如何使用php中的值获取数组的索引

Question

<?php
    $interests[50] = array('fav_beverages' => "beer");
?>

now i need the index (i.e. 50 or whatever the index may be) from the value beer.

I tried array_search(), array_flip(), in_array(), extract(), list() to get the answer.

please do let me know if I have missed out any tricks for the above functions or any other function I`ve not listed. Answers will be greatly appreciated.

thanks for the replies. But for my disappointment it is still not working. btw I have a large pool of data like "beer"); $interests[50] = array('fav_cuisine' => "arabic"); $interests[50] = array('fav_food' => "hummus"); ?> . my approach was to get the other data like "arablic" and "hummus" from the user input "beer". So my only connection is via the index[50].Do let me know if my approach is wrong and I can access the data through other means.My senior just informed me that I`m not supposed to use loop.

Answer 1

If your array contains multiple sub-arrays and you don't know which one contains the value beer, then you can simply loop through the arrays, and then through the sub-arrays, to search for the value, and then return the index if it is found:

$needle = 'beer';

foreach ($interests as $index => $arr) {
    foreach ($arr as $value) {
        if ($value == $needle) {
            echo $index;
            break;
        }
    }
}

Demo