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PHP Regular Expression Exercise: Remove all characters from a string except a-z A-Z 0-9 or " "

PHP regular expression: Exercise-7 with Solution

Write a PHP script to remove all characters from a string except a-z A-Z 0-9 or " ".

Sample string: abcde$ddfd @abcd )der]

Pictorial Presentation:

PHP Regular Expression Exercise: Remove all characters from a string except a-z A-Z 0-9

Sample Solution:

PHP Code:

<?php
$string = 'abcde$ddfd @abcd )der]';
echo 'Old string : '.$string.'
';
$newstr = preg_replace("/[^A-Za-z0-9 ]/", '', $string);
echo 'New string : '.$newstr."\n";
?>

Sample Output: 

Old string : abcde$ddfd @abcd )der]                         
New string : abcdeddfd abcd der

Flowchart :

Flowchart: PHP Regular Expression Exercise - Remove all characters from a string except a-z A-Z 0-9 or " "

PHP Code Editor:

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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