array_unique() takes input array and returns a new array
without duplicate values.
Note that keys are preserved.
array_unique() sorts the values treated as string at
first, then will keep the first key encountered for every
value, and ignore all following keys. It does not mean that
the key of the first related value from the unsorted array will be kept.
注: Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same.
The first element will be used.
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