String 锟街凤拷锟斤拷

一锟斤拷锟街凤拷锟斤拷 string 锟斤拷锟斤拷锟斤拷一系锟叫碉拷锟街凤拷锟斤拷桑锟斤拷锟斤拷锟矫匡拷锟斤拷址锟斤拷锟酵拷锟揭伙拷锟斤拷纸凇锟斤拷锟斤拷锟轿讹拷锟� PHP 只锟斤拷支锟斤拷 256 锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷瞬锟街э拷锟� Unicode 锟斤拷锟斤拷锟�锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟�锟斤拷

Note: string 锟斤拷锟斤拷锟皆达到 2GB锟斤拷

锟斤法

一锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷 4 锟街凤拷式锟斤拷铮�

锟斤拷锟斤拷锟斤拷
双锟斤拷锟斤拷
heredoc 锟斤法锟结构
nowdoc 锟斤法锟结构锟斤拷锟斤拷 PHP 5.3.0 锟斤拷

锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷一锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷虻サ姆锟斤拷锟斤拷锟斤拷玫锟斤拷锟斤拷虐锟斤拷锟斤拷锟轿э拷锟斤拷锟斤拷锟斤拷址锟� '锟斤拷锟斤拷

要锟斤拷锟揭伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟角帮拷锟接革拷锟斤拷斜锟竭ｏ拷\锟斤拷锟斤拷转锟藉。要锟斤拷锟揭伙拷锟斤拷锟叫憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫憋拷撸锟�\\锟斤拷锟斤拷锟斤拷锟斤拷锟轿何凤拷式锟侥凤拷斜锟竭讹拷锟结被锟斤拷锟缴凤拷斜锟竭憋拷锟斤拷也锟斤拷锟斤拷说锟斤拷锟斤拷锟绞癸拷锟斤拷锟斤拷锟阶拷锟斤拷锟斤拷锟斤拷锟斤拷锟� \r 锟斤拷锟斤拷 \n锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟轿猴拷锟斤拷锟解含锟藉，锟酵碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷

Note: 锟斤拷锟斤拷双锟斤拷锟斤拷锟斤拷 heredoc 锟斤法锟结构锟斤拷锟节碉拷锟斤拷锟斤拷锟街凤拷锟斤拷锟叫碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷转锟斤拷锟斤拷锟叫斤拷锟斤拷锟斤拷锟斤拷锟芥换锟斤拷


<?php
echo 'this is a simple string';

// 锟斤拷锟斤拷录锟斤拷锟斤拷锟�
echo 'You can also have embedded newlines in 
strings this way as it is
okay to do';

// 锟斤拷锟斤拷锟� Arnold once said: "I'll be back"
echo 'Arnold once said: "I\'ll be back"';

// 锟斤拷锟斤拷锟� You deleted C:\*.*?
echo 'You deleted C:\\*.*?';

// 锟斤拷锟斤拷锟� You deleted C:\*.*?
echo 'You deleted C:\*.*?';

// 锟斤拷锟斤拷锟� This will not expand: \n a newline
echo 'This will not expand: \n a newline';

// 锟斤拷锟斤拷锟� Variables do not $expand $either
echo 'Variables do not $expand $either';
?>

双锟斤拷锟斤拷

锟斤拷锟斤拷址锟斤拷锟斤拷前锟轿э拷锟剿拷锟斤拷牛锟�"锟斤拷锟叫ｏ拷 PHP 锟斤拷锟斤拷一些锟斤拷锟斤拷锟斤拷址锟斤拷锟斤拷薪锟斤拷锟斤拷锟�

**转锟斤拷锟街凤拷**
锟斤拷锟斤拷	锟斤拷锟斤拷
\n	锟斤拷锟叫ｏ拷ASCII 锟街凤拷锟斤拷锟叫碉拷 LF 锟斤拷 0x0A (10)锟斤拷
\r	锟截筹拷锟斤拷ASCII 锟街凤拷锟斤拷锟叫碉拷 CR 锟斤拷 0x0D (13)锟斤拷
\t	水平锟狡憋拷锟斤拷锟紸SCII 锟街凤拷锟斤拷锟叫碉拷 HT 锟斤拷 0x09 (9)锟斤拷
\v	锟斤拷直锟狡憋拷锟斤拷锟紸SCII 锟街凤拷锟斤拷锟叫碉拷 VT 锟斤拷 0x0B (11)锟斤拷锟斤拷锟斤拷 PHP 5.2.5 锟斤拷
\e	Escape锟斤拷ASCII 锟街凤拷锟斤拷锟叫碉拷 ESC 锟斤拷 0x1B (27)锟斤拷锟斤拷锟斤拷 PHP 5.4.0 锟斤拷
\f	锟斤拷页锟斤拷ASCII 锟街凤拷锟斤拷锟叫碉拷 FF 锟斤拷 0x0C (12)锟斤拷锟斤拷锟斤拷 PHP 5.2.5 锟斤拷
\\	锟斤拷斜锟斤拷
\$	锟斤拷元锟斤拷锟�
\"	双锟斤拷锟斤拷
\[0-7]{1,3}	锟斤拷锟较革拷锟斤拷锟斤拷锟斤拷式锟斤拷锟叫碉拷锟斤拷一锟斤拷锟皆八斤拷锟狡凤拷式锟斤拷锟斤拷锟斤拷锟街凤拷
\x[0-9A-Fa-f]{1,2}	锟斤拷锟较革拷锟斤拷锟斤拷锟斤拷式锟斤拷锟叫碉拷锟斤拷一锟斤拷锟斤拷十锟斤拷锟斤拷锟狡凤拷式锟斤拷锟斤拷锟斤拷锟街凤拷

锟酵碉拷锟斤拷锟斤拷锟街凤拷锟斤拷一锟斤拷锟斤拷转锟斤拷锟轿猴拷锟斤拷锟斤拷锟街凤拷锟斤拷锟结导锟铰凤拷斜锟竭憋拷锟斤拷示锟斤拷锟斤拷锟斤拷PHP 5.1.1 锟斤拷前锟斤拷\{$var} 锟叫的凤拷斜锟竭伙拷锟斤拷锟结被锟斤拷示锟斤拷锟斤拷锟斤拷

锟斤拷双锟斤拷锟脚讹拷锟斤拷锟斤拷址锟斤拷锟斤拷锟斤拷锟揭拷锟斤拷锟斤拷锟斤拷潜锟斤拷锟斤拷岜伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

Heredoc 锟结构

锟斤拷锟斤拷锟街憋拷锟斤拷址锟斤拷锟斤拷姆锟斤拷锟斤拷锟斤拷锟� heredoc 锟戒法锟结构锟斤拷<<<锟斤拷锟节革拷锟斤拷锟斤拷锟街拷锟揭拷峁┮伙拷锟斤拷锟绞讹拷锟斤拷锟饺伙拷锟斤拷小锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷址锟斤拷锟� string 锟斤拷锟斤拷锟斤拷锟揭拷锟角帮拷娑拷锟侥憋拷识锟斤拷锟斤拷为锟斤拷锟斤拷锟斤拷志锟斤拷

锟斤拷锟斤拷时锟斤拷锟斤拷锟矫的憋拷识锟斤拷锟斤拷锟斤拷锟节革拷锟叫的碉拷一锟叫ｏ拷锟斤拷锟揭ｏ拷锟斤拷识锟斤拷锟斤拷锟斤拷锟斤拷也要锟斤拷锟斤拷锟斤拷锟斤拷签一锟斤拷锟斤拷锟斤拷 PHP 锟侥癸拷锟斤拷只锟杰帮拷锟斤拷锟斤拷母锟斤拷锟斤拷锟街猴拷锟铰伙拷锟竭ｏ拷锟斤拷锟揭憋拷锟斤拷锟斤拷锟斤拷母锟斤拷锟铰伙拷锟斤拷锟斤拷为锟斤拷头锟斤拷

Warning

要注锟斤拷锟斤拷墙锟斤拷锟斤拷锟绞讹拷锟斤拷锟斤拷谐锟斤拷锟�锟斤拷锟斤拷锟斤拷一锟斤拷锟街号ｏ拷;锟斤拷锟解，锟斤拷锟皆诧拷锟杰帮拷锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷味锟脚憋拷识锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街号碉拷前锟斤拷也锟斤拷锟斤拷锟斤拷锟轿何空白伙拷锟狡憋拷锟斤拷锟斤拷锟斤拷锟揭拷锟斤拷墙锟斤拷锟斤拷锟绞讹拷锟斤拷锟角帮拷锟斤拷锟斤拷锟角革拷锟斤拷锟斤拷锟截诧拷锟斤拷系统锟较可的伙拷锟叫ｏ拷锟斤拷锟斤拷锟斤拷 UNIX 锟斤拷 Mac OS X 系统锟斤拷锟斤拷 \n锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫革拷锟街号ｏ拷之锟斤拷也锟斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷锟斤拷小锟�

锟斤拷锟斤拷锟斤拷锟斤拷馗霉锟斤拷锟斤拷陆锟斤拷锟斤拷锟绞讹拷锟�"锟缴撅拷"锟斤拷PHP 锟斤拷锟斤拷为锟斤拷锟斤拷锟角斤拷锟斤拷锟斤拷识锟斤拷锟斤拷锟斤拷锟斤拷寻锟揭★拷锟斤拷锟斤拷锟斤拷募锟斤拷锟斤拷锟角耙裁伙拷锟斤拷业锟揭伙拷锟斤拷锟饺凤拷慕锟斤拷锟斤拷锟绞讹拷锟斤拷锟絇HP 锟斤拷锟斤拷锟斤拷锟斤拷锟揭伙拷胁锟斤拷锟揭伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟�

Heredocs 锟结构锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷始锟斤拷锟斤拷锟斤拷锟斤拷浴锟斤拷锟� PHP 5.3 锟金，达拷锟斤拷锟狡斤拷锟斤拷 heredoc 锟斤拷锟斤拷锟斤拷锟斤拷时锟斤拷效锟斤拷

Example #1 锟角凤拷锟斤拷示锟斤拷


<?php
class foo {
    public $bar = <<<EOT
bar
    EOT;
}
?>

Heredoc 锟结构锟斤拷锟斤拷锟斤拷没锟斤拷使锟斤拷双锟斤拷锟脚碉拷双锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟剿碉拷锟� heredoc 锟结构锟叫碉拷锟斤拷锟脚诧拷锟矫憋拷转锟藉，锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫筹拷锟斤拷转锟斤拷锟斤拷锟叫伙拷锟斤拷锟斤拷使锟矫★拷锟斤拷锟斤拷锟斤拷锟斤拷锟芥换锟斤拷锟斤拷锟斤拷 heredoc 锟结构锟叫猴拷锟叫革拷锟接的憋拷锟斤拷时要锟斤拷锟斤拷小锟侥★拷

Example #2 Heredoc 锟结构锟斤拷锟街凤拷锟斤拷示锟斤拷


<?php
$str = <<<EOD
Example of string
spanning multiple lines
using heredoc syntax.
EOD;

/* 锟斤拷锟叫憋拷锟斤拷锟侥革拷锟斤拷锟斤拷示锟斤拷 */
class foo
{
    var $foo;
    var $bar;

    function foo()
    {
        $this->foo = 'Foo';
        $this->bar = array('Bar1', 'Bar2', 'Bar3');
    }
}

$foo = new foo();
$name = 'MyName';

echo <<<EOT
My name is "$name". I am printing some $foo->foo.
Now, I am printing some {$foo->bar[1]}.
This should print a capital 'A': \x41
EOT;
?>

锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�

My name is "MyName". I am printing some Foo.
Now, I am printing some Bar2.
This should print a capital 'A': A

也锟斤拷锟皆帮拷 Heredoc 锟结构锟斤拷锟节猴拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟捷ｏ拷

Example #3 Heredoc 锟结构锟节诧拷锟斤拷锟叫碉拷示锟斤拷


<?php
var_dump(array(<<<EOD
foobar!
EOD
));
?>

锟斤拷 PHP 5.3.0 锟皆猴拷也锟斤拷锟斤拷锟斤拷 Heredoc 锟结构锟斤拷锟斤拷始锟斤拷锟斤拷态锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷院统锟斤拷锟斤拷锟�

Example #4 使锟斤拷 Heredoc 锟结构锟斤拷锟斤拷始锟斤拷锟斤拷态值


<?php
// 锟斤拷态锟斤拷锟斤拷
function foo()
{
    static $bar = <<<LABEL
Nothing in here...
LABEL;
}

// 锟斤拷某锟斤拷锟斤拷锟斤拷锟斤拷锟�
class foo
{
    const BAR = <<<FOOBAR
Constant example
FOOBAR;

    public $baz = <<<FOOBAR
Property example
FOOBAR;
}
?>

锟斤拷 PHP 5.3.0 锟金还匡拷锟斤拷锟斤拷 Heredoc 锟结构锟斤拷锟斤拷双锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷识锟斤拷锟斤拷

Example #5 锟斤拷 heredoc 锟结构锟斤拷使锟斤拷双锟斤拷锟斤拷


<?php
echo <<<"FOOBAR"
Hello World!
FOOBAR;
?>

Nowdoc 锟结构

锟斤拷锟斤拷 heredoc 锟结构锟斤拷锟斤拷锟斤拷双锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷Nowdoc 锟结构锟斤拷锟斤拷锟斤拷锟节碉拷锟斤拷锟斤拷锟街凤拷锟斤拷锟侥★拷Nowdoc 锟结构锟斤拷锟斤拷 heredoc 锟结构锟斤拷锟斤拷锟斤拷 nowdoc 锟斤拷锟斤拷锟斤拷锟叫斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街结构锟斤拷锟绞猴拷锟斤拷锟斤拷嵌锟斤拷 PHP 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷械锟斤拷锟斤拷锟斤拷址锟斤拷锟斤拷锟阶拷濉ｏ拷锟� SGML 锟斤拷 <![CDATA[ ]]> 锟结构锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷蔚牟锟斤拷媒锟斤拷锟斤拷锟斤拷谋锟斤拷锟斤拷疲锟絥owdoc 锟结构也锟斤拷锟斤拷同锟斤拷锟斤拷锟斤拷锟斤拷

一锟斤拷 nowdoc 锟结构也锟矫猴拷 heredocs 锟结构一锟斤拷锟侥憋拷锟� <<<锟斤拷锟斤拷锟角革拷锟节猴拷锟斤拷谋锟绞讹拷锟揭拷玫锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟� <<<'EOT'锟斤拷Heredoc 锟结构锟斤拷锟斤拷锟叫癸拷锟斤拷也同锟斤拷锟斤拷锟斤拷锟斤拷 nowdoc 锟结构锟斤拷锟斤拷锟斤拷锟角斤拷锟斤拷锟斤拷识锟斤拷锟侥癸拷锟斤拷

Example #6 Nowdoc 锟结构锟街凤拷锟斤拷示锟斤拷


<?php
$str = <<<'EOD'
Example of string
spanning multiple lines
using nowdoc syntax.
EOD;

/* 锟斤拷锟叫憋拷锟斤拷锟侥革拷锟斤拷锟接碉拷示锟斤拷 */
class foo
{
    public $foo;
    public $bar;

    function foo()
    {
        $this->foo = 'Foo';
        $this->bar = array('Bar1', 'Bar2', 'Bar3');
    }
}

$foo = new foo();
$name = 'MyName';

echo <<<'EOT'
My name is "$name". I am printing some $foo->foo.
Now, I am printing some {$foo->bar[1]}.
This should not print a capital 'A': \x41
EOT;
?>

锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�

My name is "$name". I am printing some $foo->foo.
Now, I am printing some {$foo->bar[1]}.
This should not print a capital 'A': \x41

Note:
锟斤拷锟斤拷 heredoc 锟结构锟斤拷nowdoc 锟结构锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷木锟教拷锟斤拷莼锟斤拷锟斤拷校锟斤拷锟斤拷锟酵碉拷示锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷始锟斤拷锟斤拷锟斤拷锟斤拷曰锟斤拷锟斤拷锟�

Example #7 锟斤拷态锟斤拷锟捷碉拷示锟斤拷

<?php class foo { public $bar = <<<'EOT' bar EOT; } ?>

Note:
Nowdoc 锟结构锟斤拷锟斤拷 PHP 5.3.0 锟叫硷拷锟斤拷摹锟�

锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟街凤拷锟斤拷锟斤拷双锟斤拷锟脚伙拷 heredoc 锟结构锟斤拷锟斤拷时锟斤拷锟斤拷锟叫碉拷锟斤拷锟斤拷锟斤拷锟结被锟斤拷锟斤拷锟斤拷

锟斤拷锟斤共锟斤拷锟斤拷锟斤拷锟斤法锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷锟津。简单碉拷锟斤法锟斤拷锟斤拷锟斤拷锟筋常锟矫猴拷锟筋方锟斤拷模锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷俚拇锟斤拷锟斤拷锟揭伙拷锟� string 锟斤拷嵌锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷 array 锟斤拷值锟斤拷锟斤拷一锟斤拷 object 锟斤拷锟斤拷锟皆★拷

锟斤拷锟接癸拷锟斤拷锟斤法锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷没锟斤拷锟斤拷虐锟轿э拷谋锟斤拷式锟斤拷

锟斤拷锟斤法

锟斤拷 PHP 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷元锟斤拷锟脚ｏ拷$锟斤拷时锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷芏锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷去锟斤拷暇锟斤拷锟斤拷锟侥憋拷识锟斤拷锟轿筹拷一锟斤拷锟较凤拷锟侥憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟矫伙拷锟斤拷锟斤拷锟斤拷锟斤拷确锟斤拷锟斤拷锟斤拷锟侥斤拷锟竭★拷


<?php
$juice = "apple";

echo "He drank some $juice juice.".PHP_EOL;
// Invalid. "s" is a valid character for a variable name, but the variable is $juice.
echo "He drank some juice made of $juices.";
?>

锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�

He drank some apple juice.
He drank some juice made of .

锟斤拷锟狡的ｏ拷一锟斤拷 array 锟斤拷锟斤拷锟斤拷一锟斤拷 object 锟斤拷锟斤拷也锟缴憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷要锟矫凤拷锟斤拷锟脚ｏ拷]锟斤拷锟斤拷锟斤拷示锟斤拷锟斤拷锟斤拷锟斤拷锟侥边际ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟角猴拷锟斤拷锟斤拷锟侥憋拷锟斤拷锟斤拷锟斤拷锟斤拷同锟斤拷

Example #8 锟斤拷锟斤法示锟斤拷


<?php
$juices = array("apple", "orange", "koolaid1" => "purple");

echo "He drank some $juices[0] juice.".PHP_EOL;
echo "He drank some $juices[1] juice.".PHP_EOL;
echo "He drank some juice made of $juice[0]s.".PHP_EOL; // Won't work
echo "He drank some $juices[koolaid1] juice.".PHP_EOL;

class people {
    public $john = "John Smith";
    public $jane = "Jane Smith";
    public $robert = "Robert Paulsen";
    
    public $smith = "Smith";
}

$people = new people();

echo "$people->john drank some $juices[0] juice.".PHP_EOL;
echo "$people->john then said hello to $people->jane.".PHP_EOL;
echo "$people->john's wife greeted $people->robert.".PHP_EOL;
echo "$people->robert greeted the two $people->smiths."; // Won't work
?>

锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�

He drank some apple juice.
He drank some orange juice.
He drank some juice made of s.
He drank some purple juice.
John Smith drank some apple juice.
John Smith then said hello to Jane Smith.
John Smith's wife greeted Robert Paulsen.
Robert Paulsen greeted the two .

锟斤拷锟斤拷锟揭拷锟斤拷锟斤拷锟斤拷拥慕峁癸拷锟斤拷锟斤拷酶锟斤拷锟斤拷锓拷锟�

锟斤拷锟接ｏ拷锟斤拷锟斤拷锟脚ｏ拷锟斤法

锟斤拷锟斤拷锟斤法锟斤拷锟斤拷锟斤拷为锟斤拷锟斤法锟斤拷锟接讹拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷为锟斤拷锟斤拷锟斤拷使锟矫革拷锟接的憋拷锟绞斤拷锟�

锟轿何撅拷锟斤拷 string 锟斤拷锟侥憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟介单元锟斤拷锟斤拷锟斤拷锟斤拷远锟斤拷锟绞癸拷么锟斤拷锓拷锟街伙拷锟津单碉拷锟斤拷锟斤拷 string 锟斤拷锟斤拷牡胤锟斤拷锟斤拷锟叫达拷锟斤拷锟斤拷式锟斤拷然锟斤拷锟矫伙拷锟斤拷锟斤拷 { 锟斤拷 } 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟缴★拷锟斤拷锟斤拷 { 锟睫凤拷锟斤拷转锟藉，只锟斤拷 $ 锟斤拷锟斤拷锟斤拷 { 时锟脚会被识锟金。匡拷锟斤拷锟斤拷 {\$ 锟斤拷锟斤拷锟� {$锟斤拷锟斤拷锟斤拷锟绞撅拷锟斤拷锟斤拷愿锟斤拷玫慕锟斤拷停锟�


<?php
// 锟斤拷示锟斤拷锟叫达拷锟斤拷
error_reporting(E_ALL);

$great = 'fantastic';

// 锟斤拷效锟斤拷锟斤拷锟�: This is { fantastic}
echo "This is { $great}";

// 锟斤拷效锟斤拷锟斤拷锟斤拷锟� This is fantastic
echo "This is {$great}";
echo "This is ${great}";

// 锟斤拷效
echo "This square is {$square->width}00 centimeters broad."; 

// 锟斤拷效锟斤拷只锟斤拷通锟斤拷锟斤拷锟斤拷锟斤拷锟斤法锟斤拷锟斤拷锟斤拷确锟斤拷锟斤拷锟斤拷锟斤拷锟脚的硷拷锟斤拷
echo "This works: {$arr['key']}";

// 锟斤拷效
echo "This works: {$arr[4][3]}";

// 锟斤拷锟角达拷锟斤拷谋锟斤拷式锟斤拷锟斤拷为锟斤拷锟斤拷 $foo[bar] 锟侥革拷式锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷也锟角达拷锟揭伙拷锟斤拷锟�
// 锟斤拷锟戒话说锟斤拷只锟斤拷锟斤拷 PHP 锟斤拷锟揭碉拷锟斤拷锟斤拷 foo 锟斤拷前锟斤拷锟铰才伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷
// E_NOTICE (undefined constant) 锟斤拷锟斤拷拇锟斤拷锟�
echo "This is wrong: {$arr[foo][3]}"; 

// 锟斤拷效锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷使锟矫讹拷锟斤拷锟斤拷锟斤拷时锟斤拷一锟斤拷要锟斤拷锟斤拷锟脚斤拷锟斤拷锟斤拷锟斤拷锟斤拷
echo "This works: {$arr['foo'][3]}";

// 锟斤拷效
echo "This works: " . $arr['foo'][3];

echo "This works too: {$obj->values[3]->name}";

echo "This is the value of the var named $name: {${$name}}";

echo "This is the value of the var named by the return value of getName(): {${getName()}}";

echo "This is the value of the var named by the return value of \$object->getName(): {${$object->getName()}}";

// 锟斤拷效锟斤拷锟斤拷锟斤拷锟� This is the return value of getName(): {getName()}
echo "This is the return value of getName(): {getName()}";
?>

也锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷锟矫达拷锟斤法通锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷浴锟�


<?php
class foo {
    var $bar = 'I am bar.';
}

$foo = new foo();
$bar = 'bar';
$baz = array('foo', 'bar', 'baz', 'quux');
echo "{$foo->$bar}\n";
echo "{$foo->{$baz[1]}}\n";
?>

锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�

I am bar.
I am bar.

Note:
锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷态锟斤拷锟斤拷锟斤拷锟斤拷喑ｏ拷锟街伙拷锟斤拷锟� PHP 5 锟皆猴拷趴锟斤拷锟� {$} 锟斤拷使锟矫★拷然锟斤拷锟斤拷只锟斤拷锟节革拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷占锟斤拷胁趴锟斤拷越锟斤拷锟街碉拷锟轿拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷省锟街伙拷锟揭皇癸拷没锟斤拷锟斤拷锟� ({}) 锟睫凤拷锟斤拷锟斤拷雍锟斤拷锟斤拷蚍椒锟斤拷姆锟斤拷锟街碉拷锟斤拷锟斤拷喑ｏ拷锟斤拷约锟斤拷嗑蔡拷锟斤拷锟斤拷锟街碉拷锟�


<?php
// 锟斤拷示锟斤拷锟叫达拷锟斤拷
error_reporting(E_ALL);

class beers {
    const softdrink = 'rootbeer';
    public static $ale = 'ipa';
}

$rootbeer = 'A & W';
$ipa = 'Alexander Keith\'s';

// 锟斤拷效锟斤拷锟斤拷锟斤拷锟� I'd like an A & W
echo "I'd like an {${beers::softdrink}}\n";

// 也锟斤拷效锟斤拷锟斤拷锟斤拷锟� I'd like an Alexander Keith's
echo "I'd like an {${beers::$ale}}\n";
?>

锟斤拷取锟斤拷锟睫革拷锟街凤拷锟斤拷锟叫碉拷锟街凤拷

string 锟叫碉拷锟街凤拷锟斤拷锟斤拷通锟斤拷一锟斤拷锟斤拷 0 锟斤拷始锟斤拷锟铰标，锟斤拷锟斤拷锟斤拷 array 锟结构锟叫的凤拷锟斤拷锟脚帮拷锟斤拷锟斤拷应锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟绞猴拷锟睫改ｏ拷锟斤拷锟斤拷 $str[42]锟斤拷锟斤拷锟皆帮拷 string 锟斤拷锟斤拷锟街凤拷锟斤拷傻锟� array锟斤拷锟斤拷锟斤拷 substr() 锟斤拷 substr_replace() 锟斤拷锟斤拷锟节诧拷锟斤拷锟斤拷锟斤拷一锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟�

Note: string 也锟斤拷锟矫伙拷锟斤拷锟脚凤拷锟绞ｏ拷锟斤拷锟斤拷 $str{42}锟斤拷

Warning

锟矫筹拷锟斤拷锟街凤拷锟斤拷锟斤拷锟饺碉拷锟铰憋拷写锟诫将锟斤拷锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷锟皆空革拷锟斤拷洹ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷卤锟结被转锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟角凤拷锟铰憋拷锟斤拷锟酵伙拷锟斤拷锟揭伙拷锟� E_NOTICE 锟斤拷锟斤拷锟斤拷锟斤拷酶锟斤拷锟斤拷卤锟叫达拷锟斤拷址锟斤拷锟绞憋拷锟斤拷锟斤拷一锟斤拷 E_NOTICE 锟斤拷锟斤拷锟斤拷锟斤拷酶锟斤拷锟斤拷卤锟斤拷取锟街凤拷锟斤拷时锟斤拷锟截匡拷锟街凤拷锟斤拷锟斤拷写锟斤拷时只锟矫碉拷锟剿革拷值锟街凤拷锟斤拷锟侥碉拷一锟斤拷锟街凤拷锟斤拷锟矫匡拷锟街凤拷锟斤拷锟斤拷值锟津赋革拷锟斤拷值锟斤拷 NULL 锟街凤拷锟斤拷

Warning

PHP 锟斤拷锟街凤拷锟斤拷锟斤拷锟节诧拷锟斤拷锟街斤拷锟斤拷傻锟斤拷锟斤拷椤ｏ拷锟斤拷锟矫伙拷锟斤拷锟脚凤拷锟绞伙拷锟睫革拷锟街凤拷锟斤拷锟皆讹拷锟街斤拷锟街凤拷锟斤拷锟杰诧拷锟斤拷全锟斤拷锟斤拷应锟皆碉拷锟街节憋拷锟斤拷锟斤拷锟斤拷 ISO-8859-1 锟斤拷锟街凤拷锟斤拷锟斤拷锟叫达拷锟斤拷锟斤拷锟斤拷锟�

Example #9 一些锟街凤拷锟斤拷示锟斤拷


<?php
// 取锟斤拷锟街凤拷锟斤拷锟侥碉拷一锟斤拷锟街凤拷
$str = 'This is a test.';
$first = $str[0];

// 取锟斤拷锟街凤拷锟斤拷锟侥碉拷锟斤拷锟斤拷锟街凤拷
$third = $str[2];

// 取锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷址锟�
$str = 'This is still a test.';
$last = $str[strlen($str)-1]; 

// 锟睫革拷锟街凤拷锟斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷址锟�
$str = 'Look at the sea';
$str[strlen($str)-1] = 'e';

?>

锟斤拷 PHP 5.4 锟斤拷锟街凤拷锟斤拷锟铰憋拷锟斤拷锟轿拷锟斤拷锟斤拷锟斤拷转锟斤拷为锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷岱拷锟斤拷锟斤拷妗Ｖ帮拷锟斤拷锟� "foo" 锟斤拷锟铰憋拷锟斤拷锟斤拷锟斤拷锟阶拷锟斤拷锟� 0锟斤拷

Example #10 PHP 5.3 锟斤拷 PHP 5.4 锟斤拷锟斤拷锟斤拷


<?php
$str = 'abc';

var_dump($str['1']);
var_dump(isset($str['1']));

var_dump($str['1.0']);
var_dump(isset($str['1.0']));

var_dump($str['x']);
var_dump(isset($str['x']));

var_dump($str['1x']);
var_dump(isset($str['1x']));
?>

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷PHP 5.3锟叫碉拷锟斤拷锟斤拷锟�

string(1) "b"
bool(true)
string(1) "b"
bool(true)
string(1) "a"
bool(true)
string(1) "b"
bool(true)

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷PHP 5.4锟叫碉拷锟斤拷锟斤拷锟�

string(1) "b"
bool(true)

Warning: Illegal string offset '1.0' in /tmp/t.php on line 7
string(1) "b"
bool(false)

Warning: Illegal string offset 'x' in /tmp/t.php on line 9
string(1) "a"
bool(false)
string(1) "b"
bool(false)

Note:
锟斤拷 [] 锟斤拷 {} 锟斤拷锟斤拷锟轿猴拷锟斤拷锟斤拷锟斤拷锟酵ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷应锟接口的讹拷锟斤拷实锟街ｏ拷锟侥憋拷锟斤拷只锟斤拷锟斤拷锟斤拷锟截凤拷锟斤拷 NULL锟斤拷

Note:
PHP 5.5 锟斤拷锟斤拷锟斤拷直锟斤拷锟斤拷锟街凤拷锟斤拷原锟斤拷锟斤拷锟斤拷 [] 锟斤拷 {} 锟斤拷锟斤拷锟街凤拷锟斤拷支锟街★拷

锟斤拷锟矫的猴拷锟斤拷锟斤拷锟斤拷锟斤拷锟�

锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷 '.'锟斤拷锟姐）锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟阶拷锟� '+'锟斤拷锟接号ｏ拷锟斤拷锟斤拷锟�没锟斤拷锟斤拷锟斤拷锟斤拷堋锟斤拷锟斤拷锟斤拷锟较拷慰锟�锟街凤拷锟斤拷锟斤拷锟斤拷锟�锟斤拷

锟斤拷锟斤拷 string 锟侥诧拷锟斤拷锟叫很讹拷锟斤拷锟矫的猴拷锟斤拷锟斤拷

锟斤拷锟皆参匡拷锟街凤拷锟斤拷锟斤拷锟斤拷锟剿斤拷蟛糠趾锟斤拷锟斤拷锟斤拷呒锟斤拷牟锟斤拷锟斤拷锟斤拷婊伙拷锟斤拷芸锟斤拷圆慰锟�锟斤拷锟斤拷锟斤拷式锟斤拷锟斤拷锟斤拷 Perl 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷式锟斤拷锟斤拷锟斤拷

锟斤拷锟解还锟斤拷 URL 锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷也锟叫硷拷锟杰ｏ拷锟斤拷锟斤拷锟街凤拷锟斤拷锟侥猴拷锟斤拷锟斤拷mcrypt 锟斤拷 mhash锟斤拷锟斤拷

锟斤拷螅锟斤拷圆慰锟�锟街凤拷锟斤拷锟酵猴拷锟斤拷锟斤拷

转锟斤拷锟斤拷锟街凤拷锟斤拷

一锟斤拷值锟斤拷锟斤拷通锟斤拷锟斤拷锟斤拷前锟斤拷锟斤拷锟� (string) 锟斤拷锟斤拷 strval() 锟斤拷锟斤拷锟斤拷转锟斤拷锟斤拷址锟斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷锟揭拷址锟斤拷锟斤拷谋锟斤拷式锟叫ｏ拷锟斤拷锟皆讹拷转锟斤拷为 string锟斤拷锟斤拷锟斤拷锟斤拷使锟矫猴拷锟斤拷 echo 锟斤拷 print 时锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷 string 锟斤拷锟叫比斤拷时锟斤拷锟酵会发锟斤拷锟斤拷锟斤拷转锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷转锟斤拷锟斤拷锟皆革拷锟矫的斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷椋诧拷刹慰锟斤拷锟斤拷锟� settype()锟斤拷

一锟斤拷锟斤拷锟斤拷值 boolean 锟斤拷 TRUE 锟斤拷转锟斤拷锟斤拷 string 锟斤拷 "1"锟斤拷Boolean 锟斤拷 FALSE 锟斤拷转锟斤拷锟斤拷 ""锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷转锟斤拷锟斤拷锟斤拷锟斤拷 boolean 锟斤拷 string 之锟斤拷锟洁互锟斤拷锟叫★拷

一锟斤拷锟斤拷锟斤拷 integer 锟津浮碉拷锟斤拷 float 锟斤拷转锟斤拷为锟斤拷锟街碉拷锟斤拷锟斤拷锟斤拷式锟斤拷 string锟斤拷锟斤拷锟斤拷 float 锟叫碉拷指锟斤拷锟斤拷锟街ｏ拷锟斤拷使锟斤拷指锟斤拷锟斤拷锟斤拷锟斤拷锟侥革拷锟斤拷锟斤拷锟斤拷4.1E+6锟斤拷也锟斤拷转锟斤拷锟斤拷

Note:
锟节脚憋拷锟斤拷锟斤拷锟斤拷category LC_NUMERIC锟斤拷锟叫讹拷锟斤拷锟斤拷十锟斤拷锟斤拷小锟斤拷锟斤拷锟街凤拷锟斤拷锟轿硷拷 setlocale()锟斤拷

锟斤拷锟斤拷 array 锟斤拷锟斤拷转锟斤拷锟斤拷锟街凤拷锟斤拷 "Array"锟斤拷锟斤拷耍锟�echo 锟斤拷 print 锟睫凤拷锟斤拷示锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟捷★拷要锟斤拷示某锟斤拷锟斤拷元锟斤拷锟斤拷锟斤拷锟斤拷 echo $arr['foo'] 锟斤拷锟街结构锟斤拷要锟斤拷示锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟捷硷拷锟斤拷锟侥★拷

锟斤拷 PHP 4 锟叫讹拷锟斤拷 object 锟斤拷锟角憋拷转锟斤拷锟斤拷锟街凤拷锟斤拷 "Object"锟斤拷锟斤拷锟轿拷说锟斤拷锟皆拷锟斤拷锟揭拷锟接★拷锟斤拷锟斤拷锟斤拷值锟斤拷锟斤拷锟斤拷锟斤拷亩锟斤拷锟斤拷摹锟轿拷说玫锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷疲锟斤拷锟斤拷锟斤拷锟� get_class() 锟斤拷锟斤拷锟斤拷锟斤拷 PHP 5 锟斤拷锟绞碉拷时锟斤拷锟斤拷锟斤拷 __toString 锟斤拷锟斤拷锟斤拷

锟斤拷源 resource 锟杰会被转锟斤拷锟� "Resource id #1" 锟斤拷锟街结构锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟叫碉拷 1 锟斤拷 PHP 锟斤拷锟斤拷锟斤拷时锟斤拷锟斤拷锟斤拷锟� resource 锟斤拷唯一值锟斤拷锟斤拷要锟斤拷锟斤拷锟剿结构锟斤拷锟斤拷锟杰伙拷锟叫憋拷锟斤拷锟揭拷玫锟揭伙拷锟� resource 锟斤拷锟斤拷锟酵ｏ拷锟斤拷锟斤拷锟矫猴拷锟斤拷 get_resource_type()锟斤拷

NULL 锟斤拷锟角憋拷转锟斤拷煽锟斤拷址锟斤拷锟斤拷锟�

锟斤拷锟斤拷锟斤拷锟斤拷说锟侥ｏ拷直锟接帮拷 array锟斤拷object 锟斤拷 resource 转锟斤拷锟斤拷 string 锟斤拷锟斤拷玫锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街拷锟斤拷锟轿猴拷锟斤拷锟斤拷锟斤拷息锟斤拷锟斤拷锟斤拷使锟矫猴拷锟斤拷 print_r() 锟斤拷 var_dump() 锟叫筹拷锟斤拷些锟斤拷锟酵碉拷锟斤拷锟捷★拷

锟襟部分碉拷 PHP 值锟斤拷锟斤拷转锟斤拷锟� string 锟斤拷锟斤拷锟矫憋拷锟芥，锟解被锟斤拷锟斤拷锟斤拷锟叫伙拷锟斤拷锟斤拷锟斤拷锟矫猴拷锟斤拷 serialize() 锟斤拷实锟街★拷锟斤拷锟� PHP 锟斤拷锟斤拷锟借定支锟斤拷 WDDX锟斤拷PHP 值也锟缴憋拷锟斤拷锟叫伙拷为锟斤拷式锟斤拷锟矫碉拷 XML 锟侥憋拷锟斤拷

锟街凤拷锟斤拷转锟斤拷为锟斤拷值

锟斤拷一锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷值锟斤拷取值锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟铰ｏ拷

锟斤拷锟斤拷锟斤拷址锟斤拷锟矫伙拷邪锟斤拷锟� '.'锟斤拷'e' 锟斤拷 'E' 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷值锟斤拷锟斤拷锟酵的凤拷围之锟节ｏ拷锟斤拷 PHP_INT_MAX 锟斤拷锟斤拷锟藉）锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 integer 锟斤拷取值锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷露锟斤拷锟斤拷锟轿� float 锟斤拷取值锟斤拷

锟斤拷锟街凤拷锟斤拷锟侥匡拷始锟斤拷锟街撅拷锟斤拷锟斤拷锟斤拷锟斤拷值锟斤拷锟斤拷锟斤拷锟斤拷址锟斤拷锟斤拷院戏锟斤拷锟斤拷锟街碉拷锟绞硷拷锟斤拷锟绞癸拷酶锟斤拷锟街碉拷锟斤拷锟斤拷锟斤拷锟街滴� 0锟斤拷锟姐）锟斤拷锟较凤拷锟斤拷值锟缴匡拷选锟斤拷锟斤拷锟斤拷锟脚ｏ拷锟斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷锟斤拷锟斤拷锟斤拷郑锟斤拷锟斤拷锟斤拷锟叫★拷锟斤拷悖╋拷锟斤拷俑锟斤拷趴锟窖★拷锟街革拷锟斤拷锟斤拷帧锟街革拷锟斤拷锟斤拷锟斤拷锟� 'e' 锟斤拷 'E' 锟斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷锟斤拷锟斤拷锟斤拷止锟斤拷伞锟�


<?php
$foo = 1 + "10.5";                // $foo is float (11.5)
$foo = 1 + "-1.3e3";              // $foo is float (-1299)
$foo = 1 + "bob-1.3e3";           // $foo is integer (1)
$foo = 1 + "bob3";                // $foo is integer (1)
$foo = 1 + "10 Small Pigs";       // $foo is integer (11)
$foo = 4 + "10.2 Little Piggies"; // $foo is float (14.2)
$foo = "10.0 pigs " + 1;          // $foo is float (11)
$foo = "10.0 pigs " + 1.0;        // $foo is float (11)     
?>

锟斤拷锟斤拷锟斤拷息锟斤拷锟皆参匡拷 Unix 锟街诧拷锟叫碉拷 strtod(3)锟斤拷

锟斤拷锟斤拷锟叫碉拷示锟斤拷锟斤拷锟斤拷通锟斤拷锟斤拷锟狡ｏ拷粘锟斤拷锟斤拷锟斤拷锟斤拷拇锟斤拷锟斤拷锟斤拷锟斤拷锟绞撅拷锟�


<?php
echo "\$foo==$foo; type is " . gettype ($foo) . "<br />\n";
?>

锟斤拷要锟斤拷锟斤拷锟斤拷 C 锟斤拷锟斤拷锟叫碉拷锟斤拷锟斤拷锟斤拷通锟斤拷锟斤拷一锟斤拷锟街凤拷转锟斤拷锟斤拷锟斤拷锟斤拷锟皆得碉拷锟斤拷锟斤拷搿Ｊ癸拷煤锟斤拷锟� ord() 锟斤拷 chr() 实锟斤拷 ASCII 锟斤拷锟斤拷址锟斤拷锟斤拷转锟斤拷锟斤拷

锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟�

PHP 锟叫碉拷 string 锟斤拷实锟街凤拷式锟斤拷一锟斤拷锟斤拷锟街斤拷锟斤拷傻锟斤拷锟斤拷锟斤拷偌锟斤拷锟揭伙拷锟斤拷锟斤拷锟街革拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷取锟斤拷锟斤拷锟斤拷锟轿斤拷锟街斤拷转锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷息锟斤拷锟缴筹拷锟斤拷员锟斤拷锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷什么值锟斤拷锟斤拷刹锟斤拷锟斤拷锟斤拷疲锟斤拷乇锟侥ｏ拷锟斤拷值为 0锟斤拷"NUL bytes"锟斤拷锟斤拷锟街节匡拷锟皆达拷锟斤拷锟街凤拷锟斤拷锟轿猴拷位锟矫ｏ拷锟斤拷锟斤拷锟叫硷拷锟斤拷锟斤拷锟斤拷锟斤拷锟节憋拷锟街诧拷锟叫憋拷锟斤拷为锟斤拷"锟斤拷锟斤拷锟狡帮拷全"锟侥ｏ拷也锟斤拷锟斤拷 NUL 锟街斤拷之锟斤拷锟斤拷锟斤拷锟饺拷锟斤拷锟斤拷裕锟斤拷锟�

锟街凤拷锟斤拷锟斤拷锟酵的达拷锟斤拷锟皆斤拷锟斤拷锟斤拷为什么 PHP 锟斤拷没锟叫碉拷锟斤拷锟斤拷"byte"锟斤拷锟斤拷 - 锟窖撅拷锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟剿★拷锟斤拷锟截凤拷锟侥憋拷值锟侥猴拷锟斤拷 - 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷捉锟斤拷侄锟饺★拷锟斤拷锟斤拷锟斤拷锟斤拷锟� - 锟皆会返锟斤拷锟街凤拷锟斤拷锟斤拷

锟斤拷锟斤拷 PHP 锟斤拷锟斤拷锟截憋拷指锟斤拷锟街凤拷锟斤拷锟侥憋拷锟诫，锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷兀锟斤拷锟斤拷锟斤拷址锟斤拷锟� "锟斤拷" 锟斤拷锟斤拷锟角碉拷锟斤拷 "\xE1"锟斤拷ISO-8859-1锟斤拷锟斤拷"\xC3\xA1"锟斤拷UTF-8锟斤拷C form锟斤拷锟斤拷"\x61\xCC\x81"锟斤拷UTF-8锟斤拷D form锟斤拷锟斤拷锟斤拷锟轿猴拷锟斤拷锟斤拷锟斤拷锟杰的憋拷锟斤拷兀锟斤拷锟斤拷锟斤拷址锟斤拷锟斤拷岜伙拷锟斤拷崭媒疟锟斤拷募锟斤拷锟酵拷谋锟斤拷敕绞斤拷锟斤拷锟斤拷搿ｏ拷锟斤拷锟斤拷锟揭伙拷锟斤拷疟锟斤拷谋锟斤拷锟斤拷锟� ISO-8859-1锟斤拷锟斤拷锟斤拷锟叫碉拷锟街凤拷锟斤拷也锟结被锟斤拷锟斤拷为 ISO-8859-1锟斤拷锟皆达拷锟斤拷锟狡★拷锟斤拷锟斤拷锟解并锟斤拷锟斤拷锟斤拷锟节硷拷锟斤拷锟斤拷 Zend Multibyte 时锟斤拷锟斤拷时锟脚憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟轿何凤拷式锟斤拷锟斤拷模锟斤拷锟饺分革拷锟斤拷锟斤拷远锟斤拷锟解）然锟斤拷转锟斤拷为某锟斤拷锟节诧拷锟斤拷锟诫，然锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟矫此凤拷式锟斤拷锟诫。注锟斤拷疟锟斤拷谋锟斤拷锟斤拷锟揭恍┰硷拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 Zend Multibyte 锟斤拷锟斤拷锟斤拷锟节诧拷锟斤拷锟诫）- 锟斤拷锟斤拷味锟脚此憋拷锟斤拷应锟斤拷锟斤拷 ASCII 锟侥硷拷锟捷筹拷锟斤拷锟斤拷锟斤拷锟斤拷 UTF-8 锟斤拷 ISO-8859-1锟斤拷锟斤拷锟斤拷要注锟解，锟斤拷锟斤拷状态锟侥憋拷锟斤拷锟斤拷锟斤拷锟斤拷同锟斤拷锟街斤拷值锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷母锟酵凤拷锟斤拷锟斤拷母锟斤拷转锟斤拷状态锟斤拷锟斤拷锟斤拷芑锟斤拷锟斤拷锟斤拷锟解。

锟斤拷然锟剿ｏ拷要锟斤拷锟斤拷锟斤拷锟矫ｏ拷锟斤拷锟斤拷锟侥憋拷锟侥猴拷锟斤拷锟斤拷锟斤拷俣锟斤拷址锟斤拷锟斤拷锟斤拷锟轿憋拷锟斤拷摹锟斤拷锟斤拷业锟斤拷牵锟絇HP 锟斤拷锟节此的猴拷锟斤拷锟叫很讹拷锟斤拷郑锟�

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