How do you remove an array element in a foreach loop

Question

I want to loop through an array with foreach to check if a value exists  If the value does exist  I want to delete the element which contains it   I have the following code   foreach  display related tags as  tag name        if  tag name     found tag  name                 Delete element           I don t know how to delete the element once the value is found  How do I delete it   I have to use foreach for this problem  There are probably alternatives to foreach  and you are welcome to share them

User · Answer

foreach  display related tags as  key   gt   tag name        if  tag name     found tag  name            unset  display related tags  key

User · Answer

As has already been mentioned  you   d want to do a foreach with the key  and unset using the key     but note that mutating an array during iteration is in general a bad idea  though I   m not sure on PHP   s rules on this offhand

User · Answer

if you have scenario in which you have to remove more then one values from the foreach array in this case you have to pass value by reference in for each  I try to explain this scenario   foreach   manSkuQty as  man sku   gt   amp  man qty                    foreach   manufacturerSkus as  key1   gt   val1          some processing here and unset first loops entries                           here dont include again for next iterations                            if some condition                              unset  manSkuQty  key1                                                    in second loop you want to unset first loops entries dont come again in the iteration for performance purpose or else then unset from memory as well because in memory they present and will come in iterations

User · Answer

If you also get the key  you can delete that item like this   foreach   display related tags as  key   gt   tag name        if  tag name     found tag  name              unset  display related tags  key

User · Answer

A better solution is to use the array filter function   display related tags       array filter  display related tags  function  e  use  found tag           return  e     found tag  name             As the php documentation reads   As foreach relies on the internal array pointer in PHP 5  changing it within the loop may lead to unexpected behavior  In PHP 7  foreach does not use the internal array pointer

User · Answer

Instead of doing foreach   loop on the array  it would be faster to use array search   to find the proper key  On small arrays  I would go with foreach for better readibility  but for bigger arrays  or often executed code  this should be a bit more optimal    result array search  unwantedValue  array true   if  result     false      unset  array  result           The strict comparsion operator     is needed  because array search   can return 0 as the index of the  unwantedValue   Also  the above example will remove just the first value  unwantedValue  if the  unwantedValue can occur more then once in the  array  You should use array keys    to find all of them    result array keys  array  unwantedValue true  foreach  result as  key      unset  array  key        Check http   php net manual en function array-search php for more information

User · Answer

There are already answers which are giving light on how to unset  Rather than repeating code in all your classes make function like below and use it in code whenever required  In business logic  sometimes you don t want to expose some properties  Please see below one liner call to remove  public static function removeKeysFromAssociativeArray  associativeArray   keysToUnset        if  empty  associativeArray     empty  keysToUnset           return array         foreach   associativeArray as  key   gt   arr            if   is array  arr                 continue                     foreach   keysToUnset as  keyToUnset                if  array key exists  keyToUnset   arr                     unset  arr  keyToUnset                                     associativeArray  key     arr            return  associativeArray      Call like   removeKeysFromAssociativeArray  arrValues   keysToRemove

[php] How do you remove an array element in a foreach loop?

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