”;
return $content;
}
add_filter(\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’the_content\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’my_content\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’);
如何按标题查找WordPress自定义文章类型
这对于自定义POST类型很有用。以下是自定义类型“link”的$POST数组，标题为“立即实现世界和平”：
$mypost = get_page_by_title(\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’World Peace Now\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, OBJECT, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’link\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’);
print_r($mypost);
在wp_list_Pages中查找用于排除的页面ID
此示例将返回标题为“About”的页的$page对象。然后，在列出页面时，使用$page->id元素排除有关页。
<?php
$page = get_page_by_title( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’About\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ );
wp_list_pages( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’exclude=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ . $page->ID );
?>