php_arrays.asp

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<p>When storing data about specific named values, a numerical array is not 
always the best way to do it.</p>
<p>With associative arrays we can use the values as keys and assign values 
to them.</p>
<h3>Example 1</h3>
<p>In this example we use an array to assign ages to the different persons:</p>
<table class="ex" cellspacing="0" width="100%" border="1" id="table26">
  <tr>
    <td>
    <pre>$ages = array(&quot;Peter&quot;=&gt;32, &quot;Quagmire&quot;=&gt;30, &quot;Joe&quot;=&gt;34);</pre>
    </td>
  </tr>
</table>
<h3>Example 2</h3>
<p>This example is the same as example 1, but shows a different way of 
creating the array:</p>
<table class="ex" cellspacing="0" width="100%" border="1" id="table27">
  <tr>
    <td>
    <pre>$ages['Peter'] = &quot;32&quot;;
$ages['Quagmire'] = &quot;30&quot;;
$ages['Joe'] = &quot;34&quot;;</pre>
    </td>
  </tr>
</table>
<p>The ID keys can be used in a script:</p>
<table class="ex" cellspacing="0" width="100%" border="1" id="table31">
  <tr>
    <td>
    <pre>&lt;?php</pre>
	<pre>$ages['Peter'] = &quot;32&quot;;
$ages['Quagmire'] = &quot;30&quot;;
$ages['Joe'] = &quot;34&quot;;</pre>
	<pre>echo &quot;Peter is &quot; . $ages['Peter'] . &quot; years old.&quot;;
?&gt;</pre>
    </td>
  </tr>
</table>
<p>The code above will output:</p>
<table class="ex" cellspacing="0" width="100%" border="1" id="table32">
  <tr>
    <td>
    <pre>Peter is 32 years old.</pre>
    </td>
  </tr>
</table>
<br />
<hr />

<h2><b>Multidimensional</b> Arrays</h2>
<p>In a multidimensional array, each element in the main array can also be an array. 
And each element in the sub-array can be an array, and so on.</p>
<h3>Example</h3>
<p>In this example we create a multidimensional array, with automatically 
assigned ID keys:</p>
<table class="ex" cellspacing="0" width="100%" border="1" id="table18">
  <tr>
    <td>
    <pre>$families = array
(
  &quot;Griffin&quot;=&gt;array
  (
  &quot;Peter&quot;,
  &quot;Lois&quot;,
  &quot;Megan&quot;
  ),
  &quot;Quagmire&quot;=&gt;array
  (
  &quot;Glenn&quot;
  ),
  &quot;Brown&quot;=&gt;array
  (
  &quot;Cleveland&quot;,
  &quot;Loretta&quot;,
  &quot;Junior&quot;
  )
);</pre>
    </td>
  </tr>
</table>
<p>The array above would look like this if written to the output:</p>
<table class="ex" cellspacing="0" width="100%" border="1" id="table28">
  <tr>
    <td>
    <pre>Array
(
[Griffin] =&gt; Array
  (
  [0] =&gt; Peter
  [1] =&gt; Lois
  [2] =&gt; Megan
  )
[Quagmire] =&gt; Array
  (
  [0] =&gt; Glenn
  )
[Brown] =&gt; Array
  (
  [0] =&gt; Cleveland
  [1] =&gt; Loretta
  [2] =&gt; Junior
  )
) </pre>
    </td>
  </tr>
</table>
<h3>Example 2</h3>
<p>Lets try displaying a single value from the array above:</p>
<table class="ex" cellspacing="0" width="100%" border="1" id="table36">
  <tr>
    <td>
    <pre>echo &quot;Is &quot; . $families['Griffin'][2] . 
&quot; a part of the Griffin family?&quot;;</pre>
    </td>
  </tr>
</table>
<p>The code above will output:</p>
<table class="ex" cellspacing="0" width="100%" border="1" id="table38">
  <tr>
    <td>
    <pre>Is Megan a part of the Griffin family?</pre>
    </td>
  </tr>
</table>
<br />
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