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

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

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>Manual PHP</TH
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><A
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>Înapoi</A
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>Anexa B. Migrating from PHP 4 to PHP 5</TD
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CLASS="section"
><H1
CLASS="section"
><A
NAME="migration5.incompatible"
>Backward Incompatible Changes</A
></H1
><P
>&#13;    Although most existing PHP 4 code should work without changes, you should
    pay attention to the following backward incompatible changes:
   </P
><P
></P
><UL
><LI
><P
>&#13;      <A
HREF="function.strrpos.html"
><B
CLASS="function"
>strrpos()</B
></A
> and <A
HREF="function.strripos.html"
><B
CLASS="function"
>strripos()</B
></A
> now use
      the entire string as a needle.
    </P
></LI
><LI
><P
>&#13;      Illegal use of string offsets causes <TT
CLASS="constant"
><B
>E_ERROR</B
></TT
> instead
      of <TT
CLASS="constant"
><B
>E_WARNING</B
></TT
>.
    </P
></LI
><LI
><P
>&#13;      <A
HREF="function.array-merge.html"
><B
CLASS="function"
>array_merge()</B
></A
> was changed to accept only arrays. If a
      non-array variable is passed, a <TT
CLASS="constant"
><B
>E_WARNING</B
></TT
> will be
      thrown for every such parameter. Be careful because your code may start
      emitting <TT
CLASS="constant"
><B
>E_WARNING</B
></TT
> out of the blue.
    </P
></LI
><LI
><P
>&#13;     PATH_TRANSLATED server variable is no longer set implicitly under
     Apache2 SAPI in contrast to the situation in PHP 4, where it is set to
     the same value as the SCRIPT_FILENAME server variable when it is not
     populated by Apache. This change was made to comply with the <A
HREF="http://hoohoo.ncsa.uiuc.edu/cgi/"
TARGET="_top"
>CGI specification</A
>. Please refer to <A
HREF="http://bugs.php.net/23610"
TARGET="_top"
>bug #23610</A
> for further information.
    </P
></LI
><LI
><P
>&#13;     The <TT
CLASS="constant"
><B
>T_ML_CONSTANT</B
></TT
> constant is no longer defined by
     the <A
HREF="ref.tokenizer.html"
>Tokenizer</A
> extension. If
     error_reporting is set to <TT
CLASS="constant"
><B
>E_ALL</B
></TT
>, PHP will generate a
     notice. Although the <TT
CLASS="constant"
><B
>T_ML_CONSTANT</B
></TT
> was never used
     at all, it was defined in PHP 4. In both PHP 4 and PHP 5  // and /* */
     are resolved as the <TT
CLASS="constant"
><B
>T_COMMENT</B
></TT
> constant. However the
     PHPDoc style comments /** */ ,which starting PHP 5 are parsed by PHP, are
     recognized as <TT
CLASS="constant"
><B
>T_DOC_COMMENT</B
></TT
>.
    </P
></LI
><LI
><P
>&#13;      $_SERVER should be populated with argc and argv if  <A
HREF="ini.sect.data-handling.html#ini.variables-order"
>variables_order</A
> includes "S". If
      you have specifically configured your system to not create $_SERVER,
      then of course it shouldn't be there. The change was to always make argc
      and argv available in the CLI version regardless of the <A
HREF="ini.sect.data-handling.html#ini.variables-order"
>variables_order</A
> setting. As in,
      the CLI version will now always populate the global $argc and $argv
      variables.
    </P
></LI
><LI
><P
>&#13;      An object with no properties is no longer considered "empty".
    </P
></LI
><LI
><P
>&#13;     In some cases classes must be declared before used. It only happens only
     if some of the new features of PHP 5 are used. Otherwise the behaviour is
     the old.
    </P
></LI
><LI
><P
>&#13;      <A
HREF="function.get-class.html"
><B
CLASS="function"
>get_class()</B
></A
> starting PHP 5 returns the name of the
      class as it was declared which may lead to problems in older scripts
      that rely on the previous behaviour (the class name was lowercased).
      A possible solution is to search for <A
HREF="function.get-class.html"
><B
CLASS="function"
>get_class()</B
></A
> in
      all your scripts and use <A
HREF="function.strtolower.html"
><B
CLASS="function"
>strtolower()</B
></A
>.
    </P
></LI
><LI
><P
>&#13;      <A
HREF="function.ip2long.html"
><B
CLASS="function"
>ip2long()</B
></A
> now returns FALSE when an invalid IP
      address is passed as argument to the function, and no longer
      <VAR
CLASS="literal"
>-1</VAR
>.
    </P
></LI
></UL
><P
>&#13;    <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN132074"
></A
><P
><B
>Exemplu B-1. <A
HREF="function.strrpos.html"
><B
CLASS="function"
>strrpos()</B
></A
> and <A
HREF="function.strripos.html"
><B
CLASS="function"
>strripos()</B
></A
> now
      use the entire string as a needle</B
></P
><TABLE
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BGCOLOR="#E0E0E0"
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><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />var_dump</font><font color="#007700">(</font><font color="#0000BB">strrpos</font><font color="#007700">(</font><font color="#DD0000">'ABCDEF'</font><font color="#007700">,</font><font color="#DD0000">'DEF'</font><font color="#007700">)); </font><font color="#FF8000">//int(3)<br /><br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">strrpos</font><font color="#007700">(</font><font color="#DD0000">'ABCDEF'</font><font color="#007700">,</font><font color="#DD0000">'DAF'</font><font color="#007700">)); </font><font color="#FF8000">//bool(false)<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
   </P
><P
>&#13;    <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN132080"
></A
><P
><B
>Exemplu B-2. An object with no properties is no longer considered "empty"</B
></P
><TABLE
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BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">class </font><font color="#0000BB">test </font><font color="#007700">{ }<br /></font><font color="#0000BB">$t </font><font color="#007700">= new </font><font color="#0000BB">test</font><font color="#007700">();<br /><br /></font><font color="#0000BB">var_dump</font><font color="#007700">(empty(</font><font color="#0000BB">$t</font><font color="#007700">)); </font><font color="#FF8000">// echo bool(false)<br /><br /></font><font color="#007700">if (!</font><font color="#0000BB">$t</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// Will be executed<br /></font><font color="#007700">}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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></TD
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>
   </P
><P
>&#13;    <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN132084"
></A
><P
><B
>Exemplu B-3. In some cases classes must be declared before used</B
></P
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br /></font><font color="#FF8000">//works with no errors:<br /></font><font color="#0000BB">$a </font><font color="#007700">= new </font><font color="#0000BB">a</font><font color="#007700">();<br />class </font><font color="#0000BB">a </font><font color="#007700">{<br />}<br /><br /><br /></font><font color="#FF8000">//throws an error:<br /></font><font color="#0000BB">$a </font><font color="#007700">= new </font><font color="#0000BB">b</font><font color="#007700">();<br /><br /></font><font color="#0000BB">interface c</font><font color="#007700">{<br />}<br />class </font><font color="#0000BB">b implements c </font><font color="#007700">{<br />} <br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
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