PHP String Exercises: Insert a string at the specified position in a given string

Last update on May 30 2022 11:45:17 (UTC/GMT +8 hours)

PHP String: Exercise-17 with Solution

Write a PHP script to insert a string at the specified position in a given string.

Original String : 'The brown fox'
Insert 'quick' between 'The' and 'brown'.

Pictorial Presentation:

PHP String Exercises: Insert a string at the specified position in a given string

Sample Solution:

PHP Code:

<?php
$original_string = 'The brown fox';
$string_to_insert ='quick';
$insert_pos = 4;
$new_string = substr_replace($original_string, $string_to_insert.' ', $insert_pos, 0);
echo $new_string."\n";
?>

Sample Output:

The quick brown fox

Flowchart :

Flowchart: Insert a string at the specified position in a given string

PHP Code Editor:

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Previous: Write a PHP script to get a hex dump of a string.
Next: Write a PHP script to get the first word of a sentence.

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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