How reliable is filtering search engines based on user agent names compared to using IP addresses in PHP code?

Filtering search engines based on user agent names is less reliable compared to using IP addresses in PHP code because user agent names can be easily spoofed or changed by malicious users. Using IP addresses provides a more secure and accurate way to identify and filter search engine bots. 

// Get the user's IP address
$user_ip = $_SERVER['REMOTE_ADDR'];

// List of known search engine bot IP addresses
$bot_ips = array('123.456.789.1', '234.567.890.2');

// Check if the user's IP address matches any of the known bot IPs
if (in_array($user_ip, $bot_ips)) {
    // User is identified as a search engine bot
    // Perform necessary actions here
} else {
    // User is not a search engine bot
    // Proceed with regular code execution
}

Keywords

filtering search engines user agent names IP addresses PHP code

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