(PHP 5 >= 5.1.0, PHP 7)
SplFileObject::fpassthru — Output all remaining data on a file pointer
public SplFileObject::fpassthru ( ) : int
Reads to EOF on the given file pointer from the current position and writes the results to the output buffer.
You may need to call SplFileObject::rewind() to reset the file pointer to the beginning of the file if you have already written data to the file.
This function has no parameters.
Returns the number of characters read from handle and passed through to the output.
Example #1 SplFileObject::fpassthru() example
<?php
// Open the file in binary mode
$file = new SplFileObject("./img/ok.png", "rb");
// Send the right headers
header("Content-Type: image/png");
header("Content-Length: " . $file->getSize());
// Dump the picture and end script
$file->fpassthru();
exit;
?>
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https://www.php.net/manual/en/splfileobject.fpassthru.php