Code Modernization: Remove obsolete comments about older PHP versions.

This commit:
* Removes various comments referencing PHP versions which are no longer supported.
* Removes various comments containing “hints” of things to do after a particular PHP version drop. These hints are incorrect/not actionable for various reasons, so have no value:
 * Even though a function could be turned into a closure, removing the function would be a backward compatibility break which is not acceptable, so this suggestion is not actionable.
 * Short ternaries are forbidden by the coding standard exactly to prevent the faulty code suggested in the comment from getting into the codebase.

Follow-up to [1243/tests], [6543], [11816], [29861], [29864], [34928], [35369], [36698], [38694], [50786], [58678].

Props jrf, ayeshrajans.
See #61574.

git-svn-id: https://develop.svn.wordpress.org/trunk@58682 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/meta-boxes.php

@@ -1270,7 +1270,7 @@ function xfn_check( $xfn_relationship, $xfn_value = '', $deprecated = '' ) {
 		_deprecated_argument( __FUNCTION__, '2.5.0' ); // Never implemented.
 	}
 
-	$link_rel  = isset( $link->link_rel ) ? $link->link_rel : ''; // In PHP 5.3: $link_rel = $link->link_rel ?: '';
+	$link_rel  = isset( $link->link_rel ) ? $link->link_rel : '';
 	$link_rels = preg_split( '/\s+/', $link_rel );
 
 	// Mark the specified value as checked if it matches the current link's relationship.

src/wp-includes/class-wp-customize-manager.php

@@ -6141,8 +6141,7 @@ public function _sanitize_external_header_video( $value ) {
 	 * This method exists because the partial object and context data are passed
 	 * into a partial's render_callback so we cannot use get_custom_logo() as
 	 * the render_callback directly since it expects a blog ID as the first
-	 * argument. When WP no longer supports PHP 5.3, this method can be removed
-	 * in favor of an anonymous function.
+	 * argument.
 	 *
 	 * @see WP_Customize_Manager::register_controls()
 	 *

src/wp-includes/class-wp-object-cache.php

@@ -73,7 +73,7 @@ class WP_Object_Cache {
 	private $multisite;
 
 	/**
-	 * Sets up object properties; PHP 5 style constructor.
+	 * Sets up object properties.
 	 *
 	 * @since 2.0.8
 	 */

src/wp-includes/http.php

@@ -699,12 +699,8 @@ function ms_allowed_http_request_hosts( $is_external, $host ) {
  * A wrapper for PHP's parse_url() function that handles consistency in the return values
  * across PHP versions.
  *
- * PHP 5.4.7 expanded parse_url()'s ability to handle non-absolute URLs, including
- * schemeless and relative URLs with "://" in the path. This function works around
- * those limitations providing a standard output on PHP 5.2~5.4+.
- *
- * Secondly, across various PHP versions, schemeless URLs containing a ":" in the query
- * are being handled inconsistently. This function works around those differences as well.
+ * Across various PHP versions, schemeless URLs containing a ":" in the query
+ * are being handled inconsistently. This function works around those differences.
  *
  * @since 4.4.0
  * @since 4.7.0 The `$component` parameter was added for parity with PHP's `parse_url()`.

src/wp-includes/load.php

@@ -453,8 +453,6 @@ function wp_is_maintenance_mode() {
 /**
  * Gets the time elapsed so far during this PHP script.
  *
- * Uses REQUEST_TIME_FLOAT that appeared in PHP 5.4.0.
- *
  * @since 5.8.0
  *
  * @return float Seconds since the PHP script started.

src/wp-includes/rest-api/class-wp-rest-request.php

@@ -709,7 +709,7 @@ protected function parse_json_params() {
 	 * Parses the request body parameters.
 	 *
 	 * Parses out URL-encoded bodies for request methods that aren't supported
-	 * natively by PHP. In PHP 5.x, only POST has these parsed automatically.
+	 * natively by PHP.
 	 *
 	 * @since 4.4.0
 	 */

tests/phpunit/tests/formatting/escTextarea.php

@@ -12,7 +12,6 @@ public function charset_iso_8859_1() {
 	}
 
 	/*
-	 * Only fails in PHP 5.4 onwards
 	 * @ticket 23688
 	 */
 	public function test_esc_textarea_charset_iso_8859_1() {

tests/phpunit/tests/formatting/wpHtmleditPre.php

@@ -13,7 +13,6 @@ public function charset_iso_8859_1() {
 	}
 
 	/*
-	 * Only fails in PHP 5.4 onwards
 	 * @ticket 23688
 	 */
 	public function test_wp_htmledit_pre_charset_iso_8859_1() {

tests/phpunit/tests/formatting/wpRicheditPre.php

@@ -13,7 +13,6 @@ public function charset_iso_8859_1() {
 	}
 
 	/*
-	 * Only fails in PHP 5.4 onwards
 	 * @ticket 23688
 	 */
 	public function test_wp_richedit_pre_charset_iso_8859_1() {

tests/phpunit/tests/http/http.php

@@ -114,7 +114,7 @@ public function data_wp_parse_url() {
 				),
 			),
 
-			// < PHP 5.4.7: Schemeless URL.
+			// Schemeless URL.
 			array(
 				'//example.com/path/',
 				array(
@@ -138,7 +138,7 @@ public function data_wp_parse_url() {
 				),
 			),
 
-			// < PHP 5.4.7: Scheme separator in the URL.
+			// Scheme separator in the URL.
 			array(
 				'http://example.com/http://example.net/',
 				array(
@@ -149,7 +149,7 @@ public function data_wp_parse_url() {
 			),
 			array( '/path/http://example.net/', array( 'path' => '/path/http://example.net/' ) ),
 
-			// < PHP 5.4.7: IPv6 literals in schemeless URLs are handled incorrectly.
+			// IPv6 literals in schemeless URLs.
 			array(
 				'//[::FFFF::127.0.0.1]/',
 				array(
@@ -238,21 +238,21 @@ public function data_wp_parse_url_with_component() {
 			array( self::FULL_TEST_URL, PHP_URL_QUERY, 'arg1=value1&arg2=value2' ),
 			array( self::FULL_TEST_URL, PHP_URL_FRAGMENT, 'anchor' ),
 
-			// < PHP 5.4.7: Schemeless URL.
+			// Schemeless URL.
 			array( '//example.com/path/', PHP_URL_HOST, 'example.com' ),
 			array( '//example.com/path/', PHP_URL_PATH, '/path/' ),
 			array( '//example.com/', PHP_URL_HOST, 'example.com' ),
 			array( '//example.com/', PHP_URL_PATH, '/' ),
 			array( 'http://example.com//path/', PHP_URL_HOST, 'example.com' ),
 			array( 'http://example.com//path/', PHP_URL_PATH, '//path/' ),
 
-			// < PHP 5.4.7: Scheme separator in the URL.
+			// Scheme separator in the URL.
 			array( 'http://example.com/http://example.net/', PHP_URL_HOST, 'example.com' ),
 			array( 'http://example.com/http://example.net/', PHP_URL_PATH, '/http://example.net/' ),
 			array( '/path/http://example.net/', PHP_URL_HOST, null ),
 			array( '/path/http://example.net/', PHP_URL_PATH, '/path/http://example.net/' ),
 
-			// < PHP 5.4.7: IPv6 literals in schemeless URLs are handled incorrectly.
+			// IPv6 literals in schemeless URLs.
 			array( '//[::FFFF::127.0.0.1]/', PHP_URL_HOST, '[::FFFF::127.0.0.1]' ),
 			array( '//[::FFFF::127.0.0.1]/', PHP_URL_PATH, '/' ),