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<title>Computes the difference of arrays with additional index check</title>
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<div class="refnamediv">
<h1 class="refname">array_diff_assoc</h1>
<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">array_diff_assoc</span> — <span class="dc-title">Computes the difference of arrays with additional index check</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.array-diff-assoc-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">array</span> <span class="methodname"><strong>array_diff_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="para rdfs-comment">
Compares <em><code class="parameter">array1</code></em> against <em><code class="parameter">array2</code></em> and
returns the difference. Unlike <span class="function"><a href="function.array-diff.html" class="function">array_diff()</a></span> the array
keys are also used in the comparison.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.array-diff-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 to compare from
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">array2</code></em></span>
<dd>
<p class="para">
An array to compare against
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">...</code></em></span>
<dd>
<p class="para">
More arrays to compare against
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.array-diff-assoc-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns an <span class="type"><a href="language.types.array.html" class="type array">array</a></span> containing all the values from
<em><code class="parameter">array1</code></em> that are not present in any of the other arrays.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.array-diff-assoc-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-4937">
<p><strong>Example #1 <span class="function"><strong>array_diff_assoc()</strong></span> example</strong></p>
<div class="example-contents"><p>
In this example you see the <em>"a" => "green"</em>
pair is present in both arrays and thus it is not in the output from the
function. Unlike this, the pair <em>0 => "red"</em>
is in the output because in the second argument <em>"red"</em>
has key which is <em>1</em>.
</p></div>
<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">$array2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_diff_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</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
(
[b] => brown
[c] => blue
[0] => red
)
</pre></div>
</div>
</div>
</p>
<p class="para">
<div class="example" id="example-4938">
<p><strong>Example #2 <span class="function"><strong>array_diff_assoc()</strong></span> example</strong></p>
<div class="example-contents"><p>
Two values from <em class="emphasis">key => value</em> pairs are
considered equal only if <em>(string) $elem1 === (string)
$elem2 </em>. In other words a strict check takes place so
the string representations must be the same.
</p></div>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$array1 </span><span style="color: #007700">= array(</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"00"</span><span style="color: #007700">, </span><span style="color: #DD0000">"01"</span><span style="color: #007700">, </span><span style="color: #DD0000">"2"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_diff_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">$result</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
Array
(
[0] => 0
[1] => 1
)
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 notes" id="refsect1-function.array-diff-assoc-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>:
<span class="simpara">
This function only checks one dimension of a n-dimensional
array. Of course you can check deeper dimensions by using, for example,
<em>array_diff_assoc($array1[0], $array2[0]);</em>.
</span>
</p></blockquote>
</div>
<div class="refsect1 seealso" id="refsect1-function.array-diff-assoc-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<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-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-intersect-assoc.html" class="function" rel="rdfs-seeAlso">array_intersect_assoc()</a> - Computes the intersection of arrays with additional index check</span></li>
</ul>
</p>
</div>
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