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

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

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><DIV
CLASS="chapter"
><H1
><A
NAME="language.types"
>Cap. 6. Types</A
></H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Cuprins</B
></DT
><DT
><A
HREF="language.types.html#language.types.intro"
>Introduction</A
></DT
><DT
><A
HREF="language.types.boolean.html"
>Booleans</A
></DT
><DT
><A
HREF="language.types.integer.html"
>Integers</A
></DT
><DT
><A
HREF="language.types.float.html"
>Floating point numbers</A
></DT
><DT
><A
HREF="language.types.string.html"
>Strings</A
></DT
><DT
><A
HREF="language.types.array.html"
>Arrays</A
></DT
><DT
><A
HREF="language.types.object.html"
>Objects</A
></DT
><DT
><A
HREF="language.types.resource.html"
>Resource</A
></DT
><DT
><A
HREF="language.types.null.html"
>NULL</A
></DT
><DT
><A
HREF="language.pseudo-types.html"
>Pseudo-types used in this documentation</A
></DT
><DT
><A
HREF="language.types.type-juggling.html"
>Type Juggling</A
></DT
></DL
></DIV
><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="language.types.intro"
>Introduction</A
></H1
><P
>&#13;   PHP supports eight primitive types.
  </P
><P
>&#13;   Four scalar types:

   <P
></P
><UL
><LI
><P
>&#13;      <A
HREF="language.types.boolean.html"
><B
CLASS="type"
>boolean</B
></A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.types.float.html"
><B
CLASS="type"
>float</B
></A
> (floating-point number, aka '<A
HREF="language.types.float.html"
><B
CLASS="type"
>double</B
></A
>')
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
>
     </P
></LI
></UL
>

   Two compound types:

   <P
></P
><UL
><LI
><P
>&#13;      <A
HREF="language.types.array.html"
><B
CLASS="type"
>array</B
></A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.types.object.html"
><B
CLASS="type"
>object</B
></A
>
     </P
></LI
></UL
>

   And finally two special types:

   <P
></P
><UL
><LI
><P
>&#13;      <A
HREF="language.types.resource.html"
><B
CLASS="type"
>resource</B
></A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.types.null.html"
><B
CLASS="type"
>NULL</B
></A
>
     </P
></LI
></UL
>

   This manual also introduces some 
   <A
HREF="language.pseudo-types.html"
>pseudo-types</A
> 
   for readability reasons:

   <P
></P
><UL
><LI
><P
>&#13;      <A
HREF="language.pseudo-types.html#language.types.mixed"
>mixed</A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.pseudo-types.html#language.types.number"
>number</A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.pseudo-types.html#language.types.mixed"
>callback</A
>
     </P
></LI
></UL
>
   You may also find some references to the type "double". Consider
   double the same as float, the two names exist only for historic
   reasons. 
  </P
><P
>&#13;   The type of a variable is usually not set by the programmer;
   rather, it is decided at runtime by PHP depending on the context in
   which that variable is used.
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
    If you want to check out the type and value of a certain <A
HREF="language.expressions.html"
>expression</A
>, use
    <A
HREF="function.var-dump.html"
><B
CLASS="function"
>var_dump()</B
></A
>.
   </P
><P
><B
>Not&#227;: </B
>
    If you simply want a human-readable representation of the type for
    debugging, use <A
HREF="function.gettype.html"
><B
CLASS="function"
>gettype()</B
></A
>. To check for a certain type,
    do <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>not</I
></SPAN
> use <A
HREF="function.gettype.html"
><B
CLASS="function"
>gettype()</B
></A
>, but use the
    <VAR
CLASS="literal"
>is_<VAR
CLASS="replaceable"
>type</VAR
></VAR
> functions. Some
    examples:
    <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN633"
></A
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$bool </font><font color="#007700">= </font><font color="#0000BB">TRUE</font><font color="#007700">;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// a boolean<br /></font><font color="#0000BB">$str&nbsp;&nbsp;</font><font color="#007700">= </font><font color="#DD0000">"foo"</font><font color="#007700">;&nbsp;&nbsp;</font><font color="#FF8000">// a string<br /></font><font color="#0000BB">$int&nbsp;&nbsp;</font><font color="#007700">= </font><font color="#0000BB">12</font><font color="#007700">;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// an integer<br /><br /></font><font color="#007700">echo </font><font color="#0000BB">gettype</font><font color="#007700">(</font><font color="#0000BB">$bool</font><font color="#007700">); </font><font color="#FF8000">// prints out "boolean"<br /></font><font color="#007700">echo </font><font color="#0000BB">gettype</font><font color="#007700">(</font><font color="#0000BB">$str</font><font color="#007700">);&nbsp;&nbsp;</font><font color="#FF8000">// prints out "string"<br /><br />// If this is an integer, increment it by four<br /></font><font color="#007700">if (</font><font color="#0000BB">is_int</font><font color="#007700">(</font><font color="#0000BB">$int</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$int </font><font color="#007700">+= </font><font color="#0000BB">4</font><font color="#007700">;<br />}<br /><br /></font><font color="#FF8000">// If $bool is a string, print it out<br />// (does not print out anything)<br /></font><font color="#007700">if (</font><font color="#0000BB">is_string</font><font color="#007700">(</font><font color="#0000BB">$bool</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"String: $bool"</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><P
></P
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>
   </P
></BLOCKQUOTE
></DIV
><P
>&#13;   If you would like to force a variable to be converted to a certain
   type, you may either <A
HREF="language.types.type-juggling.html#language.types.typecasting"
>cast</A
> the variable or
   use the <A
HREF="function.settype.html"
><B
CLASS="function"
>settype()</B
></A
> function on it.
  </P
><P
>&#13;   Note that a variable may be evaluated with different values in certain
   situations, depending on what type it is at the time. For more
   information, see the section on <A
HREF="language.types.type-juggling.html"
>Type Juggling</A
>.  Also, you 
   may be interested in viewing 
   <A
HREF="types.comparisons.html"
>the type comparison tables</A
>,
   as they show examples of various type related comparisons.
  </P
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