How can PHP scripts be optimized to work seamlessly across different server configurations?

PHP scripts can be optimized to work seamlessly across different server configurations by using server-agnostic functions and avoiding server-specific configurations. This can be achieved by using built-in PHP functions instead of relying on server-specific extensions, ensuring compatibility with various PHP versions, and testing the script on different server environments to identify and address any compatibility issues. 

// Example of using server-agnostic functions
$filename = 'example.txt';
if (file_exists($filename)) {
    echo "File $filename exists.";
} else {
    echo "File $filename does not exist.";
}

Keywords

PHP scripts optimization server configurations compatibility performance.

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