PHP calls Linux command line to execute file compression command_PHP tutorial

/*Split into 3 txt files: wow_1.txt wow_2.txt and wow_3.txt*/
$zip=new ZipArchive();
$zipfile='./Exl_file/wow.zip';
if($zip->open($zipfile,ZIPARCHIVE:: CREATE)===TRUE){
$zip->addFile('./Exl_file/wow_1.txt','wow_1.txt');
$zip->addFile('./Exl_file/ wow_2.txt','wow_2.txt');
$zip->addFile('./Exl_file/wow_3.txt','wow_3.txt');
$zip->close() ;
//Delete the relevant files after downloading the output file
}else{
echo "ZIP generation failed!";
}

/*Split into 3 txt files: wow_1.txt wow_2.txt and Put all wow_3.txt in the Exl_file directory*/
$outputs=array();
/*Use php's exec to execute the Linux command. The string in the brackets is the command you type in the Linux command window;
The second parameter is the result array returned by Linux after executing the command;
Each result returned by Linux execution is stored in the array in turn
The third parameter is the result. If the execution is successful, Linux returns the result The value is 0. If the execution fails, the result value is not 0
*/
exec("zip ./Exl_file/wow.zip ./Exl_file/wow_1.txt ./Exl_file/wow_2.txt ./Exl_file /wow_3.txt",$outputs,$rc);
if($rc!=0){
foreach ($outputs as $ko=>$vo){
echo "$vo< br/>";
}
}else{
$zipfile='./Exl_file/wow.zip';
//Delete the relevant files after downloading and outputting the file
}
}

adding: Exl_file/wow_1.txt (deflated 96%)
adding: Exl_file/wow_2.txt (deflated 97 %)
adding: Exl_file/wow_3.txt (deflated 97%)