Modifying multidimensional array in PHP replacing keys as the values [duplicate] - php

Question

This question already has answers here:
How to swap keys with values in array?
(6 answers)
Closed 6 years ago.
How would you modify the following code using only a foreach loop by replacing the keys as the values? For examples the salad, chicken, and pancakes keys would the values instead.
$meals = array(
'Lunch' => array(
'salad' => 'italian',
'salad2' => 'ranch',
'salad3' => 'sesame',
'salad4' => 'bluecheese'
),
'Dinner' => array(
'chicken' => 'grilled',
'chicken2' => 'baked',
'chicken3' => 'steamed',
'chicken4' => 'fried',
'chicken5' => 'broiled'
),
'Breakfast' => array(
'pancakes' => 'blueberry',
'pancakes2' => 'cherry',
'pancakes3' => 'strawberry',
'pancakes4' => 'lemon'
)
);
$newkey = array();
foreach($meals as $key => $value) {
unset($value);
// foreach ($)...
}
print_r($meals);

Answer 1

Edit
If you're unable to use array_flip(), then you'll need to do two loops: one for each meal, and one for each meal option.
Example:
foreach ($meals as $meal => $mealOptions)
{
$revisedMealOptions = array();
foreach ($mealOptions as $originalKey => $newKey)
{
$revisedMealOptions[$newKey] = $originalKey;
}
$meals[$meal] = $revisedMealOptions;
}
Original Answer
It's not entirely clear what you're after. If all you want is to turn:
'Lunch' => array(
'salad' => 'italian'
);
into
'Lunch' => array(
'italian' => 'salad'
);
use array_flip().
Example:
$meals['Lunch'] = array_flip($meals['Lunch']);
See http://php.net/manual/en/function.array-flip.php.

Answer 2

I'm sorry I am a total beginner. I need to use a nested $foreach loop to address this question. For class I'm not allowed to use the array_flip function. I have tried
$newkey = array();
foreach($meals as $key => $value) {
$newkey[] = $value;
foreach ($value as ){
}
}

Answer 3

So, it would read:
Basically I need it to read:
Array(
[Lunch] => array(
[italian] => salad,
[ranch] => salad2,
[sesame] => salad3,
[bluecheese] => salad4
)
)

Answer 4

The easiest way to do it would be like this:
$meals = array(
'Lunch' => array(
'salad' => 'italian',
'salad2' => 'ranch',
'salad3' => 'sesame',
'salad4' => 'bluecheese'
),
'Dinner' => array(
'chicken' => 'grilled',
'chicken2' => 'baked',
'chicken3' => 'steamed',
'chicken4' => 'fried',
'chicken5' => 'broiled'
),
'Breakfast' => array(
'pancakes' => 'blueberry',
'pancakes2' => 'cherry',
'pancakes3' => 'strawberry',
'pancakes4' => 'lemon'
)
);
$newArray = array();
foreach ($meals as $key => $value) {
$temp = array();
foreach ($value as $innerKey => $innerValue) {
$temp[$innerValue] = $innerKey;
}
$newArray[$key] = $temp;
}
unset($meals);
Basically, you create a new array and build it from the beginning with the use of the array $meals.