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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Make unified diff of two strings</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="function.xdiff-string-diff-binary.html">xdiff_string_diff_binary</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.xdiff-string-merge3.html">xdiff_string_merge3</a></div> <div class="up"><a href="ref.xdiff.html">xdiff Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.xdiff-string-diff" class="refentry"> <div class="refnamediv"> <h1 class="refname">xdiff_string_diff</h1> <p class="verinfo">(PECL xdiff:0.2-1.4)</p><p class="refpurpose"><span class="refname">xdiff_string_diff</span> — <span class="dc-title">Make unified diff of two strings</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>xdiff_string_diff</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$old_data</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$new_data</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$context</tt></span> [, <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$minimal</tt></span> ]] )</div> <p class="para rdfs-comment"> Makes an unified diff containing differences between <i><tt class="parameter">old_data</tt></i> string and <i><tt class="parameter">new_data</tt></i> string and returns it. The resulting diff is human-readable. An optional <i><tt class="parameter">context</tt></i> parameter specifies how many lines of context should be added around each change (with default value of 3). Setting <i><tt class="parameter">minimal</tt></i> parameter to true will result in outputting the shortest patch file possible (can take a long time). </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">old_data</tt></i></span> <dd> <p class="para"> First string with data. It acts as "old" data. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">new_data</tt></i></span> <dd> <p class="para"> Second string with data. It acts as "new" data. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">context</tt></i></span> <dd> <p class="para"> Indicates how many lines of context you want to include in the diff result. Default is 3. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">minimal</tt></i></span> <dd> <p class="para"> Set this parameter to <b><tt>TRUE</tt></b> if you want to minimalize the size of the result (can take a long time). </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns string with resulting diff or <b><tt>FALSE</tt></b> if an internal error happened. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>xdiff_string_diff()</b> example</b></p> <div class="example-contents"><p> The following code makes unified diff of two articles. </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$old_article </span><span style="color: #007700">= </span><span style="color: #0000BB">file_get_contents</span><span style="color: #007700">(</span><span style="color: #DD0000">'./old_article.txt'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$new_article </span><span style="color: #007700">= </span><span style="color: #0000BB">$_REQUEST</span><span style="color: #007700">[</span><span style="color: #DD0000">'article'</span><span style="color: #007700">]; </span><span style="color: #FF8000">/* Let's say that someone pasted a new article to html form */<br /><br /></span><span style="color: #0000BB">$diff </span><span style="color: #007700">= </span><span style="color: #0000BB">xdiff_string_diff</span><span style="color: #007700">(</span><span style="color: #0000BB">$old_article</span><span style="color: #007700">, </span><span style="color: #0000BB">$new_article</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">is_string</span><span style="color: #007700">(</span><span style="color: #0000BB">$diff</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Differences between two articles:\n"</span><span style="color: #007700">;<br /> echo </span><span style="color: #0000BB">$diff</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: This function doesn't work well with binary strings. To make diff of binary strings use <a href="function.xdiff-string-bdiff.html" class="function">xdiff_string_bdiff()</a>/<a href="function.xdiff-string-rabdiff.html" class="function">xdiff_string_rabdiff()</a>. <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.xdiff-string-patch.html" class="function" rel="rdfs-seeAlso">xdiff_string_patch()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.xdiff-string-diff-binary.html">xdiff_string_diff_binary</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.xdiff-string-merge3.html">xdiff_string_merge3</a></div> <div class="up"><a href="ref.xdiff.html">xdiff Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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