device (mobile vs desktop) based smart website redirecting with htaccess and cookies

.htaccess

# Instruction
# mobile site: m.example.com
# desktop site: example.com
# use query string target=mobile to enforce a mobile view on mobile site on desktop (set once and store in cookie)
# use query string target=desktop to enforce a desktop view on desktop site on mobile (set once and store in cookie)
# use query string target=default to reset view preference to default

RewriteEngine On

# Checks query string for target, sets cookie and refresh 

# Check if target=default
RewriteCond %{QUERY_STRING} target=default [NC]
RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI}? [CO=target:default:%{HTTP_HOST},L,R=302]

# Check if target=mobile
RewriteCond %{QUERY_STRING} target=mobile [NC]
RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI}? [CO=target:mobile:%{HTTP_HOST},L,R=302]

# Check if target=desktop
RewriteCond %{QUERY_STRING} target=desktop [NC]
RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI}? [CO=target:desktop:%{HTTP_HOST},L,R=302]

# Redirect Rule for desktop and !target=mobile on mobile site
# Redirects desktop traffic to desktop site unless cookie target=mobile

# for mobile site only
RewriteCond %{HTTP_HOST} ^m\.example\.com [NC]

# Check if is desktop
RewriteCond %{HTTP_USER_AGENT} !(android|bb\d+|meego).+mobile|avantgo|bada/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge\ |maemo|midp|mmp|netfront|opera\ m(ob|in)i|palm(\ os)?|phone|p(ixi|re)/|plucker|pocket|psp|series(4|6)0|symbian|treo|up.(browser|link)|vodafone|wap|windows\ (ce|phone)|xda|xiino [NC]
RewriteCond %{HTTP_USER_AGENT} !^(1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a\ wa|abac|ac(er|oo|s-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|-m|r\ |s\ )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw-(n|u)|c55/|capi|ccwa|cdm-|cell|chtm|cldc|cmd-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc-s|devi|dica|dmob|do(c|p)o|ds(12|-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(-|)|g1\ u|g560|gene|gf-5|g-mo|go(.w|od)|gr(ad|un)|haie|hcit|hd-(m|p|t)|hei-|hi(pt|ta)|hp(\ i|ip)|hs-c|ht(c(-|\ ||a|g|p|s|t)|tp)|hu(aw|tc)|i-(20|go|ma)|i230|iac(\ |-|/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt(\ |/)|klon|kpt\ |kwc-|kyo(c|k)|le(no|xi)|lg(\ g|/(k|l|u)|50|54|-[a-w])|libw|lynx|m1-w|m3ga|m50/|ma(te|ui|xo)|mc(01|21|ca)|m-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(-|\ |o|v)|zz)|mt(50|p1|v\ )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|-([1-8]|c))|phil|pire|pl(ay|uc)|pn-2|po(ck|rt|se)|prox|psio|pt-g|qa-a|qc(07|12|21|32|60|-[2-7]|i-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55/|sa(ge|ma|mm|ms|ny|va)|sc(01|h-|oo|p-)|sdk/|se(c(-|0|1)|47|mc|nd|ri)|sgh-|shar|sie(-|m)|sk-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h-|v-|v\ )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl-|tdg-|tel(i|m)|tim-|t-mo|to(pl|sh)|ts(70|m-|m3|m5)|tx-9|up(.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(-|\ )|webc|whit|wi(g\ |nc|nw)|wmlb|wonu|x700|yas-|your|zeto|zte-) [NC]

# and check cookie target is not set to mobile
RewriteCond %{HTTP_COOKIE} !target=mobile [NC]

RewriteRule ^(.*)$ http://example.com/?target=desktop [L,R=302]




# Redirect Rule for mobile and !target=desktop on desktop site
# Redirects mobile traffic to mobile site unless cookie target=desktop

# for desktop site only
RewriteCond %{HTTP_HOST} ^example\.com [NC]

# Check if is desktop
RewriteCond %{HTTP_USER_AGENT} (android|bb\d+|meego).+mobile|avantgo|bada/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge\ |maemo|midp|mmp|netfront|opera\ m(ob|in)i|palm(\ os)?|phone|p(ixi|re)/|plucker|pocket|psp|series(4|6)0|symbian|treo|up.(browser|link)|vodafone|wap|windows\ (ce|phone)|xda|xiino [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a\ wa|abac|ac(er|oo|s-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|-m|r\ |s\ )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw-(n|u)|c55/|capi|ccwa|cdm-|cell|chtm|cldc|cmd-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc-s|devi|dica|dmob|do(c|p)o|ds(12|-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(-|)|g1\ u|g560|gene|gf-5|g-mo|go(.w|od)|gr(ad|un)|haie|hcit|hd-(m|p|t)|hei-|hi(pt|ta)|hp(\ i|ip)|hs-c|ht(c(-|\ ||a|g|p|s|t)|tp)|hu(aw|tc)|i-(20|go|ma)|i230|iac(\ |-|/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt(\ |/)|klon|kpt\ |kwc-|kyo(c|k)|le(no|xi)|lg(\ g|/(k|l|u)|50|54|-[a-w])|libw|lynx|m1-w|m3ga|m50/|ma(te|ui|xo)|mc(01|21|ca)|m-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(-|\ |o|v)|zz)|mt(50|p1|v\ )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|-([1-8]|c))|phil|pire|pl(ay|uc)|pn-2|po(ck|rt|se)|prox|psio|pt-g|qa-a|qc(07|12|21|32|60|-[2-7]|i-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55/|sa(ge|ma|mm|ms|ny|va)|sc(01|h-|oo|p-)|sdk/|se(c(-|0|1)|47|mc|nd|ri)|sgh-|shar|sie(-|m)|sk-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h-|v-|v\ )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl-|tdg-|tel(i|m)|tim-|t-mo|to(pl|sh)|ts(70|m-|m3|m5)|tx-9|up(.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(-|\ )|webc|whit|wi(g\ |nc|nw)|wmlb|wonu|x700|yas-|your|zeto|zte-) [NC]

# and check cookie target is not set to desktop
RewriteCond %{HTTP_COOKIE} !target=desktop [NC]

RewriteRule ^(.*)$ http://m.example.com/?target=mobile [L,R=302]