Code Modernization: Formatting: Use null coalescing operator instead of isset() ternaries.

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

Follow-up to [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@61436 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-includes/formatting.php

@@ -2642,8 +2642,8 @@ function force_balance_tags( $text ) {
 		$tag_name          = $regex[2];
 		$tag               = strtolower( $tag_name );
 		$is_single_tag     = in_array( $tag, $single_tags, true );
-		$pre_attribute_ws  = isset( $regex[4] ) ? $regex[4] : '';
-		$attributes        = trim( isset( $regex[5] ) ? $regex[5] : $regex[3] );
+		$pre_attribute_ws  = $regex[4] ?? '';
+		$attributes        = trim( $regex[5] ?? $regex[3] );
 		$has_self_closer   = str_ends_with( $attributes, '/' );
 
 		$newtext .= $tagqueue;
@@ -5283,10 +5283,10 @@ function wp_sprintf( $pattern, ...$args ) {
 			// Find numbered arguments or take the next one in order.
 			if ( preg_match( '/^%(\d+)\$/', $fragment, $matches ) ) {
 				$index    = $matches[1] - 1; // 0-based array vs 1-based sprintf() arguments.
-				$arg      = isset( $args[ $index ] ) ? $args[ $index ] : '';
+				$arg      = $args[ $index ] ?? '';
 				$fragment = str_replace( "%{$matches[1]}$", '%', $fragment );
 			} else {
-				$arg = isset( $args[ $arg_index ] ) ? $args[ $arg_index ] : '';
+				$arg = $args[ $arg_index ] ?? '';
 				++$arg_index;
 			}
 

src/wp-includes/kses.php

@@ -3033,7 +3033,7 @@ function _wp_kses_allow_pdf_objects( $url ) {
 	// If the URL host matches the current site's media URL, it's safe.
 	$upload_info = wp_upload_dir( null, false );
 	$parsed_url  = wp_parse_url( $upload_info['url'] );
-	$upload_host = isset( $parsed_url['host'] ) ? $parsed_url['host'] : '';
+	$upload_host = $parsed_url['host'] ?? '';
 	$upload_port = isset( $parsed_url['port'] ) ? ':' . $parsed_url['port'] : '';
 
 	if ( str_starts_with( $url, "http://$upload_host$upload_port/" )

src/wp-includes/shortcodes.php

@@ -429,7 +429,7 @@ function do_shortcode_tag( $m ) {
 		return $return;
 	}
 
-	$content = isset( $m[5] ) ? $m[5] : null;
+	$content = $m[5] ?? null;
 
 	$output = $m[1] . call_user_func( $shortcode_tags[ $tag ], $attr, $content, $tag ) . $m[6];