php-doc-en/reference/network/functions/socket-set-blocking.xml

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  <refentry id="function.socket-set-blocking">
   <refnamediv>
    <refname>socket_set_blocking</refname>
    <refpurpose>Set blocking/non-blocking mode on a socket</refpurpose> 
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>socket_set_blocking</methodname>
      <methodparam><type>resource</type><parameter>socket descriptor</parameter></methodparam>
      <methodparam><type>int</type><parameter>mode</parameter></methodparam>
     </methodsynopsis>
    <para>
     If <parameter>mode</parameter> is &false;, the given socket
     descriptor will be switched to non-blocking mode, and if &true;, it
     will be switched to blocking mode.  This affects calls like
     <function>fgets</function> that read from the socket.  In
     non-blocking mode an <function>fgets</function> call will always
     return right away while in blocking mode it will wait for data to
     become available on the socket.
    </para>
    <para>
     This function was previously called as
     <function>set_socket_blocking</function> but this usage is deprecated.
    </para>
   </refsect1>
  </refentry>

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