php-doc-en/reference/sockets/errors.xml

<?xml version="1.0" encoding="utf-8"?>
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<chapter xml:id="sockets.errors" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>Socket Errors</title>
 <para>
  The socket extension was written to provide a usable interface to the
  powerful BSD sockets. Care has been taken that the functions work equally
  well on Win32 and Unix implementations. Almost all of the sockets
  functions may fail under certain conditions and therefore emit an
  <constant>E_WARNING</constant> message describing the error. Sometimes this
  doesn't happen to the desire of the developer. For example the function
  <function>socket_read</function> may suddenly emit an
  <constant>E_WARNING</constant> message because the connection broke
  unexpectedly. It's common to suppress the warning with the
  <literal>@</literal>-operator and catch the error code within the
  application with the <function>socket_last_error</function> function. You
  may call the <function>socket_strerror</function> function with this error
  code to retrieve a string describing the error. See their description for
  more information.
 </para>
 <note>
  <para>
   The <constant>E_WARNING</constant> messages generated by the socket
   extension are in English though the retrieved error message will appear
   depending on the current locale (<constant>LC_MESSAGES</constant>):
   <screen>
<![CDATA[
Warning - socket_bind() unable to bind address [98]: Die Adresse wird bereits verwendet
]]>
   </screen>
  </para>
 </note>
</chapter>

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