Code Modernization: Bootstrap/Load: Use null coalescing operator instead of isset() ternaries.

Developed as a subset of #10654
Initially developed in #4886

Follow-up to [61442], [61436], [61435], [61434], [61403], [61433], [61432], [61431], [61430], [61429], [61424], [61404], [61403].

Props costdev, westonruter.
See #58874, #63430.


git-svn-id: https://develop.svn.wordpress.org/trunk@61443 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-includes/class-wp-paused-extensions-storage.php

@@ -161,7 +161,7 @@ public function get_all() {
 
 		$paused_extensions = (array) get_option( $option_name, array() );
 
-		return isset( $paused_extensions[ $this->type ] ) ? $paused_extensions[ $this->type ] : array();
+		return $paused_extensions[ $this->type ] ?? array();
 	}
 
 	/**

src/wp-includes/error-protection.php

@@ -46,7 +46,7 @@ function wp_paused_themes() {
  */
 function wp_get_extension_error_description( $error ) {
 	$constants   = get_defined_constants( true );
-	$constants   = isset( $constants['Core'] ) ? $constants['Core'] : $constants['internal'];
+	$constants   = $constants['Core'] ?? $constants['internal'];
 	$core_errors = array();
 
 	foreach ( $constants as $constant => $value ) {

src/wp-includes/load.php

@@ -13,7 +13,7 @@
  * @return string The HTTP protocol. Default: HTTP/1.0.
  */
 function wp_get_server_protocol() {
-	$protocol = isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : '';
+	$protocol = $_SERVER['SERVER_PROTOCOL'] ?? '';
 
 	if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0', 'HTTP/3' ), true ) ) {
 		$protocol = 'HTTP/1.0';
@@ -115,7 +115,7 @@ function wp_populate_basic_auth_from_authorization_header() {
 	}
 
 	// From our prior conditional, one of these must be set.
-	$header = isset( $_SERVER['HTTP_AUTHORIZATION'] ) ? $_SERVER['HTTP_AUTHORIZATION'] : $_SERVER['REDIRECT_HTTP_AUTHORIZATION'];
+	$header = $_SERVER['HTTP_AUTHORIZATION'] ?? $_SERVER['REDIRECT_HTTP_AUTHORIZATION'];
 
 	// Test to make sure the pattern matches expected.
 	if ( ! preg_match( '%^Basic [a-z\d/+]*={0,2}$%i', $header ) ) {