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<title>Count the number of substring occurrences</title>
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<h1 class="refname">substr_count</h1>
<p class="verinfo">(PHP 4, PHP 5, PHP 7)</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
<code class="parameter">needle</code> substring occurs in the
<code class="parameter">haystack</code> string. Please note that
<code class="parameter">needle</code> 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>
<code class="parameter">haystack</code></dt>
<dd>
<p class="para">
The string to search in
</p>
</dd>
<dt>
<code class="parameter">needle</code></dt>
<dd>
<p class="para">
The substring to search for
</p>
</dd>
<dt>
<code class="parameter">offset</code></dt>
<dd>
<p class="para">
The offset where to start counting. If the offset is negative, counting
starts from the end of the string.
</p>
</dd>
<dt>
<code class="parameter">length</code></dt>
<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 <code class="parameter">haystack</code> length.
A negative length counts from the end of <code class="parameter">haystack</code>.
</p>
</dd>
</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>7.1.0</td>
<td>
Support for negative <code class="parameter">offset</code>s and <code class="parameter">length</code>s has been added.
<code class="parameter">length</code> may also be <em>0</em> now.
</td>
</tr>
<tr>
<td>5.1.0</td>
<td>
Added the <code class="parameter">offset</code> and
the <code class="parameter">length</code> 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-6122">
<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>
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