<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Count the number of substring occurrences</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.substr-compare.html">substr_compare</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.substr-replace.html">substr_replace</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.substr-count" class="refentry"> <div class="refnamediv"> <h1 class="refname">substr_count</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">substr_count</span> — <span class="dc-title">Count the number of substring occurrences</span></p> </div> <div class="refsect1 description" id="refsect1-function.substr-count-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><strong>substr_count</strong></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$haystack</code></span> , <span class="methodparam"><span class="type">string</span> <code class="parameter">$needle</code></span> [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = 0</span></span> [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code></span> ]] )</div> <p class="para rdfs-comment"> <span class="function"><strong>substr_count()</strong></span> returns the number of times the <em><code class="parameter">needle</code></em> substring occurs in the <em><code class="parameter">haystack</code></em> string. Please note that <em><code class="parameter">needle</code></em> is case sensitive. </p> <blockquote class="note"><p><strong class="note">Note</strong>: <p class="para"> This function doesn't count overlapped substrings. See the example below! </p> </p></blockquote> </div> <div class="refsect1 parameters" id="refsect1-function.substr-count-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter">haystack</code></em></span> <dd> <p class="para"> The string to search in </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">needle</code></em></span> <dd> <p class="para"> The substring to search for </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">offset</code></em></span> <dd> <p class="para"> The offset where to start counting </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">length</code></em></span> <dd> <p class="para"> The maximum length after the specified offset to search for the substring. It outputs a warning if the offset plus the length is greater than the <em><code class="parameter">haystack</code></em> length. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.substr-count-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> This function returns an <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>. </p> </div> <div class="refsect1 changelog" id="refsect1-function.substr-count-changelog"> <h3 class="title">Changelog</h3> <p class="para"> <table class="doctable informaltable"> <thead> <tr> <th>Version</th> <th>Description</th> </tr> </thead> <tbody class="tbody"> <tr> <td>5.1.0</td> <td> Added the <em><code class="parameter">offset</code></em> and the <em><code class="parameter">length</code></em> parameters </td> </tr> </tbody> </table> </p> </div> <div class="refsect1 examples" id="refsect1-function.substr-count-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-4914"> <p><strong>Example #1 A <span class="function"><strong>substr_count()</strong></span> example</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$text </span><span style="color: #007700">= </span><span style="color: #DD0000">'This is a test'</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">); </span><span style="color: #FF8000">// 14<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">'is'</span><span style="color: #007700">); </span><span style="color: #FF8000">// 2<br /><br />// the string is reduced to 's is a test', so it prints 1<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">'is'</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// the text is reduced to 's i', so it prints 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">'is'</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// generates a warning because 5+10 > 14<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">'is'</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /><br /><br /></span><span style="color: #FF8000">// prints only 1, because it doesn't count overlapped substrings<br /></span><span style="color: #0000BB">$text2 </span><span style="color: #007700">= </span><span style="color: #DD0000">'gcdgcdgcd'</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text2</span><span style="color: #007700">, </span><span style="color: #DD0000">'gcdgcd'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </p> </div> <div class="refsect1 seealso" id="refsect1-function.substr-count-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"> <span class="function"><a href="function.count-chars.html" class="function" rel="rdfs-seeAlso">count_chars()</a> - Return information about characters used in a string</span></li> <li class="member"> <span class="function"><a href="function.strpos.html" class="function" rel="rdfs-seeAlso">strpos()</a> - Find the position of the first occurrence of a substring in a string</span></li> <li class="member"> <span class="function"><a href="function.substr.html" class="function" rel="rdfs-seeAlso">substr()</a> - Return part of a string</span></li> <li class="member"> <span class="function"><a href="function.strstr.html" class="function" rel="rdfs-seeAlso">strstr()</a> - Find the first occurrence of a string</span></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; 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