Difference between array_merge and array_combine in PHP

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array_merge merges two or more arrays into one, while array_combine creates an array by using one array for keys and another for its values.

array_merge can merge arrays with duplicate keys, while array_combine requires unique keys in the first array
array_merge preserves numeric keys, while array_combine reindexes the keys starting from 0
array_merge can merge more than two arrays, while array_combine requires exactly two arrays
Example of array_merge: array_merge([1,2],[3,4],[5,6]) returns [1,2,3,4,5,6]
Example of array_combine: array_combine(['a','b','c'],[1,2,3]) returns ['a'=>1,'b'=>2,'c'=>3]

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