phpexcel-styling-api.php

<?php
$excel = new \PHPExcel();
$sheet = $excel->getActiveSheet();

$style = new \PHPExcel_Style();
$style
    ->getFill()
    ->setFillType(\PHPExcel_Style_Fill::FILL_SOLID)
    // it's a solid color, do I have to set start or end? or are both required?
    ->setStartColor(new \PHPExcel_Style_Color(\PHPExcel_Style_Color::COLOR_RED))
    ->setEndColor(new \PHPExcel_Style_Color(\PHPExcel_Style_Color::COLOR_RED))
;

$cell = $sheet->getCell('A1');
// can't style a cell?
//$cell->setStyle(...)
// but I have to... duplicate the styling?
$sheet->duplicateStyle($style, 'A1');