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

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

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>Manual PHP</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
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>Înapoi</A
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ALIGN="center"
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>Înainte</A
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><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="appendix"
><H1
><A
NAME="types.comparisons"
>Anexa O. PHP type comparison tables</A
></H1
><P
>&#13;  The following tables demonstrate behaviors of PHP 
  <A
HREF="language.types.html"
>types</A
> and 
  <A
HREF="language.operators.comparison.html"
>comparison 
  operators</A
>, for both loose and strict comparisons.  This 
  supplemental is also related to the manual section on 
  <A
HREF="language.types.type-juggling.html"
>type juggling</A
>.
  Inspiration was provided by various user comments and by the work over at
  <A
HREF="http://www.blueshoes.org/en/developer/php_cheat_sheet/"
TARGET="_top"
>BlueShoes</A
>.
 </P
><P
>&#13;  Before utilizing these tables, it's important to understand types and their
  meanings.  For example, <VAR
CLASS="literal"
>"42"</VAR
> is a <A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
> 
  while <VAR
CLASS="literal"
>42</VAR
> is an <A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>.  <TT
CLASS="constant"
><B
>FALSE</B
></TT
> is a
  <A
HREF="language.types.boolean.html"
><B
CLASS="type"
>boolean</B
></A
> while <VAR
CLASS="literal"
>"false"</VAR
> is a
  <A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
>.
 </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
   HTML Forms do not pass integers, floats, or booleans; they pass strings.
   To find out if a string is numeric, you may use
   <A
HREF="function.is-numeric.html"
><B
CLASS="function"
>is_numeric()</B
></A
>.
  </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
   Simply doing <VAR
CLASS="literal"
>if ($x)</VAR
> while <VAR
CLASS="varname"
>$x</VAR
> is
   undefined will generate an error of level <TT
CLASS="constant"
><B
>E_NOTICE</B
></TT
>.
   Instead, consider using <A
HREF="function.empty.html"
><B
CLASS="function"
>empty()</B
></A
> or
   <A
HREF="function.isset.html"
><B
CLASS="function"
>isset()</B
></A
> and/or initialize your variables.
  </P
></BLOCKQUOTE
></DIV
><P
>&#13;  <DIV
CLASS="table"
><A
NAME="AEN141026"
></A
><P
><B
>Tabel O-1. Comparisons of <VAR
CLASS="varname"
>$x</VAR
> with PHP functions</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><COL><COL><THEAD
><TR
><TH
>Expression</TH
><TH
><A
HREF="function.gettype.html"
><B
CLASS="function"
>gettype()</B
></A
></TH
><TH
><A
HREF="function.empty.html"
><B
CLASS="function"
>empty()</B
></A
></TH
><TH
><A
HREF="function.is-null.html"
><B
CLASS="function"
>is_null()</B
></A
></TH
><TH
><A
HREF="function.isset.html"
><B
CLASS="function"
>isset()</B
></A
></TH
><TH
><A
HREF="language.types.boolean.html"
><B
CLASS="type"
>boolean</B
></A
> : <VAR
CLASS="literal"
>if($x)</VAR
></TH
></TR
></THEAD
><TBODY
><TR
><TD
><VAR
CLASS="literal"
>$x = "";</VAR
></TD
><TD
><A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = <TT
CLASS="constant"
><B
>NULL</B
></TT
></VAR
></TD
><TD
><A
HREF="language.types.null.html"
><B
CLASS="type"
>NULL</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>var $x;</VAR
></TD
><TD
><A
HREF="language.types.null.html"
><B
CLASS="type"
>NULL</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="varname"
>$x</VAR
> is undefined</TD
><TD
><A
HREF="language.types.null.html"
><B
CLASS="type"
>NULL</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = array();</VAR
></TD
><TD
><A
HREF="language.types.array.html"
><B
CLASS="type"
>array</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = false;</VAR
></TD
><TD
><A
HREF="language.types.boolean.html"
><B
CLASS="type"
>boolean</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = true;</VAR
></TD
><TD
><A
HREF="language.types.boolean.html"
><B
CLASS="type"
>boolean</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = 1;</VAR
></TD
><TD
><A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = 42;</VAR
></TD
><TD
><A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = 0;</VAR
></TD
><TD
><A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = -1;</VAR
></TD
><TD
><A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = "1";</VAR
></TD
><TD
><A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = "0";</VAR
></TD
><TD
><A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = "-1";</VAR
></TD
><TD
><A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = "php";</VAR
></TD
><TD
><A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = "true";</VAR
></TD
><TD
><A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>$x = "false";</VAR
></TD
><TD
><A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
></TBODY
></TABLE
></DIV
>
 </P
><P
>&#13;  <DIV
CLASS="table"
><A
NAME="AEN141268"
></A
><P
><B
>Tabel O-2. Loose comparisons with <VAR
CLASS="literal"
>==</VAR
></B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><COL><COL><COL><COL><COL><COL><COL><COL><THEAD
><TR
><TH
>&nbsp;</TH
><TH
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TH
><TH
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TH
><TH
><VAR
CLASS="literal"
>1</VAR
></TH
><TH
><VAR
CLASS="literal"
>0</VAR
></TH
><TH
><VAR
CLASS="literal"
>-1</VAR
></TH
><TH
><VAR
CLASS="literal"
>"1"</VAR
></TH
><TH
><VAR
CLASS="literal"
>"0"</VAR
></TH
><TH
><VAR
CLASS="literal"
>"-1"</VAR
></TH
><TH
><TT
CLASS="constant"
><B
>NULL</B
></TT
></TH
><TH
><VAR
CLASS="literal"
>array()</VAR
></TH
><TH
><VAR
CLASS="literal"
>"php"</VAR
></TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>1</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>0</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>-1</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>"1"</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>"0"</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>"-1"</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>NULL</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>array()</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>"php"</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
></TBODY
></TABLE
></DIV
>
 </P
><P
>&#13;  <DIV
CLASS="table"
><A
NAME="AEN141574"
></A
><P
><B
>Tabel O-3. Strict comparisons with <VAR
CLASS="literal"
>===</VAR
></B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><COL><COL><COL><COL><COL><COL><COL><COL><THEAD
><TR
><TH
>&nbsp;</TH
><TH
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TH
><TH
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TH
><TH
><VAR
CLASS="literal"
>1</VAR
></TH
><TH
><VAR
CLASS="literal"
>0</VAR
></TH
><TH
><VAR
CLASS="literal"
>-1</VAR
></TH
><TH
><VAR
CLASS="literal"
>"1"</VAR
></TH
><TH
><VAR
CLASS="literal"
>"0"</VAR
></TH
><TH
><VAR
CLASS="literal"
>"-1"</VAR
></TH
><TH
><TT
CLASS="constant"
><B
>NULL</B
></TT
></TH
><TH
><VAR
CLASS="literal"
>array()</VAR
></TH
><TH
><VAR
CLASS="literal"
>"php"</VAR
></TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>1</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>0</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>-1</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>"1"</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>"0"</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>"-1"</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>NULL</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>array()</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>"php"</VAR
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>FALSE</B
></TT
></TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
></TD
></TR
></TBODY
></TABLE
></DIV
>
 </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>PHP 3.0 note: </B
>
   The string value <VAR
CLASS="literal"
>"0"</VAR
> was considered non-empty in 
   PHP 3, this behavior changed in PHP 4 where it's now seen as empty.
  </P
></BLOCKQUOTE
></DIV
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HREF="index.html"
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