replace hyphen with underline htaccess

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How to replace the hyphen next to the number by underline in this URL(htaccess). 

www.site.com.br/post/77-eu_tu_eles
php htaccess

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$url = "www.site.com.br/post/77-eu_tu_eles";

$urlExplode = explode("-",$url);
$urlImplode = implode("_",$urlExplode);

With the function explode( string $delimiter , string $string [, int $limit ]), will return a array, the $delimiter past, in our case is the "-". The $delimiter is used as a parameter for separating string.

And then we use the implode ( string $glue , array $pieces ), where we took the array function returned explode, that is stored in the variable $urlExplode, and spent a $glue to merge the values of the array, which in this case is "_".

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