php how to get associative array key from numeric index

Question

If I have    array   array   one    gt  value    two    gt   value2       how do I get the string one back from  array 1

User · Answer

array   array   one    gt  value    two    gt   value2      keys    array keys  array   echo  keys 0      one echo  keys 1      two

User · Answer

You might do it this way   function asoccArrayValueWithNumKey  amp  arr   key       if    count  arr   gt   key   return false     reset  array       aux     -1      found   false     while    auxKey   key  array    amp  amp    found           aux           found     aux     key           if   found  return  array  auxKey      else return false      val   asoccArrayValueWithNumKey  array  0    val   asoccArrayValueWithNumKey  array  1   etc      Haven t tryed the code  but i m pretty sure it will work   Good luck

User · Answer

Expanding on Ram Dane s answer  the key function is an alternative way to get the key of the current index of the array   You can create the following function       function get key  array   index          idx 0        while  idx   index   amp  amp  next  array    idx          if  idx   index  return key  array         else return

User · Answer

array   array   one    gt  value    two    gt   value2       allKeys   array keys  array   echo  allKeys 0     Which will output   one

User · Answer

The key function helped me and is very simple   The key   function simply returns the key of the array element that s currently being pointed to by the internal pointer  It does not move the pointer in any way  If the internal pointer points beyond the end of the elements list or the array is empty  key   returns NULL   Example   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  quot apple quot      while   fruit name   current  array             if   fruit name     apple                 echo key  array    lt br   gt                      next  array           gt   The above example will output  fruit1 lt br   gt  fruit4 lt br   gt  fruit5 lt br   gt

User · Answer

You don t  Your array doesn t have a key  1   You could    Make a new array  which contains the keys    newArray   array keys  array   echo  newArray 0     But the value  one  is at  newArray 0   not  1   A shortcut would be   echo current array keys  array     Get the first key of the array    reset  array    echo key  array    Get the key corresponding to the value  value    echo array search  value    array      This all depends on what it is exactly you want to do  The fact is   1  doesn t correspond to  one  any which way you turn it

User · Answer

Or if you need it in a loop  foreach   array as  key   gt   value        echo  key          value     n       Result     one value   two value2

User · Answer

If you only plan to work with one key in particular  you may accomplish this with a single line without having to store an array for all of the keys   echo array keys  array   i

User · Answer

If it is the first element  i e   array 0   you can try    echo key  array     If it is the second element  i e   array 1   you can try    next  array   echo key  array     I think this method is should be used when required element is the first  second or at most third element of the array  For other cases  loops should be used otherwise code readability decreases

[php] php: how to get associative array key from numeric index?

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