PHP function to get the subdomain of a URL

Question

Is there a function in PHP to get the name of the subdomain    In the following example I would like to get the  en  part of the URL   en example com

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Simply        preg match      http s                              2 5   i    url   match    Just read  match 1  Working example It works perfectly with this list of urls  url   array       http   www domain com      www      http   domain com      --nothing--      https   domain com      --nothing--      www domain com      www      domain com      --nothing--      www domain com some path      www      http   sub domain com domain com      sub                               ua                                       ua      --nothing--      http   sub-domain domain net domain net      sub-domain      sub-domain third-Level DomaIN domain uk co domain net     sub-domain     foreach   url as  u        preg match      http s                              2 5   i    u   match       var dump  match

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domain    sub dev example com    tmp   explode       domain      split into parts  subdomain   current  tmp   print  subdomain          prints  sub    As seen in a previous question  How to get the first subdomain with PHP

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Using regex  string functions  parse url   or their combinations it s not real solution  Just test any of proposed solutions with domain test en example co uk  there will no any correct result   Correct solution is use package that parses domain with Public Suffix List  I recomend TLDExtract  here is sample code    extract   new LayerShifter TLDExtract Extract      result    extract- gt parse  test en example co uk     result- gt getSubdomain       will return  string   test en   result- gt getSubdomains       will return  array    test    en    result- gt getHostname       will return  string   example   result- gt getSuffix       will return  string   co uk

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you can use this too  echo substr   SERVER  HTTP HOST    0  strrpos   SERVER  HTTP HOST         -5

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REFERRER     SERVER  HTTP REFERER       Or other method to get a URL for decomposition   domain   substr  REFERRER  strpos  REFERRER         3    domain   substr  domain  0  strpos  domain            This line will return  en  of  en example com   subdomain   substr  domain  0  strpos  domain

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Try this      domain    en example com    tmp   explode       domain    subdomain   current  tmp   echo  subdomain          echo  en

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Simplest and fastest solution     sSubDomain   str replace   example com       SERVER  HTTP HOST

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PHP 7 0  Using the explode function and create a list of all the results   list  subdomain  host    explode        SERVER  SERVER NAME       Example  sub domain com  echo  subdomain     Result  sub  echo  host    Result  domain

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From PHP 5 3 you can use strstr   with true parameter  echo strstr   SERVER  HTTP HOST         true     prints en

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function get subdomain  url          if  url                url     SERVER  HTTP HOST               parsedUrl   parse url  url        host   explode       parsedUrl  path          subdomains   array slice  host  0  count  host  - 2        return implode       subdomains

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You can do this by first getting the domain name  e g  sub example com    example co uk  and then use strstr to get the subdomains    testArray   array       sub1 sub2 example co uk        sub1 example com        example com        sub1 sub2 sub3 example co uk        sub1 sub2 sub3 example com        sub1 sub2 example com      foreach  testArray as  k   gt   v        echo  k     gt    extract subdomains  v    n      function extract domain  domain        if preg match     P lt domain gt  a-z0-9  a-z0-9 -  1 63    a-z    2 6    i    domain   matches                 return  matches  domain          else           return  domain           function extract subdomains  domain         subdomains    domain       domain   extract domain  subdomains         subdomains   rtrim strstr  subdomains   domain  true              return  subdomains      Outputs   0   gt  sub1 sub2 1   gt  sub1 2   gt  3   gt  sub1 sub2 sub3 4   gt  sub1 sub2 sub3 5   gt  sub1 sub2

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host     SERVER  HTTP HOST    preg match                           host   matches    domain    matches 0    url   explode  domain   host    subdomain   str replace           url 0     echo  subdomain     subdomain   lt br   gt    echo  domain     domain   lt br   gt

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Suppose current url   sub example com         host   array reverse explode        SERVER  SERVER NAME           if  count  host     3          echo  Main domain is      host 1       host 0      subdomain is      host 2             Main domain is   example com   subdomain is   sub       else          echo  Main domain is      host 1       host 0      subdomain not found              Main domain is   example com   subdomain not found

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As the only reliable source for domain suffixes are the domain registrars  you can t find the subdomain without their knowledge  There is a list with all domain suffixes at https   publicsuffix org  This site also links to a PHP library  https   github com jeremykendall php-domain-parser     Please find an example below  I also added the sample for en test co uk which is a domain with a multi suffix  co uk     lt  php  require once  vendor autoload php     pslManager   new Pdp PublicSuffixListManager     parser   new Pdp Parser  pslManager- gt getList      host    http   en example com    url    parser- gt parseUrl  host    echo  url- gt host- gt subdomain     host    http   en test co uk    url    parser- gt parseUrl  host    echo  url- gt host- gt subdomain

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Simply  reset explode        SERVER  HTTP HOST

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What I found the best and short solution is  array shift explode       SERVER  HTTP HOST

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I know I m really late to the game  but here goes   What I did was take the HTTP HOST server variable    SERVER  HTTP HOST    and the number of letters in the domain  so for example com it would be 11    Then I used the substr function to get the subdomain  I did   numberOfLettersInSubdomain   strlen   SERVER  HTTP HOST   -12  subdomain   substr   SERVER  HTTP HOST     numberOfLettersInSubdomain     I cut the substring off at 12 instead of 11 because substrings start on 1 for the second parameter  So now if you entered test example com  the value of  subdomain would be test   This is better than using explode because if the subdomain has a   in it  this will not cut it off

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this is my solution  it works with the most common domains  you can fit the array of extensions as you need    SubDomain   explode      explode   ext    str replace array   com     net     org      ext     SERVER  HTTP HOST     0

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For www abc en example com   host Array   explode       SERVER  HTTP HOST        Get HOST as array www  abc  en  example  com array pop  host Array   array pop  host Array        Remove com and exmaple array shift  host Array                              Remove www  Optional  echo implode  host Array                             Combine array abc en

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http   php net parse url   lt  php    url    http   user password sub hostname tld path argument value anchor      array parse url  url      array  host   explode       array  host        echo  array  host   0      returns  en    gt

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Uses the parse url function    url    http   en example com     parsedUrl   parse url  url     host   explode       parsedUrl  host       subdomain    host 0   echo  subdomain    For multiple subdomains   url    http   usa en example com     parsedUrl   parse url  url     host   explode       parsedUrl  host       subdomains   array slice  host  0  count  host  - 2    print r  subdomains

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If you only want what comes before the first period   list  sub    explode       en example com   2

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I m doing something like this   url   https   en example com   splitedBySlash   explode       url    splitedByDot   explode       splitedBySlash 2      subdomain    splitedByDot 0

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Here s a one line solution   array shift  explode        SERVER  HTTP HOST         Or using your example   array shift  explode       en example com        EDIT  Fixed  only variables should be passed by reference  by adding double parenthesis    EDIT 2  Starting from PHP 5 4 you can simply do   explode       en example com   0

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We use this function to handle multiple subdomain and multiple tld also handle ip and localhost  function analyse host   host                 my host     explode        host            my result     subdomain    gt  null   root    gt  null   tld    gt  null               if host is ip  only set as root         if filter var   host  FILTER VALIDATE IP                            something like 127 0 0 5              my result  root       host                    elseif count  my host      1                           something like localhost              my result  root       host                    elseif count  my host      2                           like jibres com              my result  root      my host 0                my result  tld       my host 1                     elseif count  my host   gt   3                           some conditons like                ermile ac ir                ermile jibres com                ermile jibres ac ir                a ermile jibres ac ir                 get last one as tld              my result  tld      end  my host               array pop  my host                   check last one after remove is probably tld or not              known tld        com    org    net    gov    co    ac    id    sch    biz                 probably tld   end  my host               if in array  probably tld   known tld                                  my result  tld      probably tld        my result  tld                    array pop  my host                               my result  root     end  my host               array pop  my host                   all remain is subdomain             if count  my host   gt  0                                 my result  subdomain     implode       my host                                    return  my result

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For those who get  Error  Strict Standards  Only variables should be passed by reference   Use like this    env    explode       SERVER  HTTP HOST       env   array shift  env

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if you are using drupal 7   this will help you   global  base path  global  base root     fulldomain   parse url  base root        splitdomain   explode       fulldomain  host      subdomain    splitdomain 0

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There isn t really a 100  dynamic solution - I ve just been trying to figure it out as well and due to different domain extensions  DTL  this task would be really difficult without actually parsing all these extensions and checking them each time    com vs  co uk vs org uk   The most reliable option is to define a constant  or database entry etc   that stores the actual domain name and remove it from the   SERVER  SERVER NAME   using substr    defined  DOMAIN          define  DOMAIN    mymaindomain co uk       function getSubDomain          if  empty   SERVER  SERVER NAME                return null               subDomain   substr   SERVER  SERVER NAME    0  - strlen DOMAIN          if  empty  subDomain              return null              return rtrim  subDomain             Now if you re using this function under http   test mymaindomain co uk it will give you test or if you have multiple sub-domain levels http   another test mymaindomain co uk you ll get another test - unless of course you update the DOMAIN   I hope this helps

[php] PHP function to get the subdomain of a URL

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