Source of: /manual/en/function.xdiff-string-diff.php
<?php
include_once $_SERVER['DOCUMENT_ROOT'] . '/include/shared-manual.inc';
$TOC = array();
$PARENTS = array();
include_once dirname(__FILE__) ."/toc/ref.xdiff.inc";
$setup = array (
'home' =>
array (
0 => 'index.php',
1 => 'PHP Manual',
),
'head' =>
array (
0 => 'UTF-8',
1 => 'en',
),
'this' =>
array (
0 => 'function.xdiff-string-diff.php',
1 => 'xdiff_string_diff',
),
'up' =>
array (
0 => 'ref.xdiff.php',
1 => 'xdiff Functions',
),
'prev' =>
array (
0 => 'function.xdiff-string-diff-binary.php',
1 => 'xdiff_string_diff_binary',
),
'next' =>
array (
0 => 'function.xdiff-string-merge3.php',
1 => 'xdiff_string_merge3',
),
);
$setup["toc"] = $TOC;
$setup["parents"] = $PARENTS;
manual_setup($setup);
manual_header();
?>
<div id="function.xdiff-string-diff" class="refentry">
<div class="refnamediv">
<h1 class="refname">xdiff_string_diff</h1>
<p class="verinfo">(PECL xdiff >= 0.2.0)</p><p class="refpurpose"><span class="refname">xdiff_string_diff</span> — <span class="dc-title">Make unified diff of two strings</span></p>
</div>
<a name="function.xdiff-string-diff.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">string</span> <span class="methodname"><b>xdiff_string_diff</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">$context</tt><span class="initializer"> = 3</span></span>
[, <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$minimal</tt><span class="initializer"> = false</span></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>
<a name="function.xdiff-string-diff.parameters"></a><div class="refsect1 parameters">
<h3 class="title">Parameters</h3>
<p class="para">
</p><dl>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">old_data</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
First string with data. It acts as "old" data.
</p>
</dd>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">new_data</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
Second string with data. It acts as "new" data.
</p>
</dd>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">context</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
Indicates how many lines of context you want to include in the diff
result. Default is 3.
</p>
</dd>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">minimal</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
Set this parameter to <b><tt class="constant">TRUE</tt></b> if you want to minimalize the size of the
result (can take a long time).
</p>
</dd>
</dl>
<p>
</p>
</div>
<a name="function.xdiff-string-diff.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns string with resulting diff or <b><tt class="constant">FALSE</tt></b> if an internal error happened.
</p>
</div>
<a name="function.xdiff-string-diff.examples"></a><div class="refsect1 examples">
<h3 class="title">Examples</h3>
<p class="para">
</p><div class="example">
<p><b>Example #1 <b>xdiff_string_diff()</b> example</b></p>
<div class="example-contents para"><p>
The following code makes unified diff of two articles.
</p></div>
<div class="example-contents programlisting">
<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>
</p>
</div>
<a name="function.xdiff-string-diff.notes"></a><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.php" class="function">xdiff_string_bdiff()</a>/<a href="function.xdiff-string-rabdiff.php" class="function">xdiff_string_rabdiff()</a>.
<br />
</p></blockquote>
</div>
<a name="function.xdiff-string-diff.seealso"></a><div class="refsect1 seealso">
<h3 class="title">See Also</h3>
<p class="para">
</p><ul class="simplelist">
<li class="member"><a href="function.xdiff-string-patch.php" class="function" rel="rdfs-seeAlso">xdiff_string_patch()</a> - Patch a string with an unified diff</li>
</ul><p>
</p>
</div>
</div><?php manual_footer(); ?>
