PHP continue Statement

Last update on May 28 2022 12:33:33 (UTC/GMT +8 hours)

Description

Sometimes a situation arises where we want to take the control to the beginning of the loop (for example for, while, do while etc.) skipping the rest statements inside the loop which have not yet been executed.

The keyword continue allow us to do this. When the keyword continue executed inside a loop the control automatically passes to the beginning of loop. Continue is usually associated with the if.

Example:

In the following example, the list of odd numbers between 1 to 10 have printed. In the while loop we test the remainder (here $x%2) of every number, if the remainder is 0 then it becomes an even number and to avoid printing of even numbers continue statement is immediately used and the control passes to the beginning of the loop.

<?php
$x=1;
echo 'List of odd numbers between 1 to 10 <br />';
while ($x<=10)
{
if (($x % 2)==0)
{
$x++;
continue;
}
else
{
echo $x.'<br />';
$x++;
}
}

Output

List of odd numbers between 1 to 10
1
3
5
7
9

View the example 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