Php file download error

Php file download_file ($ filename) {belowtoprovidethedownloadif (file_exists ($ filename) {php file download error
Write a program for downloading files.

PHP code

  function download_file($filename){     //below to provide the download                    if (file_exists($filename)) {                                                 $file = fopen($filename);                    header('Content-Description: File Transfer');                    header('Content-Type: application/octet-stream');                    header('Content-Disposition: attachment; filename=' . basename($filename));                    header('Content-Transfer-Encoding: binary');                    header('Expires: 0');                    header('Cache-Control: must-revalidate');                    header('Pragma: public');                    header('Content-Length: ' . filesize($filename) . ' bytes');                    //ob_clean();                    //flush();                    readfile($filename);                    fclose($file);                    return true;                }else{                    echo("the file not exist");                    return false;                }                //above to provide the download }

But there is no download function. The file has been generated in the previous step. However, if I change "return true" to "exit", the download function can be implemented. However, after downloading an object, I need to perform other functions. Ask the gods what is going on? The download example on the Internet does not mean that exit is required.


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Check where you are calling this function and where you are calling it. is there a problem?
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In this case:

PHP code

If (download_file ($ filename) {# the following operations} else {# error prompt}
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   Discussion
   
Write the PHP code of an object download program.
   
Function download_file ($ filename ){
   
// Below to provide the download
   
If (file_exists ($ filename )){
   
                        
   
$ File ......
   

  
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   Discussion
   

   
Reference:
   

   
In this case:
   
PHP code
   

   
If (download_file ($ filename )){
   
# The following operations
   
} Else {
   
# Error message
   
}
   

   

   

   
I don't quite understand what you said. did you omit the return statement? Return is omitted and cannot be run.
   

  
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Your function return false is equivalent to preventDefault and does not submit a form.
When the answer is met, for example, if the check field is not empty and then return true, the page will jump and your action will be called.
This is a common method for form submission to prevent abnormal submission.