PHP Array Exercises : Count the total number of times a specific value appears in an array
PHP Array: Exercise-37 with Solution
Write a PHP script to count the total number of times a specific value appears in an array.
Sample Solution:
PHP Code:
<?php
function count_array_values($my_array, $match)
{
$count = 0;
foreach ($my_array as $key => $value)
{
if ($value == $match)
{
$count++;
}
}
return $count;
}
$colors = array("c1"=>"Red", "c2"=>"Green", "c3"=>"Yellow", "c4"=>"Red");
echo "\n"."Red color appears ".count_array_values($colors, "Red"). " time(s)."."\n";
?>
Sample Output:
Red color appears 2 time(s).
Flowchart:
PHP Code Editor:
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Previous: Write a PHP script to lower-case and upper-case, all elements in an array.
Next: Write a PHP function to create a multidimensional unique array for any single key index.
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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
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