Check for empty values in associative array - php

Question

I'm having a hard time checking for empty values in my associative array. And if a value is empty/null replace it with the wording "not entered"
My $_SESSION['gift'] array:
Array
(
[0] => Array
(
[giftGiveMy] => 1a
[giftTo] => 2a
)
[1] => Array
(
[giftGiveMy] => 1b
[giftTo] => '' //### empty ###
)
)
if (empty($_SESSION['gift']) && 0 !== $_SESSION['gift']) {
$gifts = "No specific gifts identified.\n";
} else {
$gifts = [];
foreach( $_SESSION['gift'] as $value) {
$gifts[] = "I give my ". $value['giftGiveMy'] ." to ". $value['giftTo'] .".\n";
}
$gifts = join($gifts);
}
The above outputs:
I give my 1a to 2a.
I give my 1b to .
I would like it read:
I give my 1a to 2a.
I give my 1b to not entered.

Answer 1

You can replace all empty and NULL value with not entered with the help of array_walk_recursive and use you code as it is
array_walk_recursive($arrayMain, 'not_entered');
function not_entered(& $item, $key) {
if (($item === "") || ($item ==NULL)){
$item = "not entered";
}
}
var_dump($arrayMain);

Answer 2

Just use foreach to loop all values and check if it's empty
$emptyText = '<b>not entered</b>';
// `empty` will also be true if element does not exist
if (empty($_SESSION['gift'])) {
$gifts = "No specific gifts identified.\n";
} else {
$gifts = [];
foreach($_SESSION['gift'] as $value) {
$myGive = !empty($value['giftGiveMy']) ? $value['giftGiveMy'] : $emptyText;
$giftTo = !empty($value['giftTo']) ? $value['giftTo'] : $emptyText;
$gifts[] = "I give my {$myGive} to {$giftTo}.";
}
$gifts = implode("\r\n", $gifts); // Or `<br/>` if outputted to HTML
}

Answer 3

You should modify your code and write it this way:
if (!isset($_SESSION['gift']) || empty($_SESSION['gift'])) {
$gifts = "No specific gifts identified.\n";
} else {
foreach( $_SESSION['gift'] as $value) {
$gift_to = !empty($value['giftTo']) ? $value['giftTo'] : '<strong>Not entered<strong>';
$gifts[] = "I give my ". $value['giftGiveMy'] ." to ". $gift_to .".\n";
}
}

Answer 4

You might want to try this:
if (empty($_SESSION['gift']) && 0 !== $_SESSION['gift']) {
$gifts = "No specific gifts identified.\n";
} else {
$gifts = [];
foreach( $_SESSION['gift'] as $value) {
$gifts[] = "I give my ". $value['giftGiveMy'] ." to ". (!empty($value['giftTo']) ? $value['giftTo'] : '<b>not entered</b>') .".\n";
}
$gifts = join($gifts);
}
If you would like to make it a little cleaner you could extract the ternary operator into something like this;
$giftTo = !empty($value['giftTo']) ? $value['giftTo'] : '<b>not entered</b>';
$gifts[] = "I give my ". $value['giftGiveMy'] ." to ". $giftTo .".\n";

Answer 5

Try:
$arr = $_SESSION['gift'];
foreach($arr as $key => $array) {
if($array['giftGiveMy'] == null || empty($array['giftGiveMy'])) {
$arr[$key]['giftGiveMy'] = 'not entered.';
}
if($array['giftTo'] == null || empty($array['giftTo'])) {
$arr[$key]['giftTo'] = 'not entered.';
}
}

Answer 6

I'd write that this way:
$gifts = "No specific gifts identified.\n";
$filter = function($str) {
return empty($str) ? 'not entered' : $str;
};
if(!empty($_SESSION['gift'])) {
$gifts = '';
array_walk($_SESSION['gift'], function($given) use(&$gifts,$filter){
$gifts .= 'I give my ' . $filter($given['giftGiveMy']) . ' to ' . $filter($given['giftTo']) . ".\n";
});
}

Answer 7

You can use for the below code also there is no need any extra Php functions.
$arr = array(
0 => array(
'giftGiveMy' => '1a',
'giftTo' => '2a'
),
1 => array(
'giftGiveMy' => '1b',
'giftTo' => ''
)
);
$str = '';
if (!empty($arr)) {
foreach ($arr as $key => $value) {
if ($value['giftGiveMy'] == '')
$value['giftGiveMy'] = 'not entered';
if ($value['giftTo'] == '')
$value['giftTo'] = '<strong>not entered</strong>';
//$new[$key] = $value;
$str .= "I give my " . $value['giftGiveMy'] . " to " . $value['giftTo'] . "<br />";
}
}else {
$str = 'No specific gifts identified.<br />';
}
echo $str;

Answer 8

This validates an associative array with empty() (see array_filter), but may not respond to the original question.
<?php
$var = array();
$var['position'] = 'executive';
$var['email'] = 'a#email.com';
$var['message'] = 'This is the message';
$var['name'] = 'John Doe';
$var['telephone'] = '123456789';
$var['notneededparam'] = 'Nothing';
$expectedParams = ['position', 'email', 'message', 'name', 'telephone'];
$params = array_intersect_key($var, array_flip($expectedParams));
// check existence of keys and that they are valid
if(count($params) != count($expectedParams) || count(array_filter($params)) != count($expectedParams)){
echo "not valid\n";
die();
}
extract($params);
var_dump($name);
Other functions used here: array_flip(), array_intersect_key(), count(), extract(), var_dump(),