How can I update the key start from one on the php? - php

Question

My first array like this :
$photoList = array(
array(
'id' => 1,
'name' => 'chelsea.jpg'
),
array(
'id' => 2,
'name' => 'mu.jpg'
),
array(
'id' => 3,
'name' => 'city.jpg'
)
);
My second array like this :
photo = array('cover1'=>'liverpool.jpg', 'cover2'=>'city.jpg');
My code like this :
$photo = array_filter($photo, function($item) use ($photoList) {
return in_array($item, array_column($photoList, 'name')) ;
});
if (empty($photo))
$photo=null;
If I run : echo '<pre>';print_r($photo);echo '</pre>';, the result like this :
Array
(
[cover2] => city.jpg
)
I want the result like this :
Array
(
[cover1] => city.jpg
)
So if there is no cover1, the cover2 changed to be cover1
How can I do it?

Answer 1

You could re-index the keys like this :
$photoList = array(
array(
'id' => 1,
'name' => 'chelsea.jpg'
),
array(
'id' => 2,
'name' => 'mu.jpg'
),
array(
'id' => 3,
'name' => 'city.jpg'
)
);
$photo = array('cover1'=>'liverpool.jpg', 'cover2'=>'city.jpg');
$photo = array_filter($photo, function($item) use ($photoList) {
return in_array($item, array_column($photoList, 'name')) ;
});
if (empty($photo)){
$photo = null;
} else {
$idx = 1 ;
foreach ($photo as $key => $value) {
unset($photo[$key]);
$photo['cover'.$idx++] = $value;
}
}
print_r($photo);
Outputs :
Array
(
[cover1] => city.jpg
)

Answer 2

I'm not sure about what you really need. Assuming you want to do that recursively, I hope this helps:
$label = 'cover';
$index = 1;
$a_keys = array_keys($photo);
$new_photo = [];
foreach($a_keys AS $k=>$v){
$new_photo[$label.$index] = $photo[$k];
$index++;
}
$photo = $new_photo;
It will rewrite your array with wanted naming style.