How to check if an array value exists

Question

How can I check if  something  say   has the value of  bla  or  omg     something   array  say    gt   bla    say    gt   omg

User · Answer

To check if the index is defined  isset  something  say

User · Answer

bool in array   mixed  needle   array  haystack    bool  strict   FALSE       Another use of in array  in array   with an array as needle   lt  php  a   array array  p    h    array  p    r     o     if  in array array  p    h     a         echo   ph  was found n      if  in array array  f    i     a         echo   fi  was found n      if  in array  o    a         echo   o  was found n       gt

User · Answer

You can use    array search   in array   a combination of array flip   and array key exists

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You can test whether an array has a certain element at all or not with isset   or sometimes even better array key exists    the documentation explains the differences   If you can t be sure if the array has an element with the index  say  you should test that first or you might get  warning  undefined index      messages     As for the test whether the element s value is equal to a string you can use    or  again sometimes better  the identity operator     which doesn t allow type juggling     if  isset  something  say     amp  amp   bla     something  say

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Assuming you are using a simple array     i e    MyArray   array  red   blue   green      You can use this function  function val in arr  val  arr     foreach  arr as  arr val       if  arr val     val         return true              return false      Usage   val in arr  red   MyArray     returns true val in arr  brown   MyArray     returns false

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You could use the PHP in array function  if  in array   bla    yourarray           echo  has bla

User · Answer

Well  first off an associative array can only have a key defined once  so this array would never exist  Otherwise  just use in array   to determine if that specific array element is in an array of possible solutions

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lt  php if  in array  your variable    Your array          redImg    true code here     else        redImg    false code here        gt

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in array   is fine if you re only checking but if you need to check that a value exists and return the associated key  array search is a better option    data          hello        world       key   array search  world    data    if   key        echo  Key is      key    else       echo  Key not found       This will print  Key is 1

User · Answer

Using the instruction if  if isset  something  say     amp  amp   something  say        bla            do something    By the way  you are assigning a value with the key say twice  hence your array will result in an array with only one value

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Using  in array     search array   array  user from   lucky draw id   prize id     if  in array  prize id    search array         echo  The  prize id  element is in the array       Here is output   The  prize id  element is in the array    Using  array key exists     search array   array  user from   lucky draw id   prize id     if  array key exists  prize id    search array         echo  The  prize id  element is in the array       No output    In conclusion  array key exists   does not work with a simple array  Its only to find whether an array key exist or not  Use in array   instead   Here is more example    lt  php                                                      1  example with assoc array using in array       IMPORTANT NOTE  in array is case-sensitive    in array     Checks if a value exists in an array       DOES NOT WORK FOR MULTI-DIMENSIONAL ARRAY                                                       something   array  a    gt   bla    b    gt   omg    if  in array  omg    something         echo   1  The  omg  value found in the assoc array                                                              2  example with index array using in array       IMPORTANT NOTE  in array is case-sensitive    in array     Checks if a value exists in an array       DOES NOT WORK FOR MULTI-DIMENSIONAL ARRAY                                                       something   array  bla    omg    if  in array  omg    something         echo   2  The  omg  value found in the index array                                                              3  trying with array search       array search     Searches the array for a given value     and returns the corresponding key if successful       DOES NOT WORK FOR MULTI-DIMENSIONAL ARRAY                                                       something   array  a    gt   bla    b    gt   omg    if  array search  bla    something         echo   3  The  bla  value found in the assoc array                                                              4  trying with isset  fastest ever        isset     Determine if a variable is set and     is not NULL                                                       something   array  a    gt   bla    b    gt   omg    if  something  a     bla        echo   4  Yeah    bla  found in array                OUTPUT      1  The  omg  element value found in the assoc array        2  The  omg  element value found in the index array        3  The  bla  element value found in the assoc array        4  Yeah    bla  found in array          gt    Here is PHP DEMO

User · Answer

Just use the PHP function array key exists     lt  php  search array   array  first    gt  1   second    gt  4   if  array key exists  first    search array         echo  The  first  element is in the array       gt

[php] How to check if an array value exists?

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