Web Reference: The reason for the above output is that EVERY array in PHP is an associative one. Since the 3 elements in $b have the same keys( or numeric indices ) as those in $a, those elements in $b are ignored by the union operator. The + operator returns the right-hand array appended to the left-hand array; for keys that exist in both arrays, the elements from the left-hand array will be used, and the matching elements from the right-hand array will be ignored. In PHP, array operators are used to compare and combine arrays. These operators are useful for a variety of tasks, like merging two arrays, testing if two arrays are equal and finding whether they have the same order and data types.
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Php Array Operators Union Equality Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $13M - $30M
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Last Updated: April 7, 2026
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