PHP Exercises: Check whether the first two characters and last two characters of a given string are same
PHP Basic Algorithm: Exercise-80 with Solution
Write a PHP program to check whether the first two characters and last two characters of a given string are same.
Sample Solution:
PHP Code :
<?php
function test($s1)
{
return substr($s1, 0, 2) == substr($s1, strlen($s1) - 2, 2);
}
var_dump(test("abab"));
var_dump(test("abcdef"));
var_dump(test("xyzsderxy"));
Sample Output:
bool(true) bool(false) bool(true)
Flowchart:
PHP Code Editor:
Contribute your code and comments through Disqus.
Previous: Write a PHP program to check if a given string begins with 'abc' or 'xyz'. If the string begins with 'abc' or 'xyz' return 'abc' or 'xyz' otherwise return the empty string.
Next: Write a PHP program to concat two given strings. If the given strings have different length remove the characters from the longer string.
What is the difficulty level of this exercise?
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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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