How do I solve 'Undefined index' error when the key exists? - php

Question

"foreach" loop results in an 'Undefined Index' error when I manipulate an array.
The array is generated from MS Excel and works fine with PHP array functions. When I use "foreach" loop to extract data, I get the 'Undefined Index' error but when I dump the value of the index, I get desired results.
The code extract is as below:
foreach ($membership_data as $data){
//dd($data["Gender"]);
if($data["Gender"]=='Male') {
$males_dates_of_birth[] = $data['DateofBirth'];
} elseif ($data["Gender"]=='Female'){
$females_dates_of_birth[] = $data['DateofBirth'];
} else {
$erroneous_gender_dates_of_birth[] = $data['DateofBirth'];
}
}
How can this be solved?
Or else, is there a better way to get three arrays containing dates of birth for various genders? The sample data array is as below.
array:100 [▼
6 => array:15 [▼
"MemberNumber" => "48490"
"Surname" => "Wuckert"
"FirstName" => "Clement"
"OtherNames" => "Dr. Monique Murazik II"
"DateofBirth" => "1968-08-4"
"DateEmployed" => "1988-08-04"
"DateJoinedScheme" => "1968-08-4"
"Gender" => "Female"
"DocumentType" => "National ID"
"DocumentNumber" => "a370523307a"
"KRAPIN" => "a459831176c"
"NSSFNumber" => "a526026924k"
"TelephoneNumber" => "722136702"
"EmailAddress" => "annie99#yahoo.com"
"TelephoneNumberCountry" => "Kenya"
]
7 => array:15 [▶]
8 => array:15 [▶]
9 => array:15 [▶]
10 => array:15 [▶]
11 => array:14 [▶]

Answer 1

You need to check if the key is existing in the array or not using array_key_exists
if(array_key_exists('Gender', $data) && $data["Gender"]=='Male') {
$males_dates_of_birth[] = array_key_exists('DateofBirth', $data) ? $data['DateofBirth'] : '';
} elseif (array_key_exists('Gender', $data) && $data["Gender"]=='Female'){
$females_dates_of_birth[] = array_key_exists('DateofBirth', $data) ? $data['DateofBirth'] : '';
} else {
$erroneous_gender_dates_of_birth[] = array_key_exists('DateofBirth', $data) ? $data['DateofBirth'] : '';
}