PHP case-insensitive in array function

Question

Is it possible to do case-insensitive comparison when using the in array function   So with a source array like this    a  array    one     two     three     four       The following lookups would all return true   in array  one    a   in array  two    a   in array  ONE    a   in array  fOUr    a     What function or set of functions would do the same  I don t think in array itself can do this

User · Answer

Say you want to use the in array  here is how you can make the search case insensitive   Case insensitive in array     foreach  searchKey as  key   gt   subkey          if  in array strtolower  subkey   array map  strtolower    subarray                   echo  found               Normal case sensitive   foreach  searchKey as  key   gt   subkey     if  in array   subkey    subarray                   echo  found

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function in arrayi  needle   haystack        return in array strtolower  needle   array map  strtolower    haystack        Source  php net in array manual page

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a    1   gt   funny   3   gt   meshgaat   15   gt   obi   2   gt   OMER        b    omer    function checkArr  x  array         arr   array values  array        arrlength   count  arr        z   strtolower  x        for   i   0   i  lt   arrlength   i              if   z    strtolower  arr  i                  echo  yes                          checkArr  b   a

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The above is correct if we assume that arrays can contain only strings  but arrays can contain other arrays as well  Also in array   function can accept an array for  needle  so strtolower  needle  is not going to work if  needle is an array and array map  strtolower    haystack  is not going to work if  haystack contains other arrays  but will result in  PHP warning  strtolower   expects parameter 1 to be string  array given    Example    needle   array  p    H     haystack   array array  p    H     U      So i created a helper class with the releveant methods  to make case-sensitive and case-insensitive in array   checks  I am also using mb strtolower   instead of strtolower    so other encodings can be used  Here s the code   class StringHelper    public static function toLower  string   encoding    UTF-8         return mb strtolower  string   encoding             Digs into all levels of an array and converts all string values to lowercase     public static function arrayToLower  array        foreach   array as  amp  value            switch  true                case is string  value                    value   self  toLower  value                   break              case is array  value                    value   self  arrayToLower  value                   break                      return  array            Works like the built-in PHP in array   function     Checks if a value exists in an array  but    gives the option to choose how the comparison is done - case-sensitive or case-insensitive     public static function inArray  needle   haystack   case    case-sensitive    strict   false        switch   case            default          case  case-sensitive           case  cs               return in array  needle   haystack   strict               break          case  case-insensitive           case  ci               if  is array  needle                     return in array self  arrayToLower  needle   self  arrayToLower  haystack    strict                 else                   return in array self  toLower  needle   self  arrayToLower  haystack    strict                             break

User · Answer

I wrote a simple function to check for a insensitive value in an array the code is below   function   function in array insensitive  needle   haystack        needle   strtolower  needle      foreach  haystack as  k   gt   v           haystack  k    strtolower  v           return in array  needle   haystack       how to use    array   array  one    two    three    four    var dump in array insensitive  fOUr    array

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in array accepts these parameters   in array search array type   if the search parameter is a string and the type parameter is set to TRUE  the search is case-sensitive  so in order to make the search ignore the case  it would be enough to use it like this      a   array   one    two    three    four       b   in array   ONE    a  false

User · Answer

you can use preg grep      a  array    one     two     three     four      print r  preg grep    ONe i     a

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The obvious thing to do is just convert the search term to lowercase   if  in array strtolower  word    array              of course if there are uppercase letters in the array you ll need to do this first    search array   array map  strtolower    array     and search that  There s no point in doing strtolower on the whole array with every search   Searching arrays however is linear  If you have a large array or you re going to do this a lot  it would be better to put the search terms in key of the array as this will be much faster access    search array   array combine array map  strtolower    a    a     then  if   search array strtolower  word               The only issue here is that array keys must be unique so if you have a collision  eg  One  and  one   you will lose all but one

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function in arrayi  needle   haystack        return in array strtolower  needle   array map  strtolower    haystack        From Documentation

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user agent    yandeX    bots     Google   Yahoo   Yandex                     foreach  bots as  b        if  stripos   user agent   b       false   return  b

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in array function variant that performs case-insensitive comparison when needle is a string         param mixed  needle     param array  haystack     param bool  strict        return bool     function in arrayi  needle  array  haystack  bool  strict   false   bool        if  is string  needle               needle   strtolower  needle            foreach   haystack as  value                 if  is string  value                     if  strtolower  value       needle                        return true                                                      return false              return in array  needle   haystack   strict               in array function variant that performs case-insensitive comparison when needle is a string     Multibyte version         param mixed  needle     param array  haystack     param bool  strict     param string null  encoding        return bool     function mb in arrayi  needle  array  haystack  bool  strict   false   string  encoding   null   bool        if  null      encoding             encoding   mb internal encoding               if  is string  needle               needle   mb strtolower  needle   encoding            foreach   haystack as  value                 if  is string  value                     if  mb strtolower  value   encoding       needle                        return true                                                      return false              return in array  needle   haystack   strict

[php] PHP case-insensitive in_array function

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