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Re: Help with searching arrays of objects

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On Thu, 18 Apr 2013 08:35:27 -0700, daveh wrote:

> On Thursday, April 18, 2013 9:24:50 AM UTC-4, Jerry Stuckle wrote:
>> On 4/17/2013 8:47 PM, daveh@allheller.net wrote:

>> > Hello,

>> > I know this has probably been asked before but I'm still a bit of a
>> > noob.
>> 
>> > Given  the following structure I need a way to get a "key" to the
>> > desired object using a members value.

Simplifying your array

>> > Array
>> > (
>> >      [0] => gnp Object
>> >          (
>> >              [m_name] => db_1
>> >          )
>> >      [1] => gnp Object
>> >          (
>> >              [m_name] => db_2
>> >          )
>> > )

>> > So I need a method to find the objects key using m_name's value.

>> About the only thing you can do is use a foreach() loop to step through
>> 
>> the array items, comparing m_name in each object to the desired value,
>> i.e.
>> 
>> for ($mylist as $key => $item) {
>>    if ($item->m_name = $desired_value) {
>>      // $key will contain the index of the desired item here

>> Additionally, if these are class objects, you should study up on object
>> oriented techniques; your data should be private and you should have
>> access methods to get and set the values.  This ensures validity of the
>> objects at all times.

> Yeah I know its still a work in progress.

Assuming you have access to the code that defines a gnp class, add a 
method such as:

public function get_name() {
return $this->m_name;
}

Then, building on Jerry's foreach, if you just want to get the index 
value ($key) or the class member ($item) for the first (only, if you're 
sure there's only ever one) match:

foreach ($mylist as $key => $item)
   if ($item->get_name() == $desired_value)
      break;

// $key will contain the index of the desired item here
// and $item will contain the actual item

however if you want to process every matching element of the array in 
some way:

foreach ($mylist as $key => $item)
   if ($item->get_name() == $desired_value) {
      // do something here with the $key or $item
   }

-- 
Denis McMahon, denismfmcmahon@gmail.com

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Help with searching arrays of objects daveh@allheller.net - 2013-04-17 17:47 -0700
  Re: Help with searching arrays of objects Jerry Stuckle <jstucklex@attglobal.net> - 2013-04-18 09:24 -0400
    Re: Help with searching arrays of objects daveh@allheller.net - 2013-04-18 08:35 -0700
      Re: Help with searching arrays of objects Denis McMahon <denismfmcmahon@gmail.com> - 2013-04-18 18:10 +0000
        Re: Help with searching arrays of objects The Natural Philosopher <tnp@invalid.invalid> - 2013-04-18 19:29 +0100
      Re: Help with searching arrays of objects Jerry Stuckle <jstucklex@attglobal.net> - 2013-04-18 14:20 -0400
      Re: Help with searching arrays of objects "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2013-04-19 10:18 +0200

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