The array element with the key "o" from readRowsWithStyles() returns the original value stored in the cell, without any conversion.

But in Excel, the numbers are displayed in "float" format. For example, the number 12345678909 is displayed as is, but the number 123456789098 is displayed as 1.234567E+11

readRowsWithStyles contain too many other keys
i need only key "o"

readRowsWithStyles contain too many other keys i need only key "o"

$rows = array_map(fn($row) => $row['o'], $rows);

If you're concerned about performance impact, I doubt it will matter that much but ¯\(ツ)/¯