Manipulate a url string by adding GET parameters

Question

I want to add GET parameters to URLs that may and may not contain GET parameters without repeating   or  amp    Example   If I want to add category action   url  http   www acme com       will add  category action at the end   url  http   www acme com movies sort popular       will add  amp category action at the end   If you notice I m trying to not repeat the question mark if it s found   The URL is just a string   What is a reliable way to append a specific GET parameter

User · Answer

Here s a shorter version of the accepted answer    url     parse url  url  PHP URL QUERY      amp             category action     Edit  as discussed in the accepted answer  this is flawed in that it doesn t check to see if category already exists  A better solution would be to treat the   GET for what it is - an array - and use functions like in array

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parameters   array     foreach   get as  key   gt   value          parameters      key      value      url    http   example com movies   implode   amp     parameters

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Use strpos to detect a    Since   can only appear in the URL at the beginning of a query string  you know if its there get params already exist and you need to add params using  amp   function addGetParamToUrl  amp  url   varName   value           is there already an       if  strpos  url                       url      amp      varName          value             else                url           varName          value

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another improved function version  Mix of existing answers with small improvements  port support  and bugfixes  checking keys properly            param string  url original url to modify - can be relative  partial etc     param array  paramsOverride associative array  can be empty     return string modified url     protected function overrideUrlQueryParams  url   paramsOverride       if   is array  paramsOverride            return  url              url parts   parse url  url        if  isset  url parts  query               parse str  url parts  query     params         else            params                   params   array merge  params   paramsOverride         res            if isset  url parts  scheme                res     url parts  scheme                     if isset  url parts  host                res            url parts  host               if isset  url parts  port                res           url parts  port               if  isset  url parts  path                res     url parts  path               if  count  params   gt  0             res          http build query  params              return  res

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Basic method   query   parse url  url  PHP URL QUERY       Returns a string if the URL has parameters or NULL if not if   query         url      amp category 1     else        url      category 1       More advanced   url    http   example com search keyword test amp category 1 amp tags   fun amp tags   great     url parts   parse url  url      If URL doesn t have a query string  if  isset  url parts  query          Avoid  Undefined index  query      parse str  url parts  query     params     else        params   array        params  category     2         Overwrite if exists  params  tags        cool       Allows multiple values     Note that this will url encode all values  url parts  query     http build query  params       If you have pecl http echo http build url  url parts       If not echo  url parts  scheme              url parts  host      url parts  path            url parts  query      You should put this in a function at least  if not a class

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lt  php  url1     test a 4 amp b 3    url2    www baidu com test a 4 amp b 3 amp try count 1    url3    http   www baidu com test a 4 amp b 3 amp try count 2    url4     test   function add or update params  url  key  value        a   parse url  url        query    a  query      a  query             parse str  query  params        params  key     value       query   http build query  params        result           if  a  scheme              result     a  scheme                    if  a  host              result            a  host              if  a  path              result      a  path              if  query            result            query            return  result    echo add or update params  url1  try count  1   echo   n   echo add or update params  url2  try count  2   echo   n   echo add or update params  url3  try count  3   echo   n   echo add or update params  url4  try count  4   echo   n

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This function overwrites an existing argument  function addToURL   key   value   url         info   parse url   url        parse str   info  query     query        return  info  scheme              info  host      info  path           http build query   query   array merge   query  array  key   gt   value       array   key   gt   value

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I think you should do it something like this   class myURL       protected  baseURL   requestParameters       public function   construct   newURL             this- gt baseurl    newURL           this- gt requestParameters   array               public function addParameter   parameter             this- gt requestParameters      parameter             public function   toString              return  this- gt baseurl                   count  this- gt requestParameters                         implode   amp     this- gt requestParameters                                                      url1   new myURL   http   www acme com     url2   new myURL   http   www acme com     url2- gt addParameter  sort popular     url2- gt addParameter  category action     url1- gt addParameter  category action     echo  url1   n   url2

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Example with updating existent parameters   Also url encode used  and possibility to don t specify parameter value        lt                  Add parameter to URL         param string  url         param string  key         param string  value         return string result URL             function addToUrl  url   key   value   null             query   parse url  url  PHP URL QUERY           if   query                parse str  query   queryParams                queryParams  key     value               url   str replace    query         http build query  queryParams    url             else                url          urlencode  key          urlencode  value                     return  url

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example addParamToUrl   path to  find 1   array  find    gt  array  search   2    FILTER    gt   STATUS        example addParamToUrl    example com path to  find 1   array  find    gt  array  search   2    FILTER    gt   STATUS        example addParamToUrl  https   example com path to  find 1 amp FILTER Y   array  find    gt  array  search   2    FILTER    gt   STATUS           param        url string url     param array  addParams        return string     function addParamToUrl  url  array  addParams      if   is array  addParams         return  url          info   parse url  url       query   array       if   info  query          parse str  info  query     query          if   is array  query          query   array            params   array merge  query   addParams       result          if   info  scheme           result     info  scheme                 if   info  host           result            info  host           if   info  path           result     info  path           if   params         result          http build query  params          return  result

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data   array  foo   gt  bar                  baz   gt  boom                  cow   gt  milk                  php   gt  hypertext processor      queryString    http build query  data      queryString   foo bar amp baz boom amp cow milk amp php hypertext processor  echo  http   domain com    queryString    output  http   domain com foo bar amp baz boom amp cow milk amp php hypertext processor

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public function addGetParamToUrl  url   params        foreach   params as  param             if  strpos  url                               url      amp    http build query  param                      else                        url         http build query  param                        return  url

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Try this function to add URL parameters   Then you can disable the link when parameter is set so there is no url parameter duplicate    lt  php   function addQueryString  a                                 if  empty   SERVER  QUERY STRING                    return        a               else if   empty   SERVER  QUERY STRING                   return         SERVER  QUERY STRING       amp      a                      gt     lt a href   lt  php echo addQueryString  lang en      gt   gt test lt  a gt    lt a href   lt  php echo addQueryString  category 5      gt   gt sat lt  a gt

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After searching for many resources answers on this topic  I decided to code my own  Based on  TaylorOtwell s answer here  this is how I process incoming   GET request and modify manipulate each element   Assuming the url is  http   domain com category page php a b amp x y And I want only one parameter for sorting  either  desc column name or  asc column name  This way  single url parameter is enough to sort and order simultaneously  So the URL will be http   domain com category page php a b amp x y amp desc column name on first click of the associated table header row   Then I have table row headings that I want to sort DESC on my first click  and ASC on the second click of the same heading   Each first click should  ORDER BY column DESC  first  And if there is no sorting  it will sort by  date then id  by default   You may improve it further  like you may add cleaning filtering functions to each   GET component but the below structure lays the foundation   foreach    GET AS  KEY   gt   VALUE       if   KEY     desc             SORT    VALUE           ORDER    ORDER BY  VALUE DESC            URL ORDER    URL ORDER     amp asc  VALUE         elseif   KEY     asc             SORT    VALUE           ORDER    ORDER BY  VALUE ASC            URL ORDER    URL ORDER     amp desc  VALUE         else            URL ORDER      amp  KEY  VALUE            URL      amp  KEY  VALUE           if    ORDER   ORDER    ORDER BY date DESC  id DESC    if   URL ORDER   URL ORDER     SERVER SCRIPT URL          trim  URL ORDER    amp      if   URL   URL     SERVER SCRIPT URL          trim  URL    amp         You may use   SERVER SCRIPT URI  for full URL beginning with http   domain com   Then I use resulting  ORDER I get above  in the MySQL query    SELECT   FROM table WHERE limiter    any   ORDER     Now the function to look at the URL if there is a previous sorting and add sorting  and ordering  parameter to URL with     or   amp   according to the sequence           function sort order    SORT               global  SORT   URL ORDER   URL              if   SORT      SORT                   return  URL ORDER                else                   if  strpos  URL           false                       return   URL amp desc   SORT                     else                                               return   URL desc   SORT                                               Finally  the table row header to use the function           echo   lt th gt  lt a href    sort order  id      gt ID lt  a gt  lt  th gt      Summary  this will read the URL  modify each of the   GET components and make the final URL with parameters of your choice with the correct form of usage of     and   amp

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In case you are using WordPress you can simply use       add query args   sort    gt   asc     http  example com  search news     Docs https   developer wordpress org reference functions add query arg

[php] Manipulate a url string by adding GET parameters

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