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<h1>PHP array_intersect_key() Function</h1>
<hr />
<a href="php_ref_array.asp"><img class="navup" src="../images/up.gif" alt="PHP Array Reference" border="0" /> Complete PHP Array Reference</a>
<hr />

<h2>Definition and Usage</h2>

<p>The array_intersect_key() function compares two or more arrays,
and returns an array with the keys and values from the first array, only if the 
key is present in all of the other arrays.</p>
<h2>Syntax</h2>

<table class="ex" cellspacing="0" border="1" width="100%">
  <tr>
    <td>
    <pre>array_intersect_key(array1,array2,array3...)</pre>
    </td>
</tr>
</table>
<br />

<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3"> 
  <tr>
    <th align="left" valign="top" width="20%">Parameter</th>
    <th align="left" valign="top" width="80%">Description</th>
  </tr>  
  <tr>
    <td valign="top">array1</td>
    <td valign="top">Required. The first array is the array that the others will be compared with</td>
  </tr>
  <tr>
    <td valign="top">array2</td>
    <td valign="top">Required. An array to be compared with the first array</td>
  </tr>
  <tr>
    <td valign="top">array3</td>
    <td valign="top">Optional. An array to be compared with the first array</td>
  </tr>
  </table>
<br />


<hr />

<h2>Tips and Notes</h2>

<p><b>Tip:</b> You can compare the first array with one array, or as many as you like.</p>
<p><b>Note:</b> Only the key is used in the comparison.</p>
<hr />

<h2>Example 1</h2>
12

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