How To Make Url Search Engine Friendly Making Urls Clean SEO

absolutely this is very supporting site for us i think it is one of the best site. thanks a

Nice site . absolutely this is very useful content nice site. thank you so much

u have given this function function clean_url($text)
{
#### function by webune and wallpaperama
## please do not remove this.. thank you

$text=strtolower($text); = array( '&quot;' ,'!' ,' at ' ,'#' ,'$' ,'%' ,'^' ,'&' ,'*' ,'(' ,')' ,'+' ,'{' ,'}' ,'|' ,':' ,'"' ,'<' ,'>' ,'?' ,'[' ,']' ,'' ,';' ,"'" ,',' ,'.' ,'_' ,'/' ,'*' ,'+' ,'~' ,'`' ,'=' ,' ' ,'---' ,'--','--');
$code_entities_ = array('' ,'-' ,'-' ,'' ,'' ,'' ,'-' ,'-' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'-' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'-' ,'' ,'-' ,'-' ,'' ,'' ,'' ,'' ,'' ,'-' ,'-' ,'-','-');
$text = str_replace($code_entities_match, $code_entities_replace, $text);
return $text;
}
but tell me where and in which file to add this function.

https://www.wallpaperama.com/forums/how-to-make-url-search-engine-friendly-making-urls-clean-seo-t5784.html

i want to ask one thing : we have an already developed site in php and want to make it seo friendly. so where should i make changes to make urls seo friendly? actully i am totally new to seo. so i want to know it in steps.

u have given this function function clean_url($text)
{
#### function by webune and wallpaperama
## please do not remove this.. thank you

$text=strtolower($text); = array( '&quot;' ,'!' ,' at ' ,'#' ,'$' ,'%' ,'^' ,'&' ,'*' ,'(' ,')' ,'+' ,'{' ,'}' ,'|' ,':' ,'"' ,'<' ,'>' ,'?' ,'[' ,']' ,'' ,';' ,"'" ,',' ,'.' ,'_' ,'/' ,'*' ,'+' ,'~' ,'`' ,'=' ,' ' ,'---' ,'--','--');
$code_entities_ = array('' ,'-' ,'-' ,'' ,'' ,'' ,'-' ,'-' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'-' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'-' ,'' ,'-' ,'-' ,'' ,'' ,'' ,'' ,'' ,'-' ,'-' ,'-','-');
$text = str_replace($code_entities_match, $code_entities_replace, $text);
return $text;
}
but tell me where and in which file to add this function.

i want to ask one thing : we have an already developed site in php and want to make it seo friendly. so where should i make changes to make urls seo friendly? actully i am totally new to seo. so i want to know it in steps.