diff --git a/wp-includes/blocks.php b/wp-includes/blocks.php
index c747fe9426..3578b1d25e 100644
--- a/wp-includes/blocks.php
+++ b/wp-includes/blocks.php
@@ -803,7 +803,7 @@ function serialize_blocks( $blocks ) {
 function filter_block_content( $text, $allowed_html = 'post', $allowed_protocols = array() ) {
 	$result = '';
 
-	if ( false !== strpos( $text, '<!--' ) && false !== strpos( $text, '--->' ) ) {
+	if ( str_contains( $text, '<!--' ) && str_contains( $text, '--->' ) ) {
 		$text = preg_replace_callback( '%<!--(.*?)--->%', '_filter_block_content_callback', $text );
 	}
 
diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index dce33c19b2..19abf905b6 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -4463,8 +4463,9 @@ function esc_url( $url, $protocols = null, $_context = 'display' ) {
 	 * it needs http:// prepended (unless it's a relative link
 	 * starting with /, # or ?, or a PHP file).
 	 */
-	if ( strpos( $url, ':' ) === false && ! in_array( $url[0], array( '/', '#', '?' ), true ) &&
-		! preg_match( '/^[a-z0-9-]+?\.php/i', $url ) ) {
+	if ( ! str_contains( $url, ':' ) && ! in_array( $url[0], array( '/', '#', '?' ), true ) &&
+		! preg_match( '/^[a-z0-9-]+?\.php/i', $url )
+	) {
 		$url = 'http://' . $url;
 	}
 
diff --git a/wp-includes/link-template.php b/wp-includes/link-template.php
index 2fe4483a7a..b59a30ad22 100644
--- a/wp-includes/link-template.php
+++ b/wp-includes/link-template.php
@@ -222,7 +222,7 @@ function get_permalink( $post = 0, $leavename = false ) {
 	) {
 
 		$category = '';
-		if ( strpos( $permalink, '%category%' ) !== false ) {
+		if ( str_contains( $permalink, '%category%' ) ) {
 			$cats = get_the_category( $post->ID );
 			if ( $cats ) {
 				$cats = wp_list_sort(
@@ -260,7 +260,7 @@ function get_permalink( $post = 0, $leavename = false ) {
 		}
 
 		$author = '';
-		if ( strpos( $permalink, '%author%' ) !== false ) {
+		if ( str_contains( $permalink, '%author%' ) ) {
 			$authordata = get_userdata( $post->post_author );
 			$author     = $authordata->user_nicename;
 		}
@@ -502,7 +502,7 @@ function get_attachment_link( $post = null, $leavename = false ) {
 			$name = $post->post_name;
 		}
 
-		if ( strpos( $parentlink, '?' ) === false ) {
+		if ( ! str_contains( $parentlink, '?' ) ) {
 			$link = user_trailingslashit( trailingslashit( $parentlink ) . '%postname%' );
 		}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0c7435b0f4..1ef0504fe7 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-56020';
+$wp_version = '6.3-alpha-56021';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.