PHP $GLOBALS (super global) variable

Last update on May 28 2022 12:32:46 (UTC/GMT +8 hours)

Description

$GLOBAL is a php super global variable which can be used instead of 'global' keyword to access variables from global scope, i.e. the variables which can be accessed from anywhere in a php script even within functions or methods.

Here is an example to testify the theory mentioned above:

<?php
$s = 25;
$t = 50;
function subtraction()
{
$GLOBALS['v'] = $GLOBALS['t'] - $GLOBALS['s'];
} 
subtraction();
echo $v;
?>

In the code above, since v is a variable present within $GLOBALS array, it is accessible form outside the function also.

View the example of $GLOBALS variable in the browser

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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