Solution to the problem that Excel cannot be opened when downloaded by PHP_PHP Tutorial

php download excel file,
1. Do not output any non-file information during the download process, such as echo log information. Otherwise, the downloaded file cannot be opened, prompting a format error or the file is damaged.
2. The output excel format must be saved with the suffix name, otherwise it will prompt a format error or the file will be damaged

Copy code The code is as follows:

if (file_exists(CACHE_PATH . $file_name)){
                                          //$this ->logger->error('file realpath:'.realpath(CACHE_PATH . $file_name));
header( 'Pragma: public' );
header( 'Expires: 0' );
header( 'Content-Encoding: none' );
header( 'Cache-Control: must-revalidate, post-check=0, pre-check=0' );
header( 'Cache-Control: public' );
header( 'Content-Type: application/vnd.ms-excel');
header( 'Content-Description: File Transfer' );
header( 'Content-Disposition: attachment ; filename=' . $file_name );
header( 'Content-Transfer-Encoding: binary' );
header( 'Content-Length: ' . filesize ( CACHE_PATH . $file_name ) );
readfile ( CACHE_PATH . $file_name );
} else {
$this->logger->error('export model :'.$id.' Error: File not produced');
echo ' <script>alert('export error, file not exists!')</script>';
}

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