📄 function.grapheme-extract.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8.</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ref.intl.html">intl Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.grapheme-stripos.html">grapheme_stripos</a></div> <div class="up"><a href="ref.intl.html">intl Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.grapheme-extract" class="refentry"> <div class="refnamediv"> <h1 class="refname">grapheme_extract</h1> <p class="verinfo">(No version information available, might be only in CVS)</p><p class="refpurpose"><span class="refname">grapheme_extract</span> — <span class="dc-title">Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8.</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <p class="para">Procedural style</p> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>grapheme_extract</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$haystack</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$size</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$extract_type</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$start</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter reference">&$next</tt></span> ]]] )</div> <p class="para rdfs-comment"> Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">haystack</tt></i></span> <dd> <p class="para"> String to search. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">size</tt></i></span> <dd> <p class="para"> Maximum number items - based on the $extract_type - to return. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">extract_type</tt></i></span> <dd> <p class="para"> Defines the type of units referred to by the $size parameter: </p> <p class="para"> <ul class="simplelist"> <li class="member">GRAPHEME_EXTR_COUNT (default) - $size is the number of default grapheme clusters to extract.</li> <li class="member">GRAPHEME_EXTR_MAXBYTES - $size is the maximum number of bytes returned.</li> <li class="member">GRAPHEME_EXTR_MAXCHARS - $size is the maximum number of UTF-8 characters returned.</li> </ul> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">start</tt></i></span> <dd> <p class="para"> Starting position in $haystack in bytes - if given, it must be zero or a positive value that is less than or equal to the length of $haystack in bytes. The default is zero. If $start does not point to the first byte of a UTF-8 character, the start position is moved to the next character boundary. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">next</tt></i></span> <dd> <p class="para"> Reference to a value that will be set to the next starting position. When the call returns, this may point to the first byte position past the end of the string. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> A string starting at offset $start and ending on a default grapheme cluster boundary that conforms to the $size and $extract_type specified. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <div class="example"> <p><b>Example #1 <b>grapheme_extract()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br />$char_a_ring_nfd </span><span style="color: #007700">= </span><span style="color: #DD0000">"a\xCC\x8A"</span><span style="color: #007700">; </span><span style="color: #FF8000">// 'LATIN SMALL LETTER A WITH RING ABOVE' (U+00E5) normalization form "D"<br /></span><span style="color: #0000BB">$char_o_diaeresis_nfd </span><span style="color: #007700">= </span><span style="color: #DD0000">"o\xCC\x88"</span><span style="color: #007700">; </span><span style="color: #FF8000">// 'LATIN SMALL LETTER O WITH DIAERESIS' (U+00F6) normalization form "D"<br /><br /></span><span style="color: #007700">print </span><span style="color: #0000BB">urlencode</span><span style="color: #007700">(</span><span style="color: #0000BB">grapheme_extract</span><span style="color: #007700">( </span><span style="color: #0000BB">$char_a_ring_nfd </span><span style="color: #007700">. </span><span style="color: #0000BB">$char_o_diaeresis_nfd</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">GRAPHEME_EXTR_COUNT</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <p class="para">The above example will output:</p> <div class="example-contents"><pre><div class="cdata"><pre>o%CC%88</pre></div> </pre></div> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.grapheme-substr.html" class="function" rel="rdfs-seeAlso">grapheme_substr()</a></li> <li class="member"> <a href="http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries" class="link external">» Unicode Text Segmentation: Grapheme Cluster Boundaries </a> </li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ref.intl.html">intl Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.grapheme-stripos.html">grapheme_stripos</a></div> <div class="up"><a href="ref.intl.html">intl Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -