Php Array key=> value searching - php

Question

HI I am fairly new to php.
I have an array
$arr = array(0 => array('GID'=>1,'groupname'=>"cat1",'members'=>array(0=>array('mid'=>11,'mname'=>'wwww'),1=>array('mid'=>12,'mname'=>'wswww'))),
1 => array('GID'=>2,'groupname'=>"cat2",'members'=>array(0=>array('mid'=>13,'mname'=>'gggwwww'),1=>array('mid'=>14,'mname'=>'wvvwww'))),
2 => array('GID'=>3,'groupname'=>"cat1",'members'=>array(0=>array('mid'=>15,'mname'=>'wwddsww')),1=>array('mid'=>16,'mname'=>'wwwdddw')));
ie...,I have GID,groupname,mid(member id),mname(member name).I want to insert a new mid and mname into a group if it is already in the array ,if it is not exists then create a new subarray with these elements..I also need to check a member id(mid) is also present.........................I used the code but its not working fine............. if (!empty($evntGroup)) {
foreach ($evntGroup as $k => $group) {
if ($group['GID'] == $group_id) {
foreach($group as $j=> $mem){
if($mem['mid'] == $mem_id){
unset($evntGroup[$k]['members'][$j]['mid']);
unset($evntGroup[$k]['members'][$j]['mname']);
}
else{
$evntGroup[$k]['members'][] = array(
'mid' => $mem_id,
'mname' => $mem_name);
}}
} else {
$evntGroup[] = array(
'GID' => $group_id,
'groupname' => $Group['event_group_name'],
'members' => array(
0 => array(
'mid' => $mem_id,
'mname' => $mem_name
)
)
);
}
}
} else {
$evntGroup[$i]['GID'] = $group_id;
$evntGroup[$i]['groupname'] = $Group['event_group_name'];
$evntGroup[$i]['members'][] = array(
'mid' => $mem_id,
'mname' => $mem_name);
$i++;
}

Answer 1

In the form of a function, the easiest solution will look something like this:
function isGidInArray($arr, $val) {
foreach($arr as $cur) {
if($cur['GID'] == $val)
return true;
}
return false;
}
You've updated your question to specify what you want to do if the specified GID is found, but that's just a trivial addition to the loop:
function doSomethingIfGidInArray($arr, $val) {
foreach($arr as $cur) {
if($cur['GID'] == $val) {
doSomething();
break; //Assuming you only expect one instance of the passed value - stop searching after it's found
}
}
}
There is unfortunately no native PHP array function that will retrieve the same index of every array within a parent array. I've often wanted such a thing.

Answer 2

Something like this will match if GID equals 3:
foreach( $arr as $item ) {
if( $item['GID'] == 3 ) {
// matches
}
}

Answer 3

There is the code
function updateByGid(&$array,$gid,$groupname,$mid,$mname) {
//For each element of the array
foreach ($array as $ii => $elem) {
//If GID has the same value
if ($elem['GID'] == $gid) {
//Insert new member
$array[$ii]['members'][]=array(
'mid'=>$mid,
'mname'=>$mname);
//Found!
return 0;
}
}
//If not found, create new
$array[]=array(
'GID'=>$gid,
'groupname'=>$groupname,
'members'=>array(
0=>array(
'mid'=>$mid,
'mname'=>$mname
)
)
);
return 0;
}