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PHP array_merge Function

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Description and Usage: Merges one or more arrays
Overwrites string keys in merged arrays
Appends numeric keys without overwriting
Renumbers numeric keys starting from zero
Parameters and Return: Requires variable list of arrays to merge
Returns merged array or empty array without arguments
Alternatives: + operator preserves numeric keys
array_merge_recursive() merges arrays recursively
array_replace() replaces elements from arrays
array_combine() creates array from key-value pairs
Performance Notes: Spread operator is slower than array_merge in PHP 7.4 and 8.0
Numeric keys in strings are also renumbered
String keys with integers are converted to integers