Excel to array

<?php

// Needs PHPExcel
// https://phpexcel.codeplex.com/
function excel_to_array($inputFileName,$row_callback=null){
    if (!class_exists('PHPExcel')) return false;
    try {
        $inputFileType = PHPExcel_IOFactory::identify($inputFileName);
        $objReader = PHPExcel_IOFactory::createReader($inputFileType);
        $objPHPExcel = $objReader->load($inputFileName);
    } catch(Exception $e) {
        return ('Error loading file "'.pathinfo($inputFileName,PATHINFO_BASENAME).'": '.$e->getMessage());
    }
    $sheet = $objPHPExcel->getSheet(0); 
    $highestRow = $sheet->getHighestRow(); 
    $highestColumn = $sheet->getHighestColumn();
    $keys = array();
    $results = array();
    if(is_callable($row_callback)){
        for ($row = 1; $row <= $highestRow; $row++){ 
            $rowData = $sheet->rangeToArray('A' . $row . ':' . $highestColumn . $row,null,true,false);
            if ($row === 1){
                $keys = $rowData[0];
            } else {
                $record = array();
                foreach($rowData[0] as $pos=>$value) $record[$keys[$pos]] = $value; 
                $row_callback($record);           
            }
        } 
    } else {            
        for ($row = 1; $row <= $highestRow; $row++){ 
            $rowData = $sheet->rangeToArray('A' . $row . ':' . $highestColumn . $row,null,true,false);
            if ($row === 1){
                $keys = $rowData[0];
            } else {
                $record = array();
                foreach($rowData[0] as $pos=>$value) $record[$keys[$pos]] = $value; 
                $results[] = $record;           
            }
        } 
        return $results;
    }
}