PHP - Get key name of array value

Question

I have an array as the following   function example            some stuff here that pushes items with         dynamically created key strings into an array         return array     now lets pretend it returns the created array          firstStringName    gt   whatEver           secondStringName    gt   somethingElse            arr   example        now I know that  arr contains  arr  firstStringName      I need to find out the index of  arr  firstStringName   so that I am able to loop through array keys  arr  and return the key string  firstStringName  by its index  How can I do that

User · Answer

If i understand correctly  can t you simply use   foreach  arr as  key  gt  value      echo  key      See PHP manual

User · Answer

Yes you can infact php is one of the few languages who provide such support    foreach  arr as  key  gt  value

User · Answer

you can use key function of php to get the key name    lt  php      array   array       fruit1    gt   apple        fruit2    gt   orange        fruit3    gt   grape        fruit4    gt   apple        fruit5    gt   apple            this cycle echoes all associative array        key where value equals  apple      while   fruit name   current  array           if   fruit name     apple             echo key  array    lt br   gt                next  array            gt    like here   PHP key - Manual

User · Answer

If the name s dynamic  then you must have something like   arr  key    which d mean that  key contains the value of the key   You can use array keys   to get ALL the keys of an array  e g    arr   array  a    gt   b    c    gt   d    x   array keys  arr     would give you   x   array 0   gt   a   1   gt   c

User · Answer

If you have a value and want to find the key  use array search   like this    arr   array   first    gt   a    second    gt   b       key   array search   a    arr      key will now contain the key for value  a   that is   first

User · Answer

key  arr     will return the key value for the current array element  http   uk php net manual en function key php

User · Answer

Here is another option   array    1  gt  one   2  gt  two   3  gt  there     array   array flip  array   echo  array  one

User · Answer

if you need to return an array elements with same value  use array keys   function   array   array  red    gt  1   blue    gt  1   green    gt  2   print r array keys  array  1

User · Answer

use array keys   to get an array of all the unique keys   Note that an array with named keys like your  arr can also be accessed with numeric indexes  like  arr 0    http   php net manual en function array-keys php

[php] PHP - Get key name of array value

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