How does the [QSA] flag impact the search engine friendliness of URLs in PHP?

The [QSA] flag in Apache's mod_rewrite module allows query string parameters to be appended to the rewritten URL. This can impact search engine friendliness as it can lead to duplicate content issues if not handled properly. To ensure search engine friendly URLs, it's important to properly handle query string parameters in the rewrite rules. 

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]

Keywords

QSA flag search engine friendliness URLs PHP impact

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