(PHP 5 >= 5.1.0, PHP 7)
SplFileObject::fpassthru — Output all remaining data on a file pointer
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.
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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;
?>