flipArray

flipArray

Flips an array, swapping keys and values, but uses conditional logic to handle two special cases:

1. Duplicate Values: If multiple keys share the same value, the resulting key will have an array containing all the original keys.
2. Nested Numerical Arrays: If a value is a numerically indexed array, the nested values are extracted and become new keys in the output, using the original parent key as their value. Otherwise, all other entries flip as normal.

There are examples below with a comparison to PHP's array_flip function.

Usage

flipArray(array $array): array

Parameters

array (array) : Array to flip.

Return Value

(array) : Returns the flipped array.

Examples

$fx->flipArray(['a' => 10, 1 => 'apple'])
// Result: [10 => 'a', 'apple' => 1]

Output Examples

Array [^1]	flipArray [^2]	array_flip [^3]
['a' => 10, 1 => 'apple']	[10 => 'a', 'apple' => 1]	[10 => 'a', 'apple' => 1]
['one', 'two', 'three']	['one' => 0, 'two' => 1, 'three' => 2]	['one' => 0, 'two' => 1, 'three' => 2]
['opt' => ['a' => 'one', 'b' => 'two']]	['opt' => ['one' => 'a', 'two' => 'b']]	[null]
['int' => ['one', 'two', 'three']]	['one' => 'int', 'two' => 'int', 'three' => 'int']	[null]
['one' => 'int', 'two' => 'int', 'three' => 'int']	['int' => ['one', 'two', 'three']]	['int' => 'three']
['num', 'num', 'num']	['num' => [0, 1, 2]]	['num' => 2]

[^1]: The array supplied to each function. [^2]: The output from the supplied array using the flipArray method. [^3]: The output from the supplied array using the array_flip function.

Debug Errors

• Triggers a warning if the argument is an empty array.

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