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PHP Exercises : Get the last occurred error

PHP : Exercise-20 with Solution

Write a PHP script to get the last occurred error.

Sample Solution: -

PHP Code:

<?php
echo $x;
  print_r(error_get_last());
?>

Sample Output: 

Array                                                       
(                                                           
    [type] => 8                                             
    [message] => Undefined variable: x                      
    [file] => /home/students/0d0149c0-f42e-11e6-a8c0-b738b9f
f32f9.php                                                   
    [line] => 2                                             
)

Flowchart:

Flowchart: Get the last occurred error

Note: error_get_last() function returns an associative array describing the last error with keys "type", "message", "file" and "line". If the error has been caused by a PHP internal function then the "message" begins with its name. Returns NULL if there hasn't been an error yet.

PHP Code Editor:

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Previous: Arithmetic operations on character variables : $d = 'A00'. Using this variable print the following numbers.
Next: Write a PHP function to test whether a number is greater than 30, 20 or 10 using ternary operator.

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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