How to Get title by id in 2D array?

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Assuming that your ids are unique (!), you could simply use an associative array instead:

$yourArrray = array(
    2 => array('title' => 'Test', 'alt_text' => 'This is test'),
    3 => array('title' => 'Test1', 'alt_text' => 'This is test1'),
    7 => array('title' => 'Test2', 'alt_text' => 'This is test2')
);

This way, your lookup would be as easy as:

$yourArray[$id]['title']

For example:

$title = $yourArray[2]['title'] // $title Now contains "Test"

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