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I am trying to configure WordPress 5.9 to allow numeric slugs for child pages. Drawing from the 2015 answer to a similar question I took the up-to-date code of wp_unique_post_slug, removed || preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug ) and then added it as the following hook to my theme's functions.php. But for some reason, I just get a critical error: "Allowed memory size exhausted". What can I do to allow numeric slugs for child pages?
add_filter( 'wp_unique_post_slug', function ( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ), true )
|| ( 'inherit' === $post_status && 'revision' === $post_type ) || 'user_request' === $post_type
) {
return $slug;
}
/**
* Filters the post slug before it is generated to be unique.
*
* Returning a non-null value will short-circuit the
* unique slug generation, returning the passed value instead.
*
* @since 5.1.0
*
* @param string|null $override_slug Short-circuit return value.
* @param string $slug The desired slug (post_name).
* @param int $post_ID Post ID.
* @param string $post_status The post status.
* @param string $post_type Post type.
* @param int $post_parent Post parent ID.
*/
$override_slug = apply_filters( 'pre_wp_unique_post_slug', null, $slug, $post_ID, $post_status, $post_type, $post_parent );
if ( null !== $override_slug ) {
return $override_slug;
}
global $wpdb, $wp_rewrite;
$original_slug = $slug;
$feeds = $wp_rewrite->feeds;
if ( ! is_array( $feeds ) ) {
$feeds = array();
}
if ( 'attachment' === $post_type ) {
// Attachment slugs must be unique across all types.
$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );
/**
* Filters whether the post slug would make a bad attachment slug.
*
* @since 3.1.0
*
* @param bool $bad_slug Whether the slug would be bad as an attachment slug.
* @param string $slug The post slug.
*/
$is_bad_attachment_slug = apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug );
if ( $post_name_check
|| in_array( $slug, $feeds, true ) || 'embed' === $slug
|| $is_bad_attachment_slug
) {
$suffix = 2;
do {
$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
$suffix++;
} while ( $post_name_check );
$slug = $alt_post_name;
}
} elseif ( is_post_type_hierarchical( $post_type ) ) {
if ( 'nav_menu_item' === $post_type ) {
return $slug;
}
/*
* Page slugs must be unique within their own trees. Pages are in a separate
* namespace than posts so page slugs are allowed to overlap post slugs.
*/
$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );
/**
* Filters whether the post slug would make a bad hierarchical post slug.
*
* @since 3.1.0
*
* @param bool $bad_slug Whether the post slug would be bad in a hierarchical post context.
* @param string $slug The post slug.
* @param string $post_type Post type.
* @param int $post_parent Post parent ID.
*/
$is_bad_hierarchical_slug = apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent );
if ( $post_name_check
|| in_array( $slug, $feeds, true ) || 'embed' === $slug
|| $is_bad_hierarchical_slug
) {
$suffix = 2;
do {
$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID, $post_parent ) );
$suffix++;
} while ( $post_name_check );
$slug = $alt_post_name;
}
} else {
// Post slugs must be unique across all posts.
$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );
$post = get_post( $post_ID );
// Prevent new post slugs that could result in URLs that conflict with date archives.
$conflicts_with_date_archive = false;
if ( 'post' === $post_type && ( ! $post || $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) ) {
$slug_num = (int) $slug;
if ( $slug_num ) {
$permastructs = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
$postname_index = array_search( '%postname%', $permastructs, true );
/*
* Potential date clashes are as follows:
*
* - Any integer in the first permastruct position could be a year.
* - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
* - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
*/
if ( 0 === $postname_index ||
( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) ||
( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
) {
$conflicts_with_date_archive = true;
}
}
}
/**
* Filters whether the post slug would be bad as a flat slug.
*
* @since 3.1.0
*
* @param bool $bad_slug Whether the post slug would be bad as a flat slug.
* @param string $slug The post slug.
* @param string $post_type Post type.
*/
$is_bad_flat_slug = apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type );
if ( $post_name_check
|| in_array( $slug, $feeds, true ) || 'embed' === $slug
|| $conflicts_with_date_archive
|| $is_bad_flat_slug
) {
$suffix = 2;
do {
$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
$suffix++;
} while ( $post_name_check );
$slug = $alt_post_name;
}
}
/**
* Filters the unique post slug.
*
* @since 3.3.0
*
* @param string $slug The post slug.
* @param int $post_ID Post ID.
* @param string $post_status The post status.
* @param string $post_type Post type.
* @param int $post_parent Post parent ID
* @param string $original_slug The original post slug.
*/
return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
}, 10, 6 );
I am trying to configure WordPress 5.9 to allow numeric slugs for child pages. Drawing from the 2015 answer to a similar question I took the up-to-date code of wp_unique_post_slug, removed || preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug ) and then added it as the following hook to my theme's functions.php. But for some reason, I just get a critical error: "Allowed memory size exhausted". What can I do to allow numeric slugs for child pages?
add_filter( 'wp_unique_post_slug', function ( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ), true )
|| ( 'inherit' === $post_status && 'revision' === $post_type ) || 'user_request' === $post_type
) {
return $slug;
}
/**
* Filters the post slug before it is generated to be unique.
*
* Returning a non-null value will short-circuit the
* unique slug generation, returning the passed value instead.
*
* @since 5.1.0
*
* @param string|null $override_slug Short-circuit return value.
* @param string $slug The desired slug (post_name).
* @param int $post_ID Post ID.
* @param string $post_status The post status.
* @param string $post_type Post type.
* @param int $post_parent Post parent ID.
*/
$override_slug = apply_filters( 'pre_wp_unique_post_slug', null, $slug, $post_ID, $post_status, $post_type, $post_parent );
if ( null !== $override_slug ) {
return $override_slug;
}
global $wpdb, $wp_rewrite;
$original_slug = $slug;
$feeds = $wp_rewrite->feeds;
if ( ! is_array( $feeds ) ) {
$feeds = array();
}
if ( 'attachment' === $post_type ) {
// Attachment slugs must be unique across all types.
$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );
/**
* Filters whether the post slug would make a bad attachment slug.
*
* @since 3.1.0
*
* @param bool $bad_slug Whether the slug would be bad as an attachment slug.
* @param string $slug The post slug.
*/
$is_bad_attachment_slug = apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug );
if ( $post_name_check
|| in_array( $slug, $feeds, true ) || 'embed' === $slug
|| $is_bad_attachment_slug
) {
$suffix = 2;
do {
$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
$suffix++;
} while ( $post_name_check );
$slug = $alt_post_name;
}
} elseif ( is_post_type_hierarchical( $post_type ) ) {
if ( 'nav_menu_item' === $post_type ) {
return $slug;
}
/*
* Page slugs must be unique within their own trees. Pages are in a separate
* namespace than posts so page slugs are allowed to overlap post slugs.
*/
$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );
/**
* Filters whether the post slug would make a bad hierarchical post slug.
*
* @since 3.1.0
*
* @param bool $bad_slug Whether the post slug would be bad in a hierarchical post context.
* @param string $slug The post slug.
* @param string $post_type Post type.
* @param int $post_parent Post parent ID.
*/
$is_bad_hierarchical_slug = apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent );
if ( $post_name_check
|| in_array( $slug, $feeds, true ) || 'embed' === $slug
|| $is_bad_hierarchical_slug
) {
$suffix = 2;
do {
$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID, $post_parent ) );
$suffix++;
} while ( $post_name_check );
$slug = $alt_post_name;
}
} else {
// Post slugs must be unique across all posts.
$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );
$post = get_post( $post_ID );
// Prevent new post slugs that could result in URLs that conflict with date archives.
$conflicts_with_date_archive = false;
if ( 'post' === $post_type && ( ! $post || $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) ) {
$slug_num = (int) $slug;
if ( $slug_num ) {
$permastructs = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
$postname_index = array_search( '%postname%', $permastructs, true );
/*
* Potential date clashes are as follows:
*
* - Any integer in the first permastruct position could be a year.
* - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
* - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
*/
if ( 0 === $postname_index ||
( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) ||
( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
) {
$conflicts_with_date_archive = true;
}
}
}
/**
* Filters whether the post slug would be bad as a flat slug.
*
* @since 3.1.0
*
* @param bool $bad_slug Whether the post slug would be bad as a flat slug.
* @param string $slug The post slug.
* @param string $post_type Post type.
*/
$is_bad_flat_slug = apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type );
if ( $post_name_check
|| in_array( $slug, $feeds, true ) || 'embed' === $slug
|| $conflicts_with_date_archive
|| $is_bad_flat_slug
) {
$suffix = 2;
do {
$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
$suffix++;
} while ( $post_name_check );
$slug = $alt_post_name;
}
}
/**
* Filters the unique post slug.
*
* @since 3.3.0
*
* @param string $slug The post slug.
* @param int $post_ID Post ID.
* @param string $post_status The post status.
* @param string $post_type Post type.
* @param int $post_parent Post parent ID
* @param string $original_slug The original post slug.
*/
return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
}, 10, 6 );
1 Answer
Reset to default 2 +50Updated Answer — @Quasimodo confirmed that they're only interested in posts of the page type and that the numeric slugs are four-digit years, e.g. 2019.
What can I do to allow numeric slugs for child pages?
I would use the pre_wp_unique_post_slug hook that runs prior to wp_unique_post_slug, which means we'll be filtering the slug before a unique one is generated (by WordPress), and thus our callback must be able to generate a unique slug if necessary.
Here's an example, tried and tested working with WordPress v5.9.3:
add_filter( 'pre_wp_unique_post_slug', 'my_pre_wp_unique_post_slug', 10, 6 );
function my_pre_wp_unique_post_slug( $override_slug, $slug, $post_ID, $post_status, $post_type, $post_parent ) {
$allowed_post_status = array( 'publish', 'private' ); // allows numerical slug only for these statuses
if ( preg_match( '/^\d{4}$/', $slug ) && $post_parent &&
'page' === $post_type && in_array( $post_status, $allowed_post_status )
) {
return my_unique_page_slug( $slug, $post_ID, $post_type );
}
return $override_slug;
}
// This function is based on the code in the wp_unique_post_slug() function, lines
// 5023-5054 in WordPress v5.9.3, except that $check_sql doesn't include the `AND post_parent = %d`,
// which means we only want unique slug for each Page (i.e. post of type 'page').
function my_unique_page_slug( $slug, $post_ID, $post_type = 'page' ) {
global $wpdb;
$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d LIMIT 1";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );
if ( $post_name_check ) {
$suffix = 2;
do {
$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
$suffix++;
} while ( $post_name_check );
$slug = $alt_post_name;
}
return $slug;
}
PS: Just so that you know, the wp_unique_post_slug hook could be used, but your callback would need to return or work on the value of $original_slug (last parameter from the hook) instead of $slug (first parameter from the hook).
So the above example would now let us use a number as the slug for child Pages (post type page), however, we still need to ensure the URL/permalink works as expected — because by default, example.com/page-slug/<number> is treated as a paginated request and thus WordPress will attempt to load page 2, 3, etc. of the Page with the slug page-slug.
- The above also explains why WordPress by default disallows number as a (post) slug.
So step 2 for you would be this — add a custom rewrite rule which ensures the permalink example.com/parent-slug/<number> loads the Page with the slug <number> and is child of parent-slug (or whatever the correct/actual slug is):
add_action( 'init', 'my_add_page_rewrite_rules' );
function my_add_page_rewrite_rules() {
add_rewrite_rule(
'^(.+/\d{4})(?:/(\d+))?/?$',
'index.php?pagename=$matches[1]&page=$matches[2]',
'top' );
}
Or you can instead use the page_rewrite_rules hook:
add_filter( 'page_rewrite_rules', 'my_page_rewrite_rules' );
function my_page_rewrite_rules( $page_rewrite ) {
return array(
'^(.+/\d{4})(?:/(\d+))?/?$' => 'index.php?pagename=$matches[1]&page=$matches[2]',
) + $page_rewrite;
}
And remember, there's a step 3 — flush the rewrite rules by simply visiting wp-admin → Settings → Permalinks.
As for this:
But for some reason, I just get a critical error: "Allowed memory size exhausted".
That's because, as @birgire said in his comment, "you're creating an infinite loop by re-applying the wp_unique_post_slug filter in the end of your callback".
So whenever wp_unique_post_slug() got called (e.g. by wp_insert_post()),
apply_filters()(inwp_unique_post_slug()) called your closure/callback- Your callback called
apply_filters() apply_filters()(in your callback) called your callback- Steps 2 & 3 were repeated over and over again...
And eventually, PHP threw a fatal/critical error because your code consumed way too much memory.. :/
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wp_unique_post_slugfilter in the end of your callback. – birgire Commented May 16, 2022 at 17:22-2when changing the permalink. – Quasimodo Commented May 17, 2022 at 7:31