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PHP array_combine() Function

Quick summary: The PHP array_combine() function creates an array by using one array for keys and another for values.

PHP array_combine() Syntax 

array_combine(array $keys, array $values): array
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PHP array_combine() Basic examples 

var_dump(array_combine(['a','b'], [1,2]));
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Output:
array(2) { ["a"]=> int(1) ["b"]=> int(2) }

Combines keys and values into an associative array.

PHP array_combine() Real-world usage 

$keys = ['id','name'];
$values = [1,'Alice'];
var_dump(array_combine($keys, $values));
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Output:
array(2) { ["id"]=> int(1) ["name"]=> string(5) "Alice" }

Maps column names to row values.

PHP array_combine() Edge cases 

array_combine(['a'], [1,2]);
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Output:
Warning: Both parameters should have an equal number of elements

Arrays must have the same number of elements.

PHP array_combine() Common mistakes

Mismatched array sizes

array_combine requires equal-length arrays.

Incorrect
array_combine(['a'], [1,2]);
Correct
array_combine(['a','b'], [1,2]);

Ensure both arrays have the same length.

PHP array_combine() Frequently Asked Questions

What does array_combine() do?

array_combine() creates an array using one array as keys and another as values.

Do arrays need same length?

Yes, otherwise an error occurs.

Does it modify original arrays?

No.

What happens with duplicate keys?

Later values overwrite earlier ones.

Use case?

Mapping keys to values.

Supports numeric keys?

Yes.

Supports associative arrays?

Yes.

Performance?

Fast.

Returns empty array?

If inputs are empty.

Can use mixed types?

Yes.

Common mistake?

Mismatched array lengths.

Alternative?

Loop-based mapping.

PHP array_combine() Related PHP Functions