fread() reads up to
length
bytes from the file pointer
referenced by handle
. Reading stops as soon as one
of the following conditions is met:
length
bytes have been read
EOF (end of file) is reached
a packet becomes available (for network streams)
8192 bytes have been read (after opening userspace stream)
Parameters
handle
A file system pointer resource
that is typically created using fopen().
length
Up to length
number of bytes read.
Return Values
Returns the read string or FALSE in case of error.
Examples
Example #1 A simple fread() example
<?php // get contents of a file into a string $filename = "/usr/local/something.txt"; $handle = fopen($filename, "r"); $contents = fread($handle, filesize($filename)); fclose($handle); ?>
Example #2 Binary fread() example
Warning
On systems which differentiate between binary and text files
(i.e. Windows) the file must be opened with 'b' included in
fopen() mode parameter.
When reading from anything that is not a regular local file, such as
streams returned when
reading remote files or from
popen() and fsockopen(), reading
will stop after a packet is available. This means that you should
collect the data together in chunks as shown in the examples below.
<?php // For PHP 5 and up $handle = fopen("http://www.example.com/", "rb"); $contents = stream_get_contents($handle); fclose($handle); ?>
Note:
If you just want to get the contents of a file into a string, use
file_get_contents() as it has much better performance
than the code above.
Note:
Note that fread() reads from the current position of
the file pointer. Use ftell() to find the current
position of the pointer and rewind() to rewind the
pointer position.
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