Description:
------------
EAGAIN/EWOULDBLOCK writes result in a notice for non-blocking socket streams. Since PHP 7.4 additionally false will be returned.

Test script:
---------------
<?php error_reporting(E_ALL);
  
[$sock1, $sock2] = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
$str = str_repeat('a', 1000000);
stream_set_blocking($sock1, false);
var_dump(fwrite($sock1, $str));
var_dump(fwrite($sock1, $str));


Expected result:
----------------
int(196608)
int(0)

Actual result:
--------------
Notice: fwrite(): send of 8192 bytes failed with errno=11 Resource temporarily unavailable in /home/nikic/php-7.4/t246.php on line 6
int(196608)

Notice: fwrite(): send of 8192 bytes failed with errno=11 Resource temporarily unavailable in /home/nikic/php-7.4/t246.php on line 7
bool(false)