为什么PHP的zip_read（）返回false？

Question

Why is PHP's zip_read() returning false? I've used this same script before, and it returned true.

$zip = zip_open("/tmp/ayb/test.zip");
if(is_resource($zip))
{
    $zip_read=zip_read($zip);
    echo($zip_read?'true':'false');
}

Answer 1

Scripts don't magically invert their behaviour for no reason. You changed something. You did something wrong. Don't blame the script. The ZIP got corrupted, or it's a different ZIP, or it's not there any more.

The relevant manual page tells us:

Returns a directory entry resource for later use with the zip_entry_... functions, or FALSE if there are no more entries to read, or an error code if an error occurred.

Note that this means you should be testing $zip_read for more than basic truthiness. You should be examining it more closely for its precise value, and take your debugging from there.