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php-manual-pt_BR-5.2.4-1mdv2008.1.noarch.rpm

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><H1
><A
NAME="function.print-r"
></A
>print_r</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN230310"
></A
><P
>    (PHP 4, PHP 5)</P
>print_r&nbsp;--&nbsp;
     Prints human-readable information about a variable
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN230313"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>print_r</B
> ( mixed expression [, bool return] )<BR
></BR
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
      The <CODE
CLASS="parameter"
>return</CODE
> parameter was added in PHP 4.3.0
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     <B
CLASS="function"
>print_r()</B
> displays information about a variable
     in a way that's readable by humans.  If given a <A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
>,
     <A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
> or <A
HREF="language.types.float.html"
><B
CLASS="type"
>float</B
></A
>, the value itself will be
     printed.  If given an <A
HREF="language.types.array.html"
><B
CLASS="type"
>array</B
></A
>,
     values will be presented in a format that shows keys and
     elements.  Similar notation is used for <A
HREF="language.types.object.html"
><B
CLASS="type"
>object</B
></A
>s.
     <B
CLASS="function"
>print_r()</B
>, <A
HREF="function.var-dump.html"
><B
CLASS="function"
>var_dump()</B
></A
> and
     <A
HREF="function.var-export.html"
><B
CLASS="function"
>var_export()</B
></A
> will
     also show protected and private properties of objects with PHP 5.
    </P
><P
>&#13;     Remember that <B
CLASS="function"
>print_r()</B
> will move the array
     pointer to the end. Use <A
HREF="function.reset.html"
><B
CLASS="function"
>reset()</B
></A
> to bring
     it back to beginning.
    </P
><P
>&#13;     <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN230341"
></A
><TABLE
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><TD
><code><font color="#000000">
&lt;pre&gt;<br /><font color="#0000BB">&lt;?php<br />&nbsp;&nbsp;&nbsp;&nbsp;$a </font><font color="#007700">= array (</font><font color="#DD0000">'a' </font><font color="#007700">=&gt; </font><font color="#DD0000">'apple'</font><font color="#007700">, </font><font color="#DD0000">'b' </font><font color="#007700">=&gt; </font><font color="#DD0000">'banana'</font><font color="#007700">, </font><font color="#DD0000">'c' </font><font color="#007700">=&gt; array (</font><font color="#DD0000">'x'</font><font color="#007700">, </font><font color="#DD0000">'y'</font><font color="#007700">, </font><font color="#DD0000">'z'</font><font color="#007700">));<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">print_r </font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;<br /></font>&lt;/pre&gt;</font>
</code></TD
></TR
></TABLE
><P
>O exemplo acima irá imprimir:</P
><TABLE
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><TR
><TD
><PRE
CLASS="screen"
>&#60;pre&#62;
Array
(
    [a] =&#62; apple
    [b] =&#62; banana
    [c] =&#62; Array
        (
            [0] =&#62; x
            [1] =&#62; y
            [2] =&#62; z
        )
)
&#60;/pre&#62;</PRE
></TD
></TR
></TABLE
><P
></P
></DIV
>
    </P
><P
>&#13;     If you would like to capture the output of <B
CLASS="function"
>print_r()</B
>, 
     use the <CODE
CLASS="parameter"
>return</CODE
> parameter.  If this parameter is set
     to <TT
CLASS="constant"
><B
>TRUE</B
></TT
>, <B
CLASS="function"
>print_r()</B
> will return its output, instead of
     printing it (which it does by default).
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>Esta função usa internemente o
  buffer de saída com este parãmetro, assim não pode ser usada dentro
  da função de callback <A
HREF="function.ob-start.html"
><B
CLASS="function"
>ob_start()</B
></A
>.</P
></BLOCKQUOTE
></DIV
><P
>&#13;     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN230354"
></A
><P
><B
>Exemplo 1. <CODE
CLASS="parameter"
>return</CODE
> parameter example</B
></P
><TABLE
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><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />&nbsp;&nbsp;&nbsp;&nbsp;$b </font><font color="#007700">= array (</font><font color="#DD0000">'m' </font><font color="#007700">=&gt; </font><font color="#DD0000">'monkey'</font><font color="#007700">, </font><font color="#DD0000">'foo' </font><font color="#007700">=&gt; </font><font color="#DD0000">'bar'</font><font color="#007700">, </font><font color="#DD0000">'x' </font><font color="#007700">=&gt; array (</font><font color="#DD0000">'x'</font><font color="#007700">, </font><font color="#DD0000">'y'</font><font color="#007700">, </font><font color="#DD0000">'z'</font><font color="#007700">));<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$results </font><font color="#007700">= </font><font color="#0000BB">print_r</font><font color="#007700">(</font><font color="#0000BB">$b</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">); </font><font color="#FF8000">//$results now contains output from print_r<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
      If you need to capture the output of <B
CLASS="function"
>print_r()</B
> with a
      version of PHP prior to 4.3.0, use the <A
HREF="ref.outcontrol.html"
>&#13;      output-control functions</A
>.
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
      Prior to PHP 4.0.4, <B
CLASS="function"
>print_r()</B
> will continue forever
      if given an <A
HREF="language.types.array.html"
><B
CLASS="type"
>array</B
></A
> or <A
HREF="language.types.object.html"
><B
CLASS="type"
>object</B
></A
> that
      contains a direct or indirect reference to itself.  An example
      is <TT
CLASS="literal"
>print_r($GLOBALS)</TT
> because
      <TT
CLASS="literal"
>$GLOBALS</TT
> is itself a global variable that
      contains a reference to itself.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     See also <A
HREF="function.ob-start.html"
><B
CLASS="function"
>ob_start()</B
></A
>,
     <A
HREF="function.var-dump.html"
><B
CLASS="function"
>var_dump()</B
></A
> and
     <A
HREF="function.var-export.html"
><B
CLASS="function"
>var_export()</B
></A
>.
    </P
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