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>microtime</H1
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><P
> (PHP 3, PHP 4, PHP 5)</P
>microtime --
Retorna um timestamp Unix com microsegundos
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><H2
>Descrição</H2
>mixed <B
CLASS="methodname"
>microtime</B
> ( [bool get_as_float] )<BR
></BR
><P
> A <B
CLASS="function"
>microtime()</B
> retorna o timestamp atual com microsegundos. Esta função
está apenas disponível em sistemas operacionais que suportam o chamda do sistema
gettimeofday().
</P
><P
> Quando chamada sem o argumento opcional, esta função retorna a string
"msec sec" onde sec é o a hora atual medida em segundos desde a era UNIX
(0:00:00 January 1, 1970 GMT), e msec é a parte em microsegundos.
Ambas porções de string são retornadas em segundos.
</P
><P
> Quando <CODE
CLASS="parameter"
>get_as_float</CODE
> é dado, e avalia para
<TT
CLASS="constant"
><B
>TRUE</B
></TT
>, <B
CLASS="function"
>microtime()</B
> retornará um tipo float.
</P
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><P
><B
>Nota: </B
>
O parâmetro <CODE
CLASS="parameter"
>get_as_float</CODE
> foi adicionado no
<TT
CLASS="literal"
>PHP 5.0.0</TT
>.
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><P
><B
>Exemplo 1. <B
CLASS="function"
>microtime()</B
> exemplo</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br /></font><font color="#007700">function </font><font color="#0000BB">getmicrotime</font><font color="#007700">() <br />{ <br /> list(</font><font color="#0000BB">$usec</font><font color="#007700">, </font><font color="#0000BB">$sec</font><font color="#007700">) = </font><font color="#0000BB">explode</font><font color="#007700">(</font><font color="#DD0000">" "</font><font color="#007700">, </font><font color="#0000BB">microtime</font><font color="#007700">()); <br /> return ((float)</font><font color="#0000BB">$usec </font><font color="#007700">+ (float)</font><font color="#0000BB">$sec</font><font color="#007700">); <br />} <br /><br /></font><font color="#0000BB">$time_start </font><font color="#007700">= </font><font color="#0000BB">getmicrotime</font><font color="#007700">();<br /> <br />for (</font><font color="#0000BB">$i</font><font color="#007700">=</font><font color="#0000BB">0</font><font color="#007700">; </font><font color="#0000BB">$i </font><font color="#007700">< </font><font color="#0000BB">1000</font><font color="#007700">; </font><font color="#0000BB">$i</font><font color="#007700">++){<br /> </font><font color="#FF8000">//do nothing, 1000 times<br /> </font><font color="#007700">}<br /><br /></font><font color="#0000BB">$time_end </font><font color="#007700">= </font><font color="#0000BB">getmicrotime</font><font color="#007700">();<br /></font><font color="#0000BB">$time </font><font color="#007700">= </font><font color="#0000BB">$time_end </font><font color="#007700">- </font><font color="#0000BB">$time_start</font><font color="#007700">;<br /><br />echo </font><font color="#DD0000">"Did nothing in $time seconds</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">// with PHP 5 you can do the same this way:<br /> <br /> </font><font color="#0000BB">$time_start </font><font color="#007700">= </font><font color="#0000BB">microtime</font><font color="#007700">(</font><font color="#0000BB">1</font><font color="#007700">);<br /> <br /> for (</font><font color="#0000BB">$i</font><font color="#007700">=</font><font color="#0000BB">0</font><font color="#007700">; </font><font color="#0000BB">$i </font><font color="#007700">< </font><font color="#0000BB">1000</font><font color="#007700">; </font><font color="#0000BB">$i</font><font color="#007700">++){<br /> </font><font color="#FF8000">// do nothing, 1000 times<br /> </font><font color="#007700">}<br /> <br /> </font><font color="#0000BB">$time_end </font><font color="#007700">= </font><font color="#0000BB">microtime</font><font color="#007700">(</font><font color="#0000BB">1</font><font color="#007700">);<br /> </font><font color="#0000BB">$time </font><font color="#007700">= </font><font color="#0000BB">$time_end </font><font color="#007700">- </font><font color="#0000BB">$time_start</font><font color="#007700">;<br /> <br /> echo </font><font color="#DD0000">"Did nothing in $time seconds</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /></font><font color="#0000BB">?></font>
</font>
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><P
> Veja também <A
HREF="function.time.html"
><B
CLASS="function"
>time()</B
></A
>.
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