What server configurations could potentially affect the functionality of PHP code, causing it to work differently in different environments?

Server configurations such as different PHP versions, enabled extensions, and settings like error reporting levels can affect the functionality of PHP code, causing it to work differently in different environments. To ensure consistent behavior, it's important to check and adjust these configurations as needed. 

// Check for a specific PHP extension before using its functions
if (extension_loaded('mysqli')) {
    // Use mysqli functions here
} else {
    // Handle the case when the mysqli extension is not available
}

Keywords

Apache Nginx PHP.ini environment variables error reporting

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