Fix TypeError in number_format() when handling empty string post views

[Copilot]

This PR fixes a Fatal error that occurs when the post views functionality encounters empty or invalid data in PHP 8+. The issue manifests as:

Fatal error: Uncaught TypeError: number_format(): Argument #1 ($num) must be of type int|float, string given in /wp-content/themes/Sakurairo/functions.php:764

Problem

The get_post_views() function calls restyle_text() which directly passes values to PHP's number_format() function. When post view metadata contains empty strings, null values, or other non-numeric data, number_format() throws a TypeError in PHP 8+ due to stricter type checking.

This causes:

• Fatal errors when creating/updating posts
• Blank homepage display
• "此响应不是合法的 JSON 响应" errors in WordPress admin

Solution

Enhanced restyle_text() function:

• Added is_numeric() check to validate input before formatting
• Non-numeric values (empty strings, null, invalid data) are converted to 0
• Prevents TypeError while maintaining expected behavior

Improved get_post_views() function:

• Added input validation and type casting for post IDs
• Added protection against invalid views metadata
• Changed error return from inconsistent string to integer 0
• Used strict comparison operators for better type safety

Testing

The fix has been thoroughly tested with various edge cases:

• Empty strings: '' → '0'
• Null values: null → '0'
• Invalid data: 'invalid' → '0'
• Valid numbers: 1234 → '1,234' (formatted correctly)

All formatting types (type_1 through type_4) work correctly with the fix.

Fixes #1326.

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此 PR 由于被标记为 stale 且超过 10 天没有活动，已自动关闭。