I have a table that I am reading two columns from using PDO::FETCH_KEY_PAIR. I then need check if a value from another query exists in the array returned by the PDO fetch. To illustrate:
$id = array();
/* array returned by PDO::FETCH_KEY_PAIR query */
$mailTo = array (
'MailTo1' => 6143,
'MailTo2' => 6137,
'MailTo3' => 6137,
);
echo $mailTo['MailTo1']; //6143
$result1['needle'] = 'MailTo1'; //needle from second query to seek
if(in_array($result1['needle'], $mailTo)){
$id['mailTo'] = $mailTo[$result1['needle']]; //null
}
using variable $result['needle'] returns null, but to verify that in_array returns the correct element I have used:
if(in_array('MailTo1', $mailTo)){
$id['mailTo'] = $mailTo[$result['needle']]; //6143
}
Hard coding the needle returns the correct element. Taking the needle out an array and passing as a simple variable also returns null, i.e.
$result = 'MailTo1';
if(in_array($result1, $mailTo)){
$id['mailTo'] = $mailTo[$result1]; //null
}
I cannot figure out why passing the needle as a key=>value variable ($result1['needle']) fails. It seems like this is very common practice...
In order to compare keys you need to use array key exists. in_array only looks at values and not the keys.
array_key_exists("MailTo1",$mailTo)
Another approach would be to get all keys in one array and then you can use in_array()
$mailToKeys = array_keys($mailTo);
in_array("MailTo1", $MailToKeys)
DOH!!! Wrong approach.. array_key_exists is what I should have been using!!
I would like to search value of order using array_search function i have tried following ways but it does not work.
printed array display output
PostDaataArray
(
[order_id] => 5464
)
$currentKey=array_search($orderId,$postedData);
also tried $currentKey=array_search($orderId,array_column($postedData, 'order_id'));
But when i tried to search array using array_search function it does not work also not showing error as well.
If previously data in JSON format then decode it:
$postedData = json_decode($postedData,true);
You can use in_array():
if(in_array($orderId,array_column($postedData, 'order_id'))) //check value is in array
{
$key = array_search($orderId,array_column($postedData, 'order_id')); //return index or key of array
}
else
{
//order id not in array
}
try this:
$PostDaataArray=array("order_id"=>"5464");
foreach($PostDaataArray as $key=>$order_id){
if($order_id=="5464"){
// match found.
}
}
I created 2 arrays and want to check for the difference between both arrays (values). If I use my arrays with the function array_diff, the response is a empty Array, which is very wierd as I can't find the problem at all.
My setup:
// first array
$listing_products_sku = [
'55995', '55996', '55999', '56000', '56005', '56006', '56007',
'56008', '56021', '56022', '56023', '56024', '56029', '56030',
'56031', '56032', '56036', '56037',
];
// second array:
$internal_products_sku = [
'56015', '56016', '56014', '56018', '56019', '56020', '55994',
'55995', '55996', '55997', '55998', '55999', '56000', '56001',
'56002', '56003', '56005', '56004', '56006', '56007', '56008',
'56009', '56010', '56011', '56012', '56013', '56017', '56021',
'56022', '56023', '56024', '56025', '56026', '56027', '56028',
'56029', '56030', '56031', '56032', '56033', '56034', '56035',
'56036', '56037', '56038', '56039', '56040', '56041', '60434',
'60435',
];
// used function:
$diff_result = array_diff($listing_products_sku, $internal_products_sku);
print_r($diff_result);
Output
Array ( )
Help needed
Is anybody able to explain why this happens and how I can make this working?
array_diff() returns array from first array containing values not exist in rest of the arrays (http://php.net/manual/en/function.array-diff.php). As your first array's element are already exist in second array ($internal_products_sku) this is why its returning empty array.
So to find the difference all you have to do is take the $internal_products_sku array as first param then check
$diff_result = array_diff($internal_products_sku, $listing_products_sku);
print_r($diff_result);
Now it will return an array with those value not exist in $listing_products_sku
When I put print_r($data); I get the following
Array
(
[name] => Cheese
)
Is there a way to get the key name in a variable on its own?
There may be occasions that name could be email and other values.
Use array_keys():
var_dump(array_keys($data));
Return all the keys or a subset of the keys of an array
Do you mean you know the value but you don't know the key? If so you could write something like this:
$array = ['name' => 'Cheese'];
array_flip($array);
var_export($array['Cheese']); // Output: name
You can have the array key extracted to their own variables using the extract function. For example
$a = array("color"=>"blue");
extract($a);
echo $color;
I want to search a value in and array and match with key if key exits returns it's value like if value 'foo' search in an array $array and if 'foo' found in an array returns its' value 1.
$array = array('foo'=>1, 'foo2'=>2, 'foo3'=>3);
I try with an array_key_exists() function but we know it return true or false value but I have need its value.
This should work for you:
(Here i just simply flip the array with array_flip() to search the value in the keys with in_array())
<?php
$array = array('foo'=>1, 'foo2'=>2, 'foo3'=>3);
if(in_array("foo", array_flip($array)))
echo $array["foo"];
?>