WC_Download_Handler::readfile_chunked( string $file, int $start, int $length )
Read file chunked.
Description Description
Reads file in chunks so big downloads are possible without changing PHP.INI – http://codeigniter.com/wiki/Download_helper_for_large_files/.
Parameters Parameters
- $file
-
(Required) File.
- $start
-
(Required) Byte offset/position of the beginning from which to read from the file.
- $length
-
(Required) Length of the chunk to be read from the file in bytes, 0 means full file.
Return Return
(bool) Success or fail
Source Source
File: includes/class-wc-download-handler.php
public static function readfile_chunked( $file, $start = 0, $length = 0 ) {
if ( ! defined( 'WC_CHUNK_SIZE' ) ) {
define( 'WC_CHUNK_SIZE', 1024 * 1024 );
}
$handle = @fopen( $file, 'r' ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged, WordPress.WP.AlternativeFunctions.file_system_read_fopen
if ( false === $handle ) {
return false;
}
if ( ! $length ) {
$length = @filesize( $file ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
}
$read_length = (int) WC_CHUNK_SIZE;
if ( $length ) {
$end = $start + $length - 1;
@fseek( $handle, $start ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
$p = @ftell( $handle ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
while ( ! @feof( $handle ) && $p <= $end ) { // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
// Don't run past the end of file.
if ( $p + $read_length > $end ) {
$read_length = $end - $p + 1;
}
echo @fread( $handle, $read_length ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged, WordPress.XSS.EscapeOutput.OutputNotEscaped, WordPress.WP.AlternativeFunctions.file_system_read_fread
$p = @ftell( $handle ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
if ( ob_get_length() ) {
ob_flush();
flush();
}
}
} else {
while ( ! @feof( $handle ) ) { // @codingStandardsIgnoreLine.
echo @fread( $handle, $read_length ); // @codingStandardsIgnoreLine.
if ( ob_get_length() ) {
ob_flush();
flush();
}
}
}
return @fclose( $handle ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged, WordPress.WP.AlternativeFunctions.file_system_read_fclose
}