I'm working with multi-dimensional arrays in PHP. I want to store two string values in a two dimensional array. I have tried the following code:
$arr[][]=['string1']['string2'];
I have also tried:
$arr[][]="string1","string2";
Due to the comma I have a syntax error.
How can I fix this?
$arr = [];
$arr[] = ['string1'];
$arr[] = ['string2'];
// or simply
// $arr = [['string1'], ['string2']];
print_r($arr);
// output:
Array ( [0] => Array ( [0] => string1 ) [1] => Array ( [0] => string2 ) )
If you want 'string1' and 'string2' to be the key and subkey in an array then you use:
$arr = [];
$arr['string1']['string2'] = 'somevalue';
Related
I have a set of values as a string, like so:
MyCustomProductID1
MyCustomProductID2
Then I proceed to create an array out of these values with explode( "\n", $myProductIdString)
Now I have additional data (strings) that I want to combine with the value from my first array. I want that simple array into a multidimensional one:
Array
(
[0] => Array
(
[id] => MyCustomProductID1
[url] => http://example.com/MyCustomProductID1.jpg
)
[1] => Array
(
[id] => MyCustomProductID2
[url] => http://example.com/MyCustomProductID2.jpg
)
)
How do I get that first array into a multidimensional one and push data along with it?
Instead of direct assigning values to array use loop-
<?php
$str = "MyCustomProductID1
MyCustomProductID2";
$arr = explode("\n", $str);
$result = [];
$url_array = ["http://example.com/MyCustomProductID1.jpg", "http://example.com/MyCustomProductID2.jpg"];
for($i=0;$i<count($arr);$i++){
$result[$i]['id'] = $arr[$i];
$result[$i]['url'] = $url_array[$i];
}
print_r($result);
?>
I am trying to pull dynamic element in single array but result is not showing properly
Ex:
$array =array();
$element="'abc1','abc2'";
$array=array('abc',$element);
//I want result like that:
array[
[0]=>abc,
[1]=>abc1,
[2]=>ab
]
If you need to parse a string of elements to an array you can use one of the csv functions. You may then merge your arrays.
$array = array('abc');
$string_elements = "'abc1','abc2'";
$array_elements = str_getcsv($string_elements, ',', "'");
$array = array_merge($array, $array_elements);
var_export($array);
Output:
array (
0 => 'abc',
1 => 'abc1',
2 => 'abc2',
)
Alternatively to add each array element to the end of another array you can push them like so using a splat:
array_push($array, ...$array_elements);
According to my understanding, $element is storing string not an array so even if you try to get output it will display in following format
Array
(
[0] => abc
[1] => 'abc1','abc2'
)
Instead of this you can store array in $element variable and use array_merge() function to get required output e.g.
$element = array('abc1','abc2');
$array = array('abc');
$result = array_merge($array,$element);
// Output
Array
(
[0] => abc
[1] => abc1
[2] => abc2
)
I am trying to count elements in an array, but it doens't work as intended:
I have a while loop, which loops through my user table:
while($refsData=$refs->fetch()){
$new_array = array($refsData['id']);
print_r($new_array);
$outcome = $rentedrefs->_paying($new_array);
}
The print_r($new_array); gives me:
Array
(
[0] => 90427
)
Array
(
[0] => 90428
)
Array
(
[0] => 90429
)
Array
(
[0] => 90430
)
Array
(
[0] => 90431
)
Array
(
[0] => 90432
)
Array
(
[0] => 90433
)
Array
(
[0] => 90434
)
Array
(
[0] => 90435
)
Array
(
[0] => 90436
)
Inside the _paying function, I count the number of values from the array:
function _paying($referrals_array){
echo count($referrals_array);
}
The problem is, that the above count($referrals_array); just gives me: 1, when it should be 10
What am I doing wrong?
You create a new array at each step of the loop. Instead it should be written like this:
$new_array = array();
while($refsData=$refs->fetch()){
$new_array[] = $refsData['id'];
// print_r($new_array);
}
$outcome = $rentedrefs->_paying($new_array);
Note that I moved the _paying call outside the loop, as it seems to be the aggregating function. If not, you'd most probably make it process $refsData['id'] instead - not the whole array.
As a sidenote, I'd strongly recommend using fetchAll() method (instead of fetch when you need to fill a collection with results of a query. It'll be trivial to count the number of the resulting array.
It works properly, in each circulation of loop you have one array, so in first you have:
Array
(
[0] => 90427
)
in 2nd:
Array
(
[0] => 90428
)
and so on.
It should work properly:
var $count = 0;
while($refsData=$refs->fetch()){
$new_array = array($refsData['id']);
$count += count($new_array);
$outcome = $rentedrefs->_paying($new_array);
}
You are creating $new_array as a new array with the single element $refsData['id']. The count of 1 is therefore correct.
To get the number of results, either use a COUNT(*) select to ask your sql server, or add a counter to your loop, like this:
$entries = 0;
while($refsData=$refs->fetch()){
$new_array = array($refsData['id']);
print_r($new_array);
$entries++;
$outcome = $rentedrefs->_paying($new_array);
}
echo $entries;
You are not adding elements to an array, but creating a new array each iteration. To add elements, just do:
$new_array[] = $refsData['id'];
How to get the values from an array that are NOT in another array in PHP?
My current aproach have bad time complexity. Is there an inbuilt php function that can solve my problem?
Example:
$a1 = array(1,2,3,4);
$a2 = array(3,4,5,6,7);
Result:
[5,6,7];
array_diff is your friend.
Returns an array containing all the entries from array1 that are not present in any of the other arrays.
$a1 = array(1,2,3,4);
$a2 = array(3,4,5,6,7);
$result = array_diff($a2, $a1);
print_r($result);
Will output:
Array
(
[2] => 5
[3] => 6
[4] => 7
)
And if you reverse the parameters like this:
array_diff($a1, $a2)
It will output:
Array
(
[0] => 1
[1] => 2
)
I have two arrays, one is generated by using explode() on a comma separated string and the other is generated from result_array() in Codeigniter.
The results when doing print_r are:
From explode():
Array
(
[0] => keyword
[1] => test
)
From database:
Array
(
[0] => Array
(
[name] => keyword
)
[1] => Array
(
[name] => test
)
)
I need them to match up so I can use array_diff(), what's the best way to get them to match? Is there something other than result_array() in CI to get a compatible array?
You could create a new array like this:
foreach($fromDatabase as $x)
{
$arr[] = $x['name'];
}
Now, you will have two one dim arrays and you can run array_dif.
$new_array = array();
foreach ($array1 as $line) {
$new_array[] = array('name' => $line);
}
print_r($new_array);
That should work for you.