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Bug #45585 fread() return value for EOF inconsistent between PHP 5 and 6
Submitted: 2008-07-21 16:33 UTC Modified: 2008-11-11 00:42 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: jani@php.net Assigned:
Status: Closed Package: Filesystem function related
PHP Version: 6CVS-2008-07-21 (CVS) OS: *
Private report: No CVE-ID: None
View Add Comment Developer Edit
 [2008-07-21 16:33 UTC] jani@php.net 
Description:
------------
# echo "1" > /tmp/test.txt

# php_5_2/sapi/cli/php -n -r '$fp=fopen("/tmp/test.txt", "r"); while(1) {$a=fread($fp, 8192); if (!$a) {var_dump($a); exit;}}'
string(0) ""

# php_5_3/sapi/cli/php -n -r '$fp=fopen("/tmp/test.txt", "r"); while(1) {$a=fread($fp, 8192); if (!$a) {var_dump($a); exit;}}'
string(0) ""

# php_6/sapi/cli/php -n -r '$fp=fopen("/tmp/test.txt", "r"); while(1) {$a=fread($fp, 8192); if (!$a) {var_dump($a); exit;}}'
bool(false)

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 [2008-07-21 16:34 UTC] jani@php.net 
In 5.2/5.3 it returns empty string, in PHP 6 FALSE.
 [2008-10-21 07:25 UTC] mike at mikegerwitz dot com 
Confirmed in php6.0-200810110430. Cannot reliably loop through data using feof() when recognizing FALSE as an error.

while ( !( feof( $handle ) ) )
{
    if ( ( $text = fread( $handle, 1024 ) ) === FALSE )
    {
        // When attempting to read past the EOF, PHP 6 returns FALSE rather than an empty string
        die( 'Error!' );
    }
    $data .= $text;
}

In PHP < 6, the above code will not display the error. In PHP 6, it does a good job of breaking a lot of code. Is this new functionality intended or are there plans to fix it?
 [2008-11-11 00:42 UTC] lbarnaud@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
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