Unshift the array on condition - php

Question

I have written below lines of code
public function shiftarray($cursor, $arg)
{
$keyarguments = array("first_name","roll_no");
$arrayStudents =array();
foreach ($cursor as $k => $row)
{
foreach ($keyarguments as $key)
{
if (strcasecmp($row[$key], $arg) == 0)
{
array_unshift($arrayStudents, $row);
}
else
{
}
}
}
return $arrayStudents;
}
I have array of students in $cursor like
{ [0]=> array(50) { ["_id"]=> object(MongoId)#23 (1) { ["$id"]=> string(24) "58131c7799fbad4c1d000202" } ["student_id"]=> float(2) ["registration_temp_perm_no"]=> string(1) "1" ["roll_no"]=> float(1) ["admission_date"]=> string(10) "01/07/2016" ["first_name"]=> string(7) "Neil" ["middle_name"]=> string(4) "David" ["last_name"]=> string(6) "Stephan" ["dob"]=> string(10) "12/03/1981" ["gender"]=> string(6) "Female" ["blood_group"]=> string(2) "A+" ["birth_place"]=> string(11) "Sadar Bazar" ["nationality"]=> string(6) "Indian" ["language"]=> string(7) "English" ["religion"]=> string(8) "Agnostic" ["address_line1"]=> string(20) "4148 Hazelcrest Hill" ["address_line2"]=> string(20) "22883 Memorial Place" ["city"]=> string(11) "Sadar Bazar" ["state"]=> string(13) "Uttar Pradesh" ["pincode"]=> string(6) "190010" ["country"]=> string(5) "India" ["phone1"]=> string(10) "9039180419" ["phone2"]=> string(10) "7681559402" ["email"]=> string(24) "educianstudent#gmail.com" ["is_sms_enabled"]=> string(3) "Yes" ["is_active"]=> int(1) ["has_finished"]=> int(0) ["student_category"]=> string(1) "5" ["course"]=> string(24) "58131c7099fbad4c1d0001c2" ["Biometric_ID"]=> string(1) "1" ["siblings"]=> string(14) "Cynthia Taylor" ["guardian_name"]=> string(14) "Cynthia Taylor" ["guardian_occupation"]=> string(13) "Senior Editor" ["guardian_qualification"]=> string(20) "Research Assistant I" ["guardian_email_id"]=> string(23) "educianparent#gmail.com" ["gaurdain_contact_details"]=> string(10) "9419513603" ["guardian_relationship"]=> string(6) "Father" ["height"]=> string(3) "4.9" ["weight"]=> string(4) "34.9" ["allergies"]=> string(0) "" ["batch"]=> int(2) ["academicyear"]=> string(4) "2015" ["batchhistory"]=> array(1) { [0]=> array(5) { ["batchid"]=> float(2) ["academic_year"]=> string(4) "2015" ["course"]=> string(24) "58131c7099fbad4c1d0001c2" ["sequenceno"]=> int(1) ["courseId"]=> object(MongoId)#24 (1) { ["$id"]=> string(24) "58131c7099fbad4c1d0001c2" } } } ["uploads"]=> array(1) { ["profile_pic"]=> string(39) "58131c7799fbad4c1d000202schoolgirl2.jpg" } ["created_at"]=> NULL ["updated_at"]=> string(0) "" ["routearray"]=> array(2) { [0]=> array(5) { ["routeid"]=> int(2) ["academicyear"]=> string(4) "2016" ["current"]=> int(0) ["vehicleno"]=> string(9) "JK01S8764" ["dateofassignment"]=> string(10) "09/28/2016" } [1]=> array(5) { ["routeid"]=> int(3) ["academicyear"]=> string(4) "2016" ["current"]=> int(1) ["vehicleno"]=> string(9) "JK01S8764" ["dateofassignment"]=> string(10) "11/17/2016" } } ["HostelAlloted"]=> array(7) { ["Food Preferences"]=> string(4) "Both" ["Hostel"]=> object(MongoId)#25 (1) { ["$id"]=> string(24) "58138aee99fbade41e000031" } ["Floor"]=> string(7) "Floor_1" ["RoomNumber"]=> int(11) ["Approved"]=> string(3) "yes" ["Approved On"]=> object(MongoDate)#26 (2) { ["sec"]=> int(1472322600) ["usec"]=> int(0) } ["Academic Year"]=> string(4) "2016" } ["HostelAllotmentHistory"]=> array(1) { [0]=> array(7) { ["Food Preferences"]=> string(4) "Both" ["Hostel"]=> object(MongoId)#27 (1) { ["$id"]=> string(24) "58138aee99fbade41e000031" } ["Floor"]=> string(7) "Floor_1" ["RoomNumber"]=> int(11) ["Approved"]=> string(3) "yes" ["Approved On"]=> object(MongoDate)#28 (2) { ["sec"]=> int(1472322600) ["usec"]=> int(0) } ["Academic Year"]=> string(4) "2016" } } ["courseId"]=> object(MongoId)#29 (1) { ["$id"]=> string(24) "58131c7099fbad4c1d0001c2" } }
...
...
I am trying to bring those student on the beginning of array whose first name is brian and rest of students should at the bottom.
Now the above code place the students on the top of the array but the rest of the students are ommited/removed. I don't want them to be removed.
I am trying to tweak what code to write in else condition.
Please help!!!

Answer 1

Fill $arrayStudents before the loop otherwise only matches will be collected and unshifted.
Extend example of php.net/unshift
$add = array('big');
$queue = array(
array("orange"),
array("banana"),
array("apple1"),
array("raspberry")
);
array_unshift($queue, $add);
print_r($queue);
In your case: search for keys you want to unshift, the rest goes to the standard $list = array(/list of studends/):
$list = array();
$bringToTop = array('brian', 'elvis');
foreach($data as $item) {
if (/* in in the list to bring on top*/) {
$memory[] = $item;
} else {
$list[] = $item;
}
}
foreach($memory as $item) {
array_unshift($list, $item);
}
print_r($list);
Kind regards

Answer 2

Add $arrayStudents[] = $row; to your else scope. Here is a simple demo to illustrate it.
When matches add the element to the result from the start of array, unmatches add them from the end of the array.