Performance/LowExpiryCacheTime: add support for PHP 7.4+ numeric literals and 8.1+ octal literals

While PHPCS fully supports these syntaxes at the tokenizer level, this sniff includes the contents of the found token in a string which will be run through `eval()`, which means that if the number was originally provided in a PHP 7.4+ syntax and the sniffs are run on PHP 7.2, the `eval` will result in a fatal error, breaking the sniff (and possibly the PHPCS run).

By using the PHPCSUtils `Numbers` class, we can bypass this and retrieve the decimal value of a integer/float, no matter in what syntax the number is provided. If we then use the decimal value in the string which will be run through `eval()`, the potential fatal error is avoided.

Includes tests.

Author: jrfnl

WordPressVIPMinimum/Sniffs/Performance/LowExpiryCacheTimeSniff.php

@@ -10,6 +10,7 @@
 namespace WordPressVIPMinimum\Sniffs\Performance;
 
 use PHP_CodeSniffer\Util\Tokens;
+use PHPCSUtils\Utils\Numbers;
 use PHPCSUtils\Utils\TextStrings;
 use WordPressCS\WordPress\AbstractFunctionParameterSniff;
 
@@ -104,8 +105,10 @@ public function process_parameters( $stackPtr, $group_name, $matched_content, $p
 			if ( $this->tokens[ $i ]['code'] === T_LNUMBER
 				|| $this->tokens[ $i ]['code'] === T_DNUMBER
 			) {
-				// Integer or float.
-				$tokensAsString .= $this->tokens[ $i ]['content'];
+				// Make sure that PHP 7.4 numeric literals and PHP 8.1 explicit octals don't cause problems.
+				$number_info     = Numbers::getCompleteNumber( $this->phpcsFile, $i );
+				$tokensAsString .= $number_info['decimal'];
+				$i               = $number_info['last_token'];
 				continue;
 			}