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php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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><H1
><A
NAME="function.trim"
></A
>trim</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN228670"
></A
><P
>    (PHP 3, PHP 4, PHP 5)</P
>trim&nbsp;--&nbsp;Strip whitespace (or other characters) from the beginning and end of a string</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228673"
></A
><H2
>说明</H2
>string <B
CLASS="methodname"
>trim</B
> ( string str [, string charlist] )<BR
></BR
><P
>&#13;   This function returns a string with whitespace stripped from the
   beginning and end of <CODE
CLASS="parameter"
>str</CODE
>.
   Without the second parameter,
   <B
CLASS="function"
>trim()</B
> will strip these characters:
   
   <P
></P
><UL
><LI
><P
>&#13;      " " (<ACRONYM
CLASS="acronym"
>ASCII</ACRONYM
> <TT
CLASS="literal"
>32</TT
> 
      (<TT
CLASS="literal"
>0x20</TT
>)), an ordinary space.
     </P
></LI
><LI
><P
>&#13;      "\t" (<ACRONYM
CLASS="acronym"
>ASCII</ACRONYM
> <TT
CLASS="literal"
>9</TT
> 
      (<TT
CLASS="literal"
>0x09</TT
>)), a tab.
     </P
></LI
><LI
><P
>&#13;      "\n" (<ACRONYM
CLASS="acronym"
>ASCII</ACRONYM
> <TT
CLASS="literal"
>10</TT
> 
      (<TT
CLASS="literal"
>0x0A</TT
>)), a new line (line feed).
     </P
></LI
><LI
><P
>&#13;      "\r" (<ACRONYM
CLASS="acronym"
>ASCII</ACRONYM
> <TT
CLASS="literal"
>13</TT
> 
      (<TT
CLASS="literal"
>0x0D</TT
>)), a carriage return.
     </P
></LI
><LI
><P
>&#13;      "\0" (<ACRONYM
CLASS="acronym"
>ASCII</ACRONYM
> <TT
CLASS="literal"
>0</TT
> 
      (<TT
CLASS="literal"
>0x00</TT
>)), the <TT
CLASS="literal"
>NUL</TT
>-byte.
     </P
></LI
><LI
><P
> 
      "\x0B" (<ACRONYM
CLASS="acronym"
>ASCII</ACRONYM
> <TT
CLASS="literal"
>11</TT
> 
      (<TT
CLASS="literal"
>0x0B</TT
>)), a vertical tab.
     </P
></LI
></UL
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228719"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>str</CODE
></DT
><DD
><P
>&#13;       The <A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
> that will be trimmed.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>charlist</CODE
></DT
><DD
><P
>&#13;       Optionally, the stripped characters can also be specified using
       the <CODE
CLASS="parameter"
>charlist</CODE
> parameter.
       Simply list all characters that you want to be stripped. With
       <TT
CLASS="literal"
>..</TT
> you can specify a range of characters.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228736"
></A
><H2
>返回值</H2
><P
>&#13;   The trimmed string.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228739"
></A
><H2
>更新日志</H2
><P
>&#13;   <DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN228742"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>版本</TH
><TH
>说明</TH
></TR
></THEAD
><TBODY
><TR
><TD
>4.1.0</TD
><TD
>&#13;        The optional <CODE
CLASS="parameter"
>charlist</CODE
> parameter was added.
       </TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228753"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN228756"
></A
><P
><B
>例 1. Usage example of <B
CLASS="function"
>trim()</B
></B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />$text&nbsp;&nbsp;&nbsp;</font><font color="#007700">= </font><font color="#DD0000">"\t\tThese are a few words :) ...&nbsp;&nbsp;"</font><font color="#007700">;<br /></font><font color="#0000BB">$binary </font><font color="#007700">= </font><font color="#DD0000">"\x09Example string\x0A"</font><font color="#007700">;<br /></font><font color="#0000BB">$hello&nbsp;&nbsp;</font><font color="#007700">= </font><font color="#DD0000">"Hello World"</font><font color="#007700">;<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$text</font><font color="#007700">, </font><font color="#0000BB">$binary</font><font color="#007700">, </font><font color="#0000BB">$hello</font><font color="#007700">);<br /><br />print </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /><br /></font><font color="#0000BB">$trimmed </font><font color="#007700">= </font><font color="#0000BB">trim</font><font color="#007700">(</font><font color="#0000BB">$text</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$trimmed</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$trimmed </font><font color="#007700">= </font><font color="#0000BB">trim</font><font color="#007700">(</font><font color="#0000BB">$text</font><font color="#007700">, </font><font color="#DD0000">" \t."</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$trimmed</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$trimmed </font><font color="#007700">= </font><font color="#0000BB">trim</font><font color="#007700">(</font><font color="#0000BB">$hello</font><font color="#007700">, </font><font color="#DD0000">"Hdle"</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$trimmed</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// trim the ASCII control characters at the beginning and end of $binary<br />// (from 0 to 31 inclusive)<br /></font><font color="#0000BB">$clean </font><font color="#007700">= </font><font color="#0000BB">trim</font><font color="#007700">(</font><font color="#0000BB">$binary</font><font color="#007700">, </font><font color="#DD0000">"\x00..\x1F"</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$clean</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>string(32) "        These are a few words :) ...  "
string(16) "    Example string
"
string(11) "Hello World"

string(28) "These are a few words :) ..."
string(24) "These are a few words :)"
string(5) "o Wor"
string(14) "Example string"</PRE
></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="AEN228763"
></A
><P
><B
>例 2. Trimming array values with <B
CLASS="function"
>trim()</B
></B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">function </font><font color="#0000BB">trim_value</font><font color="#007700">(&amp;</font><font color="#0000BB">$value</font><font color="#007700">) <br />{ <br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$value </font><font color="#007700">= </font><font color="#0000BB">trim</font><font color="#007700">(</font><font color="#0000BB">$value</font><font color="#007700">); <br />}<br /><br /></font><font color="#0000BB">$fruit </font><font color="#007700">= array(</font><font color="#DD0000">'apple'</font><font color="#007700">,</font><font color="#DD0000">'banana '</font><font color="#007700">, </font><font color="#DD0000">' cranberry '</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$fruit</font><font color="#007700">);<br /><br /></font><font color="#0000BB">array_walk</font><font color="#007700">(</font><font color="#0000BB">$fruit</font><font color="#007700">, </font><font color="#DD0000">'trim_value'</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$fruit</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>array(3) {
  [0]=&#62;
  string(5) "apple"
  [1]=&#62;
  string(7) "banana "
  [2]=&#62;
  string(11) " cranberry "
}
array(3) {
  [0]=&#62;
  string(5) "apple"
  [1]=&#62;
  string(6) "banana"
  [2]=&#62;
  string(9) "cranberry"
}</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN228769"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.ltrim.html"
><B
CLASS="function"
>ltrim()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.rtrim.html"
><B
CLASS="function"
>rtrim()</B
></A
></TD
></TR
></TBODY
></TABLE
><P
></P
>
  </P
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