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<title>Computes the intersection of arrays with additional index check</title>
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<h1 class="refname">array_intersect_assoc</h1>
<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">array_intersect_assoc</span> — <span class="dc-title">Computes the intersection of arrays with additional index check</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.array-intersect-assoc-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">array</span> <span class="methodname"><strong>array_intersect_assoc</strong></span>
( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array1</code></span>
, <span class="methodparam"><span class="type">array</span> <code class="parameter">$array2</code></span>
[, <span class="methodparam"><span class="type">array</span> <code class="parameter">$...</code></span>
] )</div>
<p class="simpara">
<span class="function"><strong>array_intersect_assoc()</strong></span> returns an array
containing all the values of <em><code class="parameter">array1</code></em>
that are present in all the arguments. Note that the keys are used in
the comparison unlike in <span class="function"><a href="function.array-intersect.html" class="function">array_intersect()</a></span>.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.array-intersect-assoc-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">array1</code></em></span>
<dd>
<p class="para">
The array with master values to check.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">array2</code></em></span>
<dd>
<p class="para">
An array to compare values against.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">...</code></em></span>
<dd>
<p class="para">
A variable list of arrays to compare.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.array-intersect-assoc-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns an associative array containing all the values in
<em><code class="parameter">array1</code></em> that are present in all of the arguments.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.array-intersect-assoc-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-4949">
<p><strong>Example #1 <span class="function"><strong>array_intersect_assoc()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$array1 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"b" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"brown"</span><span style="color: #007700">, </span><span style="color: #DD0000">"c" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"b" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result_array </span><span style="color: #007700">= </span><span style="color: #0000BB">array_intersect_assoc</span><span style="color: #007700">(</span><span style="color: #0000BB">$array1</span><span style="color: #007700">, </span><span style="color: #0000BB">$array2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$result_array</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
Array
(
[a] => green
)
</pre></div>
</div>
</div>
</p>
<p class="simpara">
In our example you see that only the pair <em>"a" =>
"green"</em> is present in both arrays and thus is returned.
The value <em>"red"</em> is not returned because in
<var class="varname"><var class="varname">$array1</var></var> its key is <em>0</em> while
the key of "red" in <var class="varname"><var class="varname">$array2</var></var> is
<em>1</em>, and the key <em>"b"</em> is not returned
because its values are different in each array.
</p>
<p class="simpara">
The two values from the <em>key => value</em> pairs are
considered equal only if
<em>(string) $elem1 === (string) $elem2 </em>. In other words
a strict type check is executed so the string representation must be
the same.
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.array-intersect-assoc-seealso">
<h3 class="title">See Also</h3>
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.array-intersect.html" class="function" rel="rdfs-seeAlso">array_intersect()</a> - Computes the intersection of arrays</span></li>
<li class="member"> <span class="function"><a href="function.array-uintersect-assoc.html" class="function" rel="rdfs-seeAlso">array_uintersect_assoc()</a> - Computes the intersection of arrays with additional index check, compares data by a callback function</span></li>
<li class="member"> <span class="function"><a href="function.array-intersect-uassoc.html" class="function" rel="rdfs-seeAlso">array_intersect_uassoc()</a> - Computes the intersection of arrays with additional index check, compares indexes by a callback function</span></li>
<li class="member"> <span class="function"><a href="function.array-uintersect-uassoc.html" class="function" rel="rdfs-seeAlso">array_uintersect_uassoc()</a> - Computes the intersection of arrays with additional index check, compares data and indexes by a callback functions</span></li>
<li class="member"> <span class="function"><a href="function.array-diff.html" class="function" rel="rdfs-seeAlso">array_diff()</a> - Computes the difference of arrays</span></li>
<li class="member"> <span class="function"><a href="function.array-diff-assoc.html" class="function" rel="rdfs-seeAlso">array_diff_assoc()</a> - Computes the difference of arrays with additional index check</span></li>
</ul>
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