cvs: phpdoc-zh /language variables.xml
| From: | Gang Chen | Date: | Wed, 17 Dec 2008 09:00:49 +0000 |
| Subject: | cvs: phpdoc-zh /language variables.xml | ||
| Groups: | php.doc.zh | ||
| Request: | Send a blank email to doc-zh+get-3114@lists.php.net to get a copy of this message | ||
eniac2008 Wed Dec 17 09:00:49 2008 UTC
Modified files:
/phpdoc-zh/language variables.xml
Log:
sync with EN-Revision: 1.107
http://cvs.php.net/viewvc.cgi/phpdoc-zh/language/variables.xml?r1=1.23&r2=1.24&diff_format=u Index: phpdoc-zh/language/variables.xml diff -u phpdoc-zh/language/variables.xml:1.23 phpdoc-zh/language/variables.xml:1.24 --- phpdoc-zh/language/variables.xml:1.23 Sun Dec 14 07:51:38 2008 +++ phpdoc-zh/language/variables.xml Wed Dec 17 09:00:48 2008 @@ -1,8 +1,8 @@ <?xml version="1.0" encoding="gb2312"?> -<!-- $Revision: 1.23 $ --> +<!-- $Revision: 1.24 $ --> <!-- $Author: eniac2008 $ --> -<!-- EN-Revision: 1.90 Maintainer: verdana Status: ready --> -<!-- CREDITS: dallas, Gregory --> +<!-- EN-Revision: 1.107 Maintainer: Altair Status: ready --> +<!-- CREDITS: dallas, Gregory, verdana --> <chapter xml:id="language.variables" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink"> <title>±äÁ¿</title> @@ -23,6 +23,14 @@ ÔÚ´ËËù˵µÄ×ÖĸÊÇ a-z£¬A-Z£¬ÒÔ¼° ASCII ×Ö·û´Ó 127 µ½ 255£¨0x7f-0xff£©¡£ </simpara> </note> + <note> + <simpara> + <literal>$this</literal> ÊÇÒ»¸öÌØÊâµÄ±äÁ¿£¬Ëü²»Äܱ»¸³Öµ¡£ + </simpara> + </note> + + &tip.userlandnaming; + <para> ÓйرäÁ¿µÄº¯ÊýÐÅÏ¢¼û<link linkend="ref.var">±äÁ¿º¯Êý</link>¡£ </para> @@ -45,10 +53,10 @@ </para> <para> - PHP 3 ÖУ¬±äÁ¿×ÜÊÇ´«Öµ¸³Öµ¡£ÄÇÒ²¾ÍÊÇ˵£¬µ±½«Ò»¸ö±í´ïʽµÄÖµ¸³ÓèÒ»¸ö±äÁ¿Ê±£¬Õû¸öÔʼ±í´ïʽµÄÖµ±»¸³Öµµ½Ä¿±ê±äÁ¿¡£ÕâÒâζ×Å£¬ÀýÈ磬µ±Ò»¸ö±äÁ¿µÄÖµ¸³ÓèÁíÍâÒ»¸ö±äÁ¿Ê±£¬¸Ä±äÆäÖÐÒ»¸ö±äÁ¿µÄÖµ£¬½«²»»áÓ°Ïìµ½ÁíÍâÒ»¸ö±äÁ¿¡£ÓйØÕâÖÖÀàÐ͵ĸ³Öµ²Ù×÷£¬Çë²ÎÔÄ<link linkend="language.expressions">±í´ïʽ</link>Ò»Õ¡£ + ±äÁ¿Ä¬ÈÏ×ÜÊÇ´«Öµ¸³Öµ¡£ÄÇÒ²¾ÍÊÇ˵£¬µ±½«Ò»¸ö±í´ïʽµÄÖµ¸³ÓèÒ»¸ö±äÁ¿Ê±£¬Õû¸öÔʼ±í´ïʽµÄÖµ±»¸³Öµµ½Ä¿±ê±äÁ¿¡£ÕâÒâζ×Å£¬ÀýÈ磬µ±Ò»¸ö±äÁ¿µÄÖµ¸³ÓèÁíÍâÒ»¸ö±äÁ¿Ê±£¬¸Ä±äÆäÖÐÒ»¸ö±äÁ¿µÄÖµ£¬½«²»»áÓ°Ïìµ½ÁíÍâÒ»¸ö±äÁ¿¡£ÓйØÕâÖÖÀàÐ͵ĸ³Öµ²Ù×÷£¬Çë²ÎÔÄ<link linkend="language.expressions">±í´ïʽ</link>Ò»Õ¡£ </para> <para> - PHP 4 ÌṩÁËÁíÍâÒ»ÖÖ·½Ê½¸ø±äÁ¿¸³Öµ£º<link linkend="language.references">ÒýÓø³Öµ</link>¡£ÕâÒâζ×ÅеıäÁ¿¼òµ¥µÄÒýÓ㨻»ÑÔÖ®£¬¡°³ÉΪÆä±ðÃû¡± »òÕß ¡°Ö¸Ïò¡±£©ÁËÔʼ±äÁ¿¡£¸Ä¶¯ÐµıäÁ¿½«Ó°Ïìµ½Ôʼ±äÁ¿£¬·´Ö®ÒàÈ»¡£ + PHP Ò²ÌṩÁËÁíÍâÒ»ÖÖ·½Ê½¸ø±äÁ¿¸³Öµ£º<link linkend="language.references">ÒýÓø³Öµ</link>¡£ÕâÒâζ×ÅеıäÁ¿¼òµ¥µÄÒýÓ㨻»ÑÔÖ®£¬¡°³ÉΪÆä±ðÃû¡± »òÕß ¡°Ö¸Ïò¡±£©ÁËÔʼ±äÁ¿¡£¸Ä¶¯ÐµıäÁ¿½«Ó°Ïìµ½Ôʼ±äÁ¿£¬·´Ö®ÒàÈ»¡£ </para> <para> ʹÓÃÒýÓø³Öµ£¬¼òµ¥µØ½«Ò»¸ö & @@ -57,11 +65,11 @@ <programlisting role="php"> <![CDATA[ <?php -$foo = 'Bob'; // Assign the value 'Bob' to $foo -$bar = &$foo; // Reference $foo via $bar. -$bar = "My name is $bar"; // Alter $bar... +$foo = 'Bob'; // ½« 'Bob' ¸³¸ø $foo +$bar = &$foo; // ͨ¹ý $bar ÒýÓà $foo +$bar = "My name is $bar"; // ÐÞ¸Ä $bar ±äÁ¿ echo $bar; -echo $foo; // $foo is altered too. +echo $foo; // $foo µÄÖµÒ²±»ÐÞ¸Ä ?> ]]> </programlisting> @@ -75,23 +83,23 @@ <![CDATA[ <?php $foo = 25; -$bar = &$foo; // This is a valid assignment. -$bar = &(24 * 7); // Invalid; references an unnamed expression. +$bar = &$foo; // ºÏ·¨µÄ¸³Öµ +$bar = &(24 * 7); // ·Ç·¨; ÒýÓÃûÓÐÃû×ֵıí´ïʽ function test() { return 25; } -$bar = &test(); // Invalid. +$bar = &test(); // ·Ç·¨ ?> ]]> </programlisting> </informalexample> </para> <para> - ËäÈ»ÔÚ PHP Öв¢²»ÐèÒª³õʼ»¯±äÁ¿£¬µ«ÕâÊǸöºÃÏ°¹ß¡£Î´³õʼ»¯µÄ±äÁ¿¾ßÓÐÆäÀàÐ͵ÄĬÈÏÖµ - - &false;£¬Á㣬¿Õ×Ö·û´®»òÕß¿ÕÊý×é¡£ + ËäÈ»ÔÚ PHP Öв¢²»ÐèÒª³õʼ»¯±äÁ¿£¬µ«¶Ô±äÁ¿½øÐгõʼ»¯ÊǸöºÃÏ°¹ß¡£Î´³õʼ»¯µÄ±äÁ¿¾ßÓÐÆäÀàÐ͵ÄĬÈÏÖµ - ²¼¶ûÀàÐ͵ıäÁ¿Ä¬ÈÏÖµÊÇ + &false;£¬ÕûÐκͷûµãÐͱäÁ¿Ä¬ÈÏÖµÊÇÁ㣬×Ö·û´®ÐͱäÁ¿Ä¬ÈÏÖµÊÇ¿Õ×Ö·û´®»òÕßÊý×é±äÁ¿µÄĬÈÏÖµÊÇ¿ÕÊý×é¡£ </para> <para> <example> @@ -99,10 +107,32 @@ <programlisting role="php"> <![CDATA[ <?php -echo ($unset_bool ? "true" : "false"); // false +// Unset AND unreferenced (no use context) variable; outputs NULL +var_dump($unset_var); + +// Boolean usage; outputs 'false' (See ternary operators for more on this syntax) +echo($unset_bool ? "true\n" : "false\n"); + +// String usage; outputs 'string(3) "abc"' +$unset_str .= 'abc'; +var_dump($unset_str); + +// Integer usage; outputs 'int(25)' $unset_int += 25; // 0 + 25 => 25 -echo $unset_string . "abc"; // "" . "abc" => "abc" -$unset_array[3] = "def"; // array() + array(3 => "def") => array(3 => "def") +var_dump($unset_int); + +// Float/double usage; outputs 'float(1.25)' +$unset_float += 1.25; +var_dump($unset_float); + +// Array usage; outputs array(1) { [3]=> string(3) "def" } +$unset_arr[3] = "def"; // array() + array(3 => "def") => array(3 => "def") +var_dump($unset_arr); + +// Object usage; creates new stdClass object (see http://www.php.net/manual/en/reserved.classes.php) +// Outputs: object(stdClass)#1 (1) { ["foo"]=> string(3) "bar" } +$unset_obj->foo = 'bar'; +var_dump($unset_obj); ?> ]]> </programlisting> @@ -111,8 +141,8 @@ <para> ÒÀÀµÎ´³õʼ»¯±äÁ¿µÄĬÈÏÖµÔÚijЩÇé¿öÏ»áÓÐÎÊÌ⣬ÀýÈç°ÑÒ»¸öÎļþ°üº¬µ½ÁíÒ»¸öÖ®ÖÐʱÅöÉÏÏàͬµÄ±äÁ¿Ãû¡£ÁíÍâ°Ñ <link linkend="ini.register-globals">register_globals</link> ´ò¿ªÊÇÒ»¸öÖ÷ÒªµÄ<link - linkend="security.globals">°²È«Òþ»¼</link>¡£<link linkend="errorfunc.constants.errorlevels.e-notice">E_NOTICE</link> - ¼¶±ðµÄ´íÎó»áÔÚÅöÉÏδ³õʼ»¯µÄ±äÁ¿Ê±·¢³ö£¬µ«ÊÇÔÚÏòÒ»¸öδ³õʼ»¯µÄÊý×鸽¼Óµ¥ÔªÊ±²»»á¡£<function>isset</function> + linkend="security.globals">°²È«Òþ»¼</link>¡£Ê¹ÓÃδ³õʼ»¯µÄ±äÁ¿»á·¢³ö<link + linkend="errorfunc.constants.errorlevels.e-notice">E_NOTICE</link>´íÎ󣬵«ÊÇÔÚÏòÒ»¸öδ³õʼ»¯µÄÊý×鸽¼Óµ¥ÔªÊ±²»»á¡£<function>isset</function> ÓïÑԽṹ¿ÉÒÔÓÃÀ´¼ì²âÒ»¸ö±äÁ¿ÊÇ·ñÒѱ»³õʼ»¯¡£ </para> </sect1> @@ -146,11 +176,11 @@ µÄÅäÖÃÏîÌõÄ¿£¬°²È«Ò»ÕÂÖеÄ<link linkend="security.globals">ʹÓà Register Globals</link>£¬ÒÔ¼° PHP <link xlink:href="&url.php.release4.1.0;">4.1.0</link> ºÍ - <link xlink:href="&url.php.release4.2.0;">4.2.0</link> µÄ·¢ÐÐͨ¸æ¡£ + <link xlink:href="&url.php.release4.2.0;">4.2.0</link> µÄ·¢²¼¹«¸æ¡£ </simpara> <simpara> Èç¹ûÓпÉÓÃµÄ PHP Ô¤¶¨Òå±äÁ¿ÄÇ×îºÃÓã¬Èç<link - linkend="language.variables.superglobals">³¬È«¾Ö±äÁ¿</link>¡£ + linkend="language.variables.superglobals">³¬È«¾ÖÊý×é</link>¡£ </simpara> </warning> @@ -227,8 +257,8 @@ Õâ¸ö½Å±¾²»»áÓÐÈκÎÊä³ö£¬ÒòΪ echo Óï¾äÒýÓÃÁËÒ»¸ö¾Ö²¿°æ±¾µÄ±äÁ¿ <varname>$a</varname>£¬¶øÇÒÔÚÕâ¸ö·¶Î§ÄÚ£¬Ëü²¢Ã»Óб»¸³Öµ¡£Äã¿ÉÄÜ×¢Òâµ½ PHP µÄÈ«¾Ö±äÁ¿ºÍ C ÓïÑÔÓÐÒ»µãµã²»Í¬£¬ÔÚ C - ÓïÑÔÖУ¬È«¾Ö±äÁ¿ÔÚº¯ÊýÖÐ×Ô¶¯ÉúЧ£¬³ý·Ç±»¾Ö²¿±äÁ¿¸²¸Ç¡£Õâ¿ÉÄÜÒýÆðһЩÎÊÌ⣬ÓÐЩÈË¿ÉÄÜÂþ²»¾ÐĵĸıäÒ»¸öÈ«¾Ö±äÁ¿¡£PHP - ÖÐÈ«¾Ö±äÁ¿ÔÚº¯ÊýÖÐʹÓÃʱ±ØÐëÉêÃ÷Ϊȫ¾Ö¡£ + ÓïÑÔÖУ¬È«¾Ö±äÁ¿ÔÚº¯ÊýÖÐ×Ô¶¯ÉúЧ£¬³ý·Ç±»¾Ö²¿±äÁ¿¸²¸Ç¡£Õâ¿ÉÄÜÒýÆðһЩÎÊÌ⣬ÓÐЩÈË¿ÉÄܲ»Ð¡Ðľ͸ıäÁËÒ»¸öÈ«¾Ö±äÁ¿¡£PHP + ÖÐÈ«¾Ö±äÁ¿ÔÚº¯ÊýÖÐʹÓÃʱ±ØÐëÉêÃ÷Ϊglobal¡£ </simpara> <sect2 xml:id="language.variables.scope.global"> @@ -293,8 +323,8 @@ </para> <simpara> - ÔÚ <varname>$GLOBALS</varname> - Êý×éÖУ¬Ã¿Ò»¸ö±äÁ¿ÎªÒ»¸öÔªËØ£¬¼üÃû¶ÔÓ¦±äÁ¿Ãû£¬Öµ¶ÔÓ¦±äÁ¿µÄÄÚÈÝ¡£<varname>$GLOBALS</varname> + <varname>$GLOBALS</varname> + ÊÇÒ»¸ö¹ØÁªÊý×飬ÿһ¸ö±äÁ¿ÎªÒ»¸öÔªËØ£¬¼üÃû¶ÔÓ¦±äÁ¿Ãû£¬Öµ¶ÔÓ¦±äÁ¿µÄÄÚÈÝ¡£<varname>$GLOBALS</varname> Ö®ËùÒÔÔÚÈ«¾Ö·¶Î§ÄÚ´æÔÚ£¬ÊÇÒòΪ $GLOBALS ÊÇÒ»¸ö<link linkend="language.variables.superglobals">³¬È«¾Ö±äÁ¿</link>¡£ÒÔÏ·¶ÀýÏÔʾÁ˳¬È«¾Ö±äÁ¿µÄÓô¦£º </simpara> @@ -363,7 +393,7 @@ <programlisting role="php"> <![CDATA[ <?php -function Test() +function test() { static $a = 0; echo $a; @@ -376,7 +406,7 @@ </para> <simpara> - ÏÖÔÚ£¬Ã¿´Îµ÷Óà Test() º¯Êý¶¼»áÊä³ö + ÏÖÔÚ£¬±äÁ¿<varname>$a</varname>ÔÚµÚÒ»µ÷ÓÃtest()ʱ±»³õʼ»¯£¬Ã¿´Îµ÷Óà test() º¯Êý¶¼»áÊä³ö <varname>$a</varname> µÄÖµ²¢¼ÓÒ»¡£ </simpara> @@ -392,14 +422,14 @@ <programlisting role="php"> <![CDATA[ <?php -function Test() +function test() { static $count = 0; $count++; echo $count; if ($count < 10) { - Test(); + test(); } $count--; } @@ -674,14 +704,18 @@ // ×Ô PHP 4.1.0 Æð¿ÉÓà echo $_POST['username']; echo $_REQUEST['username']; + import_request_variables('p', 'p_'); echo $p_username; -// ×Ô PHP 3 Æð¿ÉÓá£×Ô PHP 5.0.0 Æð£¬ÕâЩ½Ï³¤µÄÔ¤¶¨Òå±äÁ¿ +// PHP 6ÒÔºó½«ÎÞЧ¡£×Ô PHP 5.0.0 Æð£¬ÕâЩ½Ï³¤µÄÔ¤¶¨Òå±äÁ¿ // ¿ÉÓà register_long_arrays Ö¸Áî¹Ø±Õ¡£ + echo $HTTP_POST_VARS['username']; + // Èç¹û PHP Ö¸Áî register_globals = on ʱ¿ÉÓᣲ»¹ý×Ô // PHP 4.2.0 ÆðĬÈÏֵΪ register_globals = off¡£ // ²»ÌᳫʹÓÃ/ÒÀÀµ´ËÖÖ·½·¨¡£ + echo $username; ?> ]]> @@ -700,7 +734,7 @@ <note> <para> - <link linkend="language.variables.superglobals">³¬È«¾Ö±äÁ¿</link>ºÍ + <link linkend="language.variables.superglobals">³¬È«¾ÖÊý×é</link>ºÍ <varname>$_POST</varname> ÒÔ¼° <varname>$_GET</varname> Ò»Ñù£¬×Ô PHP 4.1.0 Æð¿ÉÓᣠ</para> @@ -710,7 +744,7 @@ ÈçÉÏËùʾ£¬ÔÚ PHP 4.2.0 ֮ǰ <link linkend="ini.register-globals">register_globals</link> µÄĬÈÏÖµÊÇ - <emphasis>on</emphasis>¡£ÔÚ PHP 3 ÖÐÆäÖµ×ÜÊÇ on¡£PHP + <emphasis>on</emphasis>¡£PHP ÉçÇø¹ÄÀø´ó¼Ò²»ÒªÒÀÀµ´ËÖ¸Á½¨ÒéÔÚ±àÂëʱ¼Ù¶¨ÆäΪ <emphasis>off</emphasis>¡£ </para> @@ -766,12 +800,7 @@ </example> </para> - <para> - ÔÚ PHP 3 ÖУ¬±äÁ¿Ê¹ÓÃÖеÄÊý×é½öÏÞÓÚһάÊý×é¡£ÔÚ - PHP 4 ÖУ¬Ã»ÓдËÖÖÏÞÖÆ¡£ - </para> - - <sect3 xml:id="language.variables.external.form.submit"> + <sect3 xml:id="language.variables.external.form.submit"> <title>IMAGE SUBMIT ±äÁ¿Ãû</title> <simpara>
http://cvs.php.net/viewvc.cgi/phpdoc-zh/language/variables.xml?r1=1.23&r2=1.24&diff_format=u Index: phpdoc-zh/language/variables.xml diff -u phpdoc-zh/language/variables.xml:1.23 phpdoc-zh/language/variables.xml:1.24 --- phpdoc-zh/language/variables.xml:1.23 Sun Dec 14 07:51:38 2008 +++ phpdoc-zh/language/variables.xml Wed Dec 17 09:00:48 2008 @@ -1,8 +1,8 @@ <?xml version="1.0" encoding="gb2312"?> -<!-- $Revision: 1.23 $ --> +<!-- $Revision: 1.24 $ --> <!-- $Author: eniac2008 $ --> -<!-- EN-Revision: 1.90 Maintainer: verdana Status: ready --> -<!-- CREDITS: dallas, Gregory --> +<!-- EN-Revision: 1.107 Maintainer: Altair Status: ready --> +<!-- CREDITS: dallas, Gregory, verdana --> <chapter xml:id="language.variables" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink"> <title>±äÁ¿</title> @@ -23,6 +23,14 @@ ÔÚ´ËËù˵µÄ×ÖĸÊÇ a-z£¬A-Z£¬ÒÔ¼° ASCII ×Ö·û´Ó 127 µ½ 255£¨0x7f-0xff£©¡£ </simpara> </note> + <note> + <simpara> + <literal>$this</literal> ÊÇÒ»¸öÌØÊâµÄ±äÁ¿£¬Ëü²»Äܱ»¸³Öµ¡£ + </simpara> + </note> + + &tip.userlandnaming; + <para> ÓйرäÁ¿µÄº¯ÊýÐÅÏ¢¼û<link linkend="ref.var">±äÁ¿º¯Êý</link>¡£ </para> @@ -45,10 +53,10 @@ </para> <para> - PHP 3 ÖУ¬±äÁ¿×ÜÊÇ´«Öµ¸³Öµ¡£ÄÇÒ²¾ÍÊÇ˵£¬µ±½«Ò»¸ö±í´ïʽµÄÖµ¸³ÓèÒ»¸ö±äÁ¿Ê±£¬Õû¸öÔʼ±í´ïʽµÄÖµ±»¸³Öµµ½Ä¿±ê±äÁ¿¡£ÕâÒâζ×Å£¬ÀýÈ磬µ±Ò»¸ö±äÁ¿µÄÖµ¸³ÓèÁíÍâÒ»¸ö±äÁ¿Ê±£¬¸Ä±äÆäÖÐÒ»¸ö±äÁ¿µÄÖµ£¬½«²»»áÓ°Ïìµ½ÁíÍâÒ»¸ö±äÁ¿¡£ÓйØÕâÖÖÀàÐ͵ĸ³Öµ²Ù×÷£¬Çë²ÎÔÄ<link linkend="language.expressions">±í´ïʽ</link>Ò»Õ¡£ + ±äÁ¿Ä¬ÈÏ×ÜÊÇ´«Öµ¸³Öµ¡£ÄÇÒ²¾ÍÊÇ˵£¬µ±½«Ò»¸ö±í´ïʽµÄÖµ¸³ÓèÒ»¸ö±äÁ¿Ê±£¬Õû¸öÔʼ±í´ïʽµÄÖµ±»¸³Öµµ½Ä¿±ê±äÁ¿¡£ÕâÒâζ×Å£¬ÀýÈ磬µ±Ò»¸ö±äÁ¿µÄÖµ¸³ÓèÁíÍâÒ»¸ö±äÁ¿Ê±£¬¸Ä±äÆäÖÐÒ»¸ö±äÁ¿µÄÖµ£¬½«²»»áÓ°Ïìµ½ÁíÍâÒ»¸ö±äÁ¿¡£ÓйØÕâÖÖÀàÐ͵ĸ³Öµ²Ù×÷£¬Çë²ÎÔÄ<link linkend="language.expressions">±í´ïʽ</link>Ò»Õ¡£ </para> <para> - PHP 4 ÌṩÁËÁíÍâÒ»ÖÖ·½Ê½¸ø±äÁ¿¸³Öµ£º<link linkend="language.references">ÒýÓø³Öµ</link>¡£ÕâÒâζ×ÅеıäÁ¿¼òµ¥µÄÒýÓ㨻»ÑÔÖ®£¬¡°³ÉΪÆä±ðÃû¡± »òÕß ¡°Ö¸Ïò¡±£©ÁËÔʼ±äÁ¿¡£¸Ä¶¯ÐµıäÁ¿½«Ó°Ïìµ½Ôʼ±äÁ¿£¬·´Ö®ÒàÈ»¡£ + PHP Ò²ÌṩÁËÁíÍâÒ»ÖÖ·½Ê½¸ø±äÁ¿¸³Öµ£º<link linkend="language.references">ÒýÓø³Öµ</link>¡£ÕâÒâζ×ÅеıäÁ¿¼òµ¥µÄÒýÓ㨻»ÑÔÖ®£¬¡°³ÉΪÆä±ðÃû¡± »òÕß ¡°Ö¸Ïò¡±£©ÁËÔʼ±äÁ¿¡£¸Ä¶¯ÐµıäÁ¿½«Ó°Ïìµ½Ôʼ±äÁ¿£¬·´Ö®ÒàÈ»¡£ </para> <para> ʹÓÃÒýÓø³Öµ£¬¼òµ¥µØ½«Ò»¸ö & @@ -57,11 +65,11 @@ <programlisting role="php"> <![CDATA[ <?php -$foo = 'Bob'; // Assign the value 'Bob' to $foo -$bar = &$foo; // Reference $foo via $bar. -$bar = "My name is $bar"; // Alter $bar... +$foo = 'Bob'; // ½« 'Bob' ¸³¸ø $foo +$bar = &$foo; // ͨ¹ý $bar ÒýÓà $foo +$bar = "My name is $bar"; // ÐÞ¸Ä $bar ±äÁ¿ echo $bar; -echo $foo; // $foo is altered too. +echo $foo; // $foo µÄÖµÒ²±»ÐÞ¸Ä ?> ]]> </programlisting> @@ -75,23 +83,23 @@ <![CDATA[ <?php $foo = 25; -$bar = &$foo; // This is a valid assignment. -$bar = &(24 * 7); // Invalid; references an unnamed expression. +$bar = &$foo; // ºÏ·¨µÄ¸³Öµ +$bar = &(24 * 7); // ·Ç·¨; ÒýÓÃûÓÐÃû×ֵıí´ïʽ function test() { return 25; } -$bar = &test(); // Invalid. +$bar = &test(); // ·Ç·¨ ?> ]]> </programlisting> </informalexample> </para> <para> - ËäÈ»ÔÚ PHP Öв¢²»ÐèÒª³õʼ»¯±äÁ¿£¬µ«ÕâÊǸöºÃÏ°¹ß¡£Î´³õʼ»¯µÄ±äÁ¿¾ßÓÐÆäÀàÐ͵ÄĬÈÏÖµ - - &false;£¬Á㣬¿Õ×Ö·û´®»òÕß¿ÕÊý×é¡£ + ËäÈ»ÔÚ PHP Öв¢²»ÐèÒª³õʼ»¯±äÁ¿£¬µ«¶Ô±äÁ¿½øÐгõʼ»¯ÊǸöºÃÏ°¹ß¡£Î´³õʼ»¯µÄ±äÁ¿¾ßÓÐÆäÀàÐ͵ÄĬÈÏÖµ - ²¼¶ûÀàÐ͵ıäÁ¿Ä¬ÈÏÖµÊÇ + &false;£¬ÕûÐκͷûµãÐͱäÁ¿Ä¬ÈÏÖµÊÇÁ㣬×Ö·û´®ÐͱäÁ¿Ä¬ÈÏÖµÊÇ¿Õ×Ö·û´®»òÕßÊý×é±äÁ¿µÄĬÈÏÖµÊÇ¿ÕÊý×é¡£ </para> <para> <example> @@ -99,10 +107,32 @@ <programlisting role="php"> <![CDATA[ <?php -echo ($unset_bool ? "true" : "false"); // false +// Unset AND unreferenced (no use context) variable; outputs NULL +var_dump($unset_var); + +// Boolean usage; outputs 'false' (See ternary operators for more on this syntax) +echo($unset_bool ? "true\n" : "false\n"); + +// String usage; outputs 'string(3) "abc"' +$unset_str .= 'abc'; +var_dump($unset_str); + +// Integer usage; outputs 'int(25)' $unset_int += 25; // 0 + 25 => 25 -echo $unset_string . "abc"; // "" . "abc" => "abc" -$unset_array[3] = "def"; // array() + array(3 => "def") => array(3 => "def") +var_dump($unset_int); + +// Float/double usage; outputs 'float(1.25)' +$unset_float += 1.25; +var_dump($unset_float); + +// Array usage; outputs array(1) { [3]=> string(3) "def" } +$unset_arr[3] = "def"; // array() + array(3 => "def") => array(3 => "def") +var_dump($unset_arr); + +// Object usage; creates new stdClass object (see http://www.php.net/manual/en/reserved.classes.php) +// Outputs: object(stdClass)#1 (1) { ["foo"]=> string(3) "bar" } +$unset_obj->foo = 'bar'; +var_dump($unset_obj); ?> ]]> </programlisting> @@ -111,8 +141,8 @@ <para> ÒÀÀµÎ´³õʼ»¯±äÁ¿µÄĬÈÏÖµÔÚijЩÇé¿öÏ»áÓÐÎÊÌ⣬ÀýÈç°ÑÒ»¸öÎļþ°üº¬µ½ÁíÒ»¸öÖ®ÖÐʱÅöÉÏÏàͬµÄ±äÁ¿Ãû¡£ÁíÍâ°Ñ <link linkend="ini.register-globals">register_globals</link> ´ò¿ªÊÇÒ»¸öÖ÷ÒªµÄ<link - linkend="security.globals">°²È«Òþ»¼</link>¡£<link linkend="errorfunc.constants.errorlevels.e-notice">E_NOTICE</link> - ¼¶±ðµÄ´íÎó»áÔÚÅöÉÏδ³õʼ»¯µÄ±äÁ¿Ê±·¢³ö£¬µ«ÊÇÔÚÏòÒ»¸öδ³õʼ»¯µÄÊý×鸽¼Óµ¥ÔªÊ±²»»á¡£<function>isset</function> + linkend="security.globals">°²È«Òþ»¼</link>¡£Ê¹ÓÃδ³õʼ»¯µÄ±äÁ¿»á·¢³ö<link + linkend="errorfunc.constants.errorlevels.e-notice">E_NOTICE</link>´íÎ󣬵«ÊÇÔÚÏòÒ»¸öδ³õʼ»¯µÄÊý×鸽¼Óµ¥ÔªÊ±²»»á¡£<function>isset</function> ÓïÑԽṹ¿ÉÒÔÓÃÀ´¼ì²âÒ»¸ö±äÁ¿ÊÇ·ñÒѱ»³õʼ»¯¡£ </para> </sect1> @@ -146,11 +176,11 @@ µÄÅäÖÃÏîÌõÄ¿£¬°²È«Ò»ÕÂÖеÄ<link linkend="security.globals">ʹÓà Register Globals</link>£¬ÒÔ¼° PHP <link xlink:href="&url.php.release4.1.0;">4.1.0</link> ºÍ - <link xlink:href="&url.php.release4.2.0;">4.2.0</link> µÄ·¢ÐÐͨ¸æ¡£ + <link xlink:href="&url.php.release4.2.0;">4.2.0</link> µÄ·¢²¼¹«¸æ¡£ </simpara> <simpara> Èç¹ûÓпÉÓÃµÄ PHP Ô¤¶¨Òå±äÁ¿ÄÇ×îºÃÓã¬Èç<link - linkend="language.variables.superglobals">³¬È«¾Ö±äÁ¿</link>¡£ + linkend="language.variables.superglobals">³¬È«¾ÖÊý×é</link>¡£ </simpara> </warning> @@ -227,8 +257,8 @@ Õâ¸ö½Å±¾²»»áÓÐÈκÎÊä³ö£¬ÒòΪ echo Óï¾äÒýÓÃÁËÒ»¸ö¾Ö²¿°æ±¾µÄ±äÁ¿ <varname>$a</varname>£¬¶øÇÒÔÚÕâ¸ö·¶Î§ÄÚ£¬Ëü²¢Ã»Óб»¸³Öµ¡£Äã¿ÉÄÜ×¢Òâµ½ PHP µÄÈ«¾Ö±äÁ¿ºÍ C ÓïÑÔÓÐÒ»µãµã²»Í¬£¬ÔÚ C - ÓïÑÔÖУ¬È«¾Ö±äÁ¿ÔÚº¯ÊýÖÐ×Ô¶¯ÉúЧ£¬³ý·Ç±»¾Ö²¿±äÁ¿¸²¸Ç¡£Õâ¿ÉÄÜÒýÆðһЩÎÊÌ⣬ÓÐЩÈË¿ÉÄÜÂþ²»¾ÐĵĸıäÒ»¸öÈ«¾Ö±äÁ¿¡£PHP - ÖÐÈ«¾Ö±äÁ¿ÔÚº¯ÊýÖÐʹÓÃʱ±ØÐëÉêÃ÷Ϊȫ¾Ö¡£ + ÓïÑÔÖУ¬È«¾Ö±äÁ¿ÔÚº¯ÊýÖÐ×Ô¶¯ÉúЧ£¬³ý·Ç±»¾Ö²¿±äÁ¿¸²¸Ç¡£Õâ¿ÉÄÜÒýÆðһЩÎÊÌ⣬ÓÐЩÈË¿ÉÄܲ»Ð¡Ðľ͸ıäÁËÒ»¸öÈ«¾Ö±äÁ¿¡£PHP + ÖÐÈ«¾Ö±äÁ¿ÔÚº¯ÊýÖÐʹÓÃʱ±ØÐëÉêÃ÷Ϊglobal¡£ </simpara> <sect2 xml:id="language.variables.scope.global"> @@ -293,8 +323,8 @@ </para> <simpara> - ÔÚ <varname>$GLOBALS</varname> - Êý×éÖУ¬Ã¿Ò»¸ö±äÁ¿ÎªÒ»¸öÔªËØ£¬¼üÃû¶ÔÓ¦±äÁ¿Ãû£¬Öµ¶ÔÓ¦±äÁ¿µÄÄÚÈÝ¡£<varname>$GLOBALS</varname> + <varname>$GLOBALS</varname> + ÊÇÒ»¸ö¹ØÁªÊý×飬ÿһ¸ö±äÁ¿ÎªÒ»¸öÔªËØ£¬¼üÃû¶ÔÓ¦±äÁ¿Ãû£¬Öµ¶ÔÓ¦±äÁ¿µÄÄÚÈÝ¡£<varname>$GLOBALS</varname> Ö®ËùÒÔÔÚÈ«¾Ö·¶Î§ÄÚ´æÔÚ£¬ÊÇÒòΪ $GLOBALS ÊÇÒ»¸ö<link linkend="language.variables.superglobals">³¬È«¾Ö±äÁ¿</link>¡£ÒÔÏ·¶ÀýÏÔʾÁ˳¬È«¾Ö±äÁ¿µÄÓô¦£º </simpara> @@ -363,7 +393,7 @@ <programlisting role="php"> <![CDATA[ <?php -function Test() +function test() { static $a = 0; echo $a; @@ -376,7 +406,7 @@ </para> <simpara> - ÏÖÔÚ£¬Ã¿´Îµ÷Óà Test() º¯Êý¶¼»áÊä³ö + ÏÖÔÚ£¬±äÁ¿<varname>$a</varname>ÔÚµÚÒ»µ÷ÓÃtest()ʱ±»³õʼ»¯£¬Ã¿´Îµ÷Óà test() º¯Êý¶¼»áÊä³ö <varname>$a</varname> µÄÖµ²¢¼ÓÒ»¡£ </simpara> @@ -392,14 +422,14 @@ <programlisting role="php"> <![CDATA[ <?php -function Test() +function test() { static $count = 0; $count++; echo $count; if ($count < 10) { - Test(); + test(); } $count--; } @@ -674,14 +704,18 @@ // ×Ô PHP 4.1.0 Æð¿ÉÓà echo $_POST['username']; echo $_REQUEST['username']; + import_request_variables('p', 'p_'); echo $p_username; -// ×Ô PHP 3 Æð¿ÉÓá£×Ô PHP 5.0.0 Æð£¬ÕâЩ½Ï³¤µÄÔ¤¶¨Òå±äÁ¿ +// PHP 6ÒÔºó½«ÎÞЧ¡£×Ô PHP 5.0.0 Æð£¬ÕâЩ½Ï³¤µÄÔ¤¶¨Òå±äÁ¿ // ¿ÉÓà register_long_arrays Ö¸Áî¹Ø±Õ¡£ + echo $HTTP_POST_VARS['username']; + // Èç¹û PHP Ö¸Áî register_globals = on ʱ¿ÉÓᣲ»¹ý×Ô // PHP 4.2.0 ÆðĬÈÏֵΪ register_globals = off¡£ // ²»ÌᳫʹÓÃ/ÒÀÀµ´ËÖÖ·½·¨¡£ + echo $username; ?> ]]> @@ -700,7 +734,7 @@ <note> <para> - <link linkend="language.variables.superglobals">³¬È«¾Ö±äÁ¿</link>ºÍ + <link linkend="language.variables.superglobals">³¬È«¾ÖÊý×é</link>ºÍ <varname>$_POST</varname> ÒÔ¼° <varname>$_GET</varname> Ò»Ñù£¬×Ô PHP 4.1.0 Æð¿ÉÓᣠ</para> @@ -710,7 +744,7 @@ ÈçÉÏËùʾ£¬ÔÚ PHP 4.2.0 ֮ǰ <link linkend="ini.register-globals">register_globals</link> µÄĬÈÏÖµÊÇ - <emphasis>on</emphasis>¡£ÔÚ PHP 3 ÖÐÆäÖµ×ÜÊÇ on¡£PHP + <emphasis>on</emphasis>¡£PHP ÉçÇø¹ÄÀø´ó¼Ò²»ÒªÒÀÀµ´ËÖ¸Á½¨ÒéÔÚ±àÂëʱ¼Ù¶¨ÆäΪ <emphasis>off</emphasis>¡£ </para> @@ -766,12 +800,7 @@ </example> </para> - <para> - ÔÚ PHP 3 ÖУ¬±äÁ¿Ê¹ÓÃÖеÄÊý×é½öÏÞÓÚһάÊý×é¡£ÔÚ - PHP 4 ÖУ¬Ã»ÓдËÖÖÏÞÖÆ¡£ - </para> - - <sect3 xml:id="language.variables.external.form.submit"> + <sect3 xml:id="language.variables.external.form.submit"> <title>IMAGE SUBMIT ±äÁ¿Ãû</title> <simpara>