PHP String Exercises: Replace the first word with another word
PHP String: Exercise-10 with Solution
Write a PHP script to replace the first 'the' of the following string with 'That'.
Sample date: 'the quick brown fox jumps over the lazy dog.'
Pictorial Presentation:
Sample Solution:
PHP Code:
<?php
$str = 'the quick brown fox jumps over the lazy dog.';
echo preg_replace('/the/', 'That', $str, 1)."\n";
?>
Sample Output:
That quick brown fox jumps over the lazy dog.
Flowchart:
PHP Code Editor:
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Previous: Write a PHP script to generate simple random password [do not use rand() function] from a given string.
Next: Write a PHP script to find the first character that is different between two strings.
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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
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