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背景

• 近期在做 excel文件数据导出时，遇到如下报错： iconv(): Detected an illegal character in input string
• 场景：计划任务后台，分步导出 大数据 excel文件
• 发现在加载文件时，会有报错

报错信息 如下：

{"name": "PHP Notice","message": "iconv(): Detected an illegal character in input string","code": 8,"type": "yii\\base\\ErrorException","file": "/usr/share/nginx/html/ycsh_automat/Classes/PHPExcel/Shared/String.php","line": 490,"stack-trace": ["#0 [internal function]: yii\\base\\ErrorHandler->handleError(8, 'iconv(): Detect...', '/usr/share/ngin...', 493, Array)", "#1 /usr/share/nginx/html/ycsh_automat/Classes/PHPExcel/Shared/String.php(490): iconv('CP1252', 'UTF-8', '\\xE8\\xAE\\xA2\\xE5\\x8D\\x95\\xE5\\x88\\x97\\xE8\\xA1\\xA8\\x00\\x00\\x00...')", "#2 /usr/share/nginx/html/ycsh_automat/Classes/PHPExcel/Reader/Excel5.php(1362): PHPExcel_Shared_String::ConvertEncoding('\\xE8\\xAE\\xA2\\xE5\\x8D\\x95\\xE5\\x88\\x97\\xE8\\xA1\\xA8\\x00\\x00\\x00...', 'UTF-8', 'CP1252')", "#3 /usr/share/nginx/html/ycsh_automat/Classes/PHPExcel/Reader/Excel5.php(633): PHPExcel_Reader_Excel5->readSummaryInformation()", "#4 /usr/share/nginx/html/ycsh_automat/Classes/PHPExcel/IOFactory.php(192): PHPExcel_Reader_Excel5->load('/usr/share/ngin...')", "#5 /usr/share/nginx/html/ycsh_automat/common/services/ExcelMzService.php(154): PHPExcel_IOFactory::load('/usr/share/ngin...')", "#6 /usr/share/nginx/html/ycsh_automat/common/models/ExportTask.php(306): common\\services\\ExcelMzService->cronCreateExportFile(Array, Array, '/usr/share/ngin...', Array, '\\xE8\\xAE\\xA2\\xE5\\x8D\\x95\\xE5\\x88\\x97\\xE8\\xA1\\xA8')", "#7 /usr/share/nginx/html/ycsh_automat/api/controllers/CronController.php(54): common\\models\\ExportTask::execExportTask(Object(common\\models\\ExportTask), 1, '{\"search_params...')", "#8 [internal function]: api\\controllers\\CronController->actionRunExportTask()", ...
}

问题分析

1. 根据详细报错信息，可以知道，是执行 PHPExcel_IOFactory::load() 方法时，因为文件名编码问题造成程序中断
2. 业务场景中，即在分步追加 excel文件数据，加载文件名时，识别转码有误
3. 继而定位到 Classes\PHPExcel\Shared\String.php 的 ConvertEncoding() 方法的的第一个条件判断不满足

解决方案

• 修改文件 Classes\PHPExcel\Shared\String.php 的 ConvertEncoding() 方法的的第一个条件判断，如下
  

附录

1. 网上的经验，基本为 php iconv() : Detected an illegal character in input string, 测试发现都无法解决我的问题
2. 重点提示：当前报错，在 windows 环境中，不会报错，只有上传到 Linux 服务器，才会有报错！