PHP Array Exercises : Search a specified value within the values of an associative array

Last update on May 30 2022 11:48:13 (UTC/GMT +8 hours)

PHP Array: Exercise-33 with Solution

Write a PHP function to search a specified value within the values of an associative array.

Sample Solution:

PHP Code:

<?php
function arraysearch($arra1, $search)
{
reset($arra1);
while (list ($key, $val) = each ($arra1)) 
{
if (preg_match ("/$search/i", $val)) 
{
   echo $search." has found in ".$key."\n";
} 
else 
{
    echo $search." has not found in ".$key."\n";
}
}
}
$exercises = array("part1"=>"PHP array", "part2"=>"PHP String", "part3"=>"PHP Math");
arraysearch($exercises, "Math");
?>

Sample Output:

Math has not found in part1                                 
Math has not found in part2                                 
Math has found in part3

Flowchart:

PHP Code Editor:

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Previous: Write a PHP program to get the extension of a file.
Next: Write a PHP program to sort an associative array (alphanumeric with case-sensitive data) by values.

What is the difficulty level of this exercise?

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC