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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>String comparisons using a "natural order" algorithm</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.strnatcasecmp.html">strnatcasecmp</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.strncasecmp.html">strncasecmp</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.strnatcmp" class="refentry"> <div class="refnamediv"> <h1 class="refname">strnatcmp</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">strnatcmp</span> — <span class="dc-title">String comparisons using a "natural order" algorithm</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>strnatcmp</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$str1</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$str2</tt></span> )</div> <p class="para rdfs-comment"> This function implements a comparison algorithm that orders alphanumeric strings in the way a human being would, this is described as a "natural ordering". Note that this comparison is case sensitive. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">str1</tt></i></span> <dd> <p class="para"> The first string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">str2</tt></i></span> <dd> <p class="para"> The second string. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Similar to other string comparison functions, this one returns < 0 if <i><tt class="parameter">str1</tt></i> is less than <i><tt class="parameter">str2</tt></i>; > 0 if <i><tt class="parameter">str1</tt></i> is greater than <i><tt class="parameter">str2</tt></i>, and 0 if they are equal. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> An example of the difference between this algorithm and the regular computer string sorting algorithms (used in <a href="function.strcmp.html" class="function">strcmp()</a>) can be seen below: <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$arr1 </span><span style="color: #007700">= </span><span style="color: #0000BB">$arr2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"img12.png"</span><span style="color: #007700">, </span><span style="color: #DD0000">"img10.png"</span><span style="color: #007700">, </span><span style="color: #DD0000">"img2.png"</span><span style="color: #007700">, </span><span style="color: #DD0000">"img1.png"</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"Standard string comparison\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">usort</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr1</span><span style="color: #007700">, </span><span style="color: #DD0000">"strcmp"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr1</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"\nNatural order string comparison\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">usort</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr2</span><span style="color: #007700">, </span><span style="color: #DD0000">"strnatcmp"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <p class="para">The above example will output:</p> <div class="example-contents"><pre><div class="cdata"><pre>Standard string comparisonArray( [0] => img1.png [1] => img10.png [2] => img12.png [3] => img2.png)Natural order string comparisonArray( [0] => img1.png [1] => img2.png [2] => img10.png [3] => img12.png)</pre></div> </pre></div> </div> For more information see: Martin Pool's <a href="http://sourcefrog.net/projects/natsort/" class="link external">» Natural Order String Comparison</a> page. </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.preg-match.html" class="function" rel="rdfs-seeAlso">preg_match()</a></li> <li class="member"><a href="function.strcasecmp.html" class="function" rel="rdfs-seeAlso">strcasecmp()</a></li> <li class="member"><a href="function.substr.html" class="function" rel="rdfs-seeAlso">substr()</a></li> <li class="member"><a href="function.stristr.html" class="function" rel="rdfs-seeAlso">stristr()</a></li> <li class="member"><a href="function.strcmp.html" class="function" rel="rdfs-seeAlso">strcmp()</a></li> <li class="member"><a href="function.strncmp.html" class="function" rel="rdfs-seeAlso">strncmp()</a></li> <li class="member"><a href="function.strncasecmp.html" class="function" rel="rdfs-seeAlso">strncasecmp()</a></li> <li class="member"><a href="function.strnatcasecmp.html" class="function" rel="rdfs-seeAlso">strnatcasecmp()</a></li> <li class="member"><a href="function.strstr.html" class="function" rel="rdfs-seeAlso">strstr()</a></li> <li class="member"><a href="function.natsort.html" class="function" rel="rdfs-seeAlso">natsort()</a></li> <li class="member"><a href="function.natcasesort.html" class="function" rel="rdfs-seeAlso">natcasesort()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; 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