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function.strpos.rst

Synopsis

Find the position of the first occurrence of a substring in a string

Description

System Message: ERROR/3 (<stdin>, line 8)

Unknown directive type "signature".

.. signature::
    int function strpos(
        string $haystack,
        mixed $needle,
        int $offset = 0
    )

Find the numeric position of the first occurrence of $needle in the $haystack string.

Parameters

$haystack
The string to search in.
$needle
If $needle is not a string, it is converted to an integer and applied as the ordinal value of a character.
$offset
If specified, search will start this number of characters counted from the beginning of the string. Unlike FUNCTION:strrpos and FUNCTION:strripos, the offset cannot be negative.

Return values

Returns the position of where the needle exists relative to the beginning of the $haystack string (independent of offset). Also note that string positions start at 0, and not 1. Returns FALSE if the needle was not found.

Warning

This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

EXAMPLES

Using _===_

System Message: ERROR/3 (<stdin>, line 47)

Unknown directive type "code".

.. code:: php

    <?php
    $mystring = 'abc';
    $findme   = 'a';
    $pos = strpos($mystring, $findme);

    // Note our use of ===.  Simply == would not work as expected
    // because the position of 'a' was the 0th (first) character.
    if ($pos === false) {
        echo "The string '$findme' was not found in the string '$mystring'";
    } else {
        echo "The string '$findme' was found in the string '$mystring'";
        echo " and exists at position $pos";
    }
    ?>

Using !==

System Message: ERROR/3 (<stdin>, line 67)

Unknown directive type "code".

.. code:: php

    <?php
    $mystring = 'abc';
    $findme   = 'a';
    $pos = strpos($mystring, $findme);

    // The !== operator can also be used.  Using != would not work as expected
    // because the position of 'a' is 0. The statement (0 != false) evaluates
    // to false.
    if ($pos !== false) {
        echo "The string '$findme' was found in the string '$mystring'";
        echo " and exists at position $pos";
    } else {
        echo "The string '$findme' was not found in the string '$mystring'";
    }
    ?>

Using an offset

System Message: ERROR/3 (<stdin>, line 87)

Unknown directive type "code".

.. code:: php

    <?php
    // We can search for the character, ignoring anything before the offset
    $newstring = 'abcdef abcdef';
    $pos = strpos($newstring, 'a', 1); // $pos = 7, not 0
    ?>

Notes

Note

This function is binary-safe.

raw

function.strpos.rst.html

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<div class="section" id="synopsis">
<h1>Synopsis</h1>
<p>Find the position of the first occurrence of a substring in a string</p>
</div>
<div class="section" id="description">
<h1>Description</h1>
<div class="system-message">
<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">function.strpos.rst</tt>, line 8)</p>
<p>Unknown directive type &quot;signature&quot;.</p>
<pre class="literal-block">
.. signature::
    int function strpos(
        string $haystack,
        mixed $needle,
        int $offset = 0
    )
 
</pre>
</div>
<p>Find the numeric position of the first occurrence of <tt class="docutils literal">$needle</tt> in the
<tt class="docutils literal">$haystack</tt> string.</p>
</div>
<div class="section" id="parameters">
<h1>Parameters</h1>
<dl class="docutils">
<dt><tt class="docutils literal">$haystack</tt></dt>
<dd>The string to search in.</dd>
<dt><tt class="docutils literal">$needle</tt></dt>
<dd>If <tt class="docutils literal">$needle</tt> is not a string, it is converted to an integer and applied as the ordinal value of a character.</dd>
<dt><tt class="docutils literal">$offset</tt></dt>
<dd>If specified, search will start this number of characters counted from the beginning of the string. Unlike <a class="reference external" href="function.strrpos">FUNCTION:strrpos</a> and <a class="reference external" href="function.strripos">FUNCTION:strripos</a>, the offset cannot be negative.</dd>
</dl>
</div>
<div class="section" id="return-values">
<h1>Return values</h1>
<p>Returns the position of where the needle exists relative to the beginning of the <tt class="docutils literal">$haystack</tt> string (independent of offset). Also note that string positions start at 0, and not 1.
Returns <a class="reference external" href="false">FALSE</a> if the needle was not found.</p>
<div class="warning">
<p class="first admonition-title">Warning</p>
<p class="last">This function may return Boolean <a class="reference external" href="false">FALSE</a>, but may also return a non-Boolean value which evaluates to <a class="reference external" href="false">FALSE</a>. Please read the section on <a class="reference external" href="language.types.boolean">Booleans</a> for more information. Use <a class="reference external" href="language.operators.comparison">the === operator</a> for testing the return value of this function.</p>
</div>
</div>
<div class="section" id="examples">
<h1>EXAMPLES</h1>
<div class="section" id="using">
<h2>Using _===_</h2>
<pre class="code php literal-block">
<span class="comment preproc">&lt;?php</span>
<span class="name variable">$mystring</span> <span class="operator">=</span> <span class="literal string single">'abc'</span><span class="punctuation">;</span>
<span class="name variable">$findme</span>   <span class="operator">=</span> <span class="literal string single">'a'</span><span class="punctuation">;</span>
<span class="name variable">$pos</span> <span class="operator">=</span> <span class="name builtin">strpos</span><span class="punctuation">(</span><span class="name variable">$mystring</span><span class="punctuation">,</span> <span class="name variable">$findme</span><span class="punctuation">);</span>
 
<span class="comment single">// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
</span><span class="keyword">if</span> <span class="punctuation">(</span><span class="name variable">$pos</span> <span class="operator">===</span> <span class="keyword">false</span><span class="punctuation">)</span> <span class="punctuation">{</span>
    <span class="keyword">echo</span> <span class="literal string double">&quot;The string '</span><span class="literal string interpol">$findme</span><span class="literal string double">' was not found in the string '</span><span class="literal string interpol">$mystring</span><span class="literal string double">'&quot;</span><span class="punctuation">;</span>
<span class="punctuation">}</span> <span class="keyword">else</span> <span class="punctuation">{</span>
    <span class="keyword">echo</span> <span class="literal string double">&quot;The string '</span><span class="literal string interpol">$findme</span><span class="literal string double">' was found in the string '</span><span class="literal string interpol">$mystring</span><span class="literal string double">'&quot;</span><span class="punctuation">;</span>
    <span class="keyword">echo</span> <span class="literal string double">&quot; and exists at position </span><span class="literal string interpol">$pos</span><span class="literal string double">&quot;</span><span class="punctuation">;</span>
<span class="punctuation">}</span>
<span class="comment preproc">?&gt;</span>
</pre>
</div>
<div class="section" id="id3">
<h2>Using !==</h2>
<pre class="code php literal-block">
<span class="comment preproc">&lt;?php</span>
<span class="name variable">$mystring</span> <span class="operator">=</span> <span class="literal string single">'abc'</span><span class="punctuation">;</span>
<span class="name variable">$findme</span>   <span class="operator">=</span> <span class="literal string single">'a'</span><span class="punctuation">;</span>
<span class="name variable">$pos</span> <span class="operator">=</span> <span class="name builtin">strpos</span><span class="punctuation">(</span><span class="name variable">$mystring</span><span class="punctuation">,</span> <span class="name variable">$findme</span><span class="punctuation">);</span>
 
<span class="comment single">// The !== operator can also be used.  Using != would not work as expected
// because the position of 'a' is 0. The statement (0 != false) evaluates
// to false.
</span><span class="keyword">if</span> <span class="punctuation">(</span><span class="name variable">$pos</span> <span class="operator">!==</span> <span class="keyword">false</span><span class="punctuation">)</span> <span class="punctuation">{</span>
    <span class="keyword">echo</span> <span class="literal string double">&quot;The string '</span><span class="literal string interpol">$findme</span><span class="literal string double">' was found in the string '</span><span class="literal string interpol">$mystring</span><span class="literal string double">'&quot;</span><span class="punctuation">;</span>
    <span class="keyword">echo</span> <span class="literal string double">&quot; and exists at position </span><span class="literal string interpol">$pos</span><span class="literal string double">&quot;</span><span class="punctuation">;</span>
<span class="punctuation">}</span> <span class="keyword">else</span> <span class="punctuation">{</span>
    <span class="keyword">echo</span> <span class="literal string double">&quot;The string '</span><span class="literal string interpol">$findme</span><span class="literal string double">' was not found in the string '</span><span class="literal string interpol">$mystring</span><span class="literal string double">'&quot;</span><span class="punctuation">;</span>
<span class="punctuation">}</span>
<span class="comment preproc">?&gt;</span>
</pre>
</div>
<div class="section" id="using-an-offset">
<h2>Using an offset</h2>
<pre class="code php literal-block">
<span class="comment preproc">&lt;?php</span>
<span class="comment single">// We can search for the character, ignoring anything before the offset
</span><span class="name variable">$newstring</span> <span class="operator">=</span> <span class="literal string single">'abcdef abcdef'</span><span class="punctuation">;</span>
<span class="name variable">$pos</span> <span class="operator">=</span> <span class="name builtin">strpos</span><span class="punctuation">(</span><span class="name variable">$newstring</span><span class="punctuation">,</span> <span class="literal string single">'a'</span><span class="punctuation">,</span> <span class="literal number integer">1</span><span class="punctuation">);</span> <span class="comment single">// $pos = 7, not 0
</span><span class="comment preproc">?&gt;</span>
</pre>
</div>
</div>
<div class="section" id="notes">
<h1>Notes</h1>
<div class="note">
<p class="first admonition-title">Note</p>
<p class="last">This function is binary-safe.</p>
</div>
</div>
<div class="section" id="see-also">
<h1>See also</h1>
<ul class="simple">
<li><a class="reference external" href="function.stripos">FUNCTION:stripos</a></li>
<li><a class="reference external" href="function.strrpos">FUNCTION:strrpos</a></li>
<li><a class="reference external" href="function.strripos">FUNCTION:strripos</a></li>
<li><a class="reference external" href="function.strstr">FUNCTION:strstr</a></li>
<li><a class="reference external" href="function.strpbrk">FUNCTION:strpbrk</a></li>
<li><a class="reference external" href="function.substr">FUNCTION:substr</a></li>
<li><a class="reference external" href="function.preg_match">FUNCTION:preg_match</a></li>
</ul>
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