How to make multiple page IDs simpler (array?) - wordpress

Question

The simple code below:
<?php
$callout_1 = '1';
$callout_2 = '3';
$callout_3 = '5';
?>
<ul>
<li><h3 class="title"><?php echo get_the_title($callout_1); ?></h3></li>
<li><h3 class="title"><?php echo get_the_title($callout_2); ?></h3></li>
<li><h3 class="title"><?php echo get_the_title($callout_3); ?></h3></li>
</ul>
I have lots of more stuff inside the <li> tags, but all has the same structure, the above sample is just an example. Can anyone help me to make it easier please?
Edit: Thanks for the answer Tamil, Can you help me on another question based on this please? If 1 then echo text 1, if 2 then echo text 2 ...

Answer 1

Use array to store the page ids
Try
<?php $callout = array('1', '3', '5'); ?>
<ul>
<?php
foreach($callout as $call) {
?>
<li><h3 class="title"><?php echo get_the_title($call); ?></h3></li>
<?php } ?>

Answer 2

You can create a associative array. Its a multiple array having key=>value pair. Value is accessed by key.
`$callouts = array(array('id'=>1, 'text'=>'text1'), array('id'=>2, 'text'=>'text2'),array('id'=>3, 'text'=>'text3'));`
So now while looping you can print both id and text.
foreach( $callouts as $call ) {
echo '<li><h3>'.get_the_title($call['id']).'</h3></li>';
echo '<p>'.$call['text'].'</p>';
}
If you have to get the value and store in array:
$ids = array('1','2','3');
$callouts = array();
foreach($ids as $id ){
$title = get_the_title($id);
if( $id == 1)
$text = 'Text 1';
elseif($id == 2)
$text = 'Text 2';
else
$text = '';
$callouts[] = array('id'=>$id, 'title'=>$title, 'text'=>$text);
}
To print, you can use single array to print everything.
foreach( $callouts as $call ){
echo '<li><h3>'.$call['id'].'<h3></li>';
echo '<li><h3>'.$call['title'].'<h3></li>';
echo '<li><h3>'.$call['text'].'<h3></li>';
}
Hope this helps