Sophie: php-manual-ro-0:20051028-1 noarch

php-manual-ro-20051028-1.noarch.rpm

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><H1
><A
NAME="function.flock"
></A
>flock</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN28250"
></A
><P
>    (PHP 3&#62;= 3.0.7, PHP 4 , PHP 5)</P
>flock&nbsp;--&nbsp;Portable advisory file locking</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN28253"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>flock</B
> ( resource handle, int operation [, int &#38;wouldblock])<BR
></BR
><P
>&#13;     PHP supports a portable way of locking complete files in an
     advisory way (which means all accessing programs have to use the
     same way of locking or it will not work).
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      <B
CLASS="function"
>flock()</B
> is mandatory under Windows.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     <B
CLASS="function"
>flock()</B
> operates on <VAR
CLASS="parameter"
>handle</VAR
>
     which must be an open file
     pointer. <VAR
CLASS="parameter"
>operation</VAR
> is one of the following
     values:
    </P
><P
>&#13;     <P
></P
><UL
><LI
><P
>&#13;         To acquire a shared lock (reader), set
         <VAR
CLASS="parameter"
>operation</VAR
> to <TT
CLASS="constant"
><B
>LOCK_SH</B
></TT
> (set to 1 prior to
         PHP 4.0.1).
       </P
></LI
><LI
><P
>&#13;         To acquire an exclusive lock (writer), set
         <VAR
CLASS="parameter"
>operation</VAR
> to <TT
CLASS="constant"
><B
>LOCK_EX</B
></TT
> (set to 2 prior to
         PHP 4.0.1).
       </P
></LI
><LI
><P
>&#13;         To release a lock (shared or exclusive), set
         <VAR
CLASS="parameter"
>operation</VAR
> to <TT
CLASS="constant"
><B
>LOCK_UN</B
></TT
> (set to 3 prior to
         PHP 4.0.1).
       </P
></LI
><LI
><P
>&#13;         If you don't want <B
CLASS="function"
>flock()</B
> to block while
         locking, add <TT
CLASS="constant"
><B
>LOCK_NB</B
></TT
> (4 prior to PHP 4.0.1) to
         <VAR
CLASS="parameter"
>operation</VAR
>.
       </P
></LI
></UL
>
    </P
><P
>&#13;     <B
CLASS="function"
>flock()</B
> allows you to perform a simple
     reader/writer model which can be used on virtually every platform
     (including most Unix derivatives and even Windows).  The optional third
     argument is set to <TT
CLASS="constant"
><B
>TRUE</B
></TT
> if the lock would block (EWOULDBLOCK
     errno condition)
    </P
><P
>&#13;      Returneazã <TT
CLASS="constant"
><B
>TRUE</B
></TT
> în caz de succes, <TT
CLASS="constant"
><B
>FALSE</B
></TT
> în caz contrar.
    </P
><P
>&#13;     <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN28301"
></A
><P
><B
>Exemplu 1. <B
CLASS="function"
>flock()</B
> example</B
></P
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">"/tmp/lock.txt"</font><font color="#007700">, </font><font color="#DD0000">"w+"</font><font color="#007700">);<br /><br />if (</font><font color="#0000BB">flock</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">LOCK_EX</font><font color="#007700">)) { </font><font color="#FF8000">// do an exclusive lock<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"Write something here\n"</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">flock</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">LOCK_UN</font><font color="#007700">); </font><font color="#FF8000">// release the lock<br /></font><font color="#007700">} else {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Couldn't lock the file !"</font><font color="#007700">;<br />}<br /><br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      Because <B
CLASS="function"
>flock()</B
> requires a file pointer, you may have
      to use a special lock file to protect access to a file that you intend
      to truncate by opening it in write mode (with a "w" or "w+" argument to
      <A
HREF="function.fopen.html"
><B
CLASS="function"
>fopen()</B
></A
>).
     </P
></BLOCKQUOTE
></DIV
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><TD
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><B
>Avertisment</B
></TD
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><TR
><TD
ALIGN="LEFT"
><P
>&#13;      <B
CLASS="function"
>flock()</B
> will not work on NFS and many other networked
      file systems. Check your operating system documentation for more
      details.
     </P
><P
>&#13;      On some operating systems <B
CLASS="function"
>flock()</B
> is implemented at
      the process level. When using a multithreaded server API like ISAPI you
      may not be able to rely on <B
CLASS="function"
>flock()</B
> to protect files
      against other PHP scripts running in parallel threads of the same server
      instance!
     </P
><P
>&#13;      <B
CLASS="function"
>flock()</B
> is not supported on antiquated filesystems like
      <VAR
CLASS="literal"
>FAT</VAR
> and its derivates and will therefore always
      return <TT
CLASS="constant"
><B
>FALSE</B
></TT
> under this environments (this is especially true for
      Windows 98 users).
     </P
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