(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SplFixedArray::offsetSet — Sets a new value at a specified index
public SplFixedArray::offsetSet(int $index, mixed $value): void
Sets the value at the specified index to value.
indexThe index being set.
value The new value for the index.
No value is returned.
Throws RuntimeException when index is outside the defined size of the array or when index cannot be parsed as an integer.
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https://www.php.net/manual/en/splfixedarray.offsetset.php