PHP Exercises: Create a new string from a given string. If the first or first two characters is 'a', return the string without those 'a' characters otherwise return the original given string
PHP Basic Algorithm: Exercise-85 with Solution
Write a PHP program to create a new string from a given string. If the first or first two characters is 'a', return the string without those 'a' characters otherwise return the original given string.
Sample Solution:
PHP Code :
<?php
function test($s1)
{
if (strlen($s1) == 1 && substr($s1, 0, 1) == "a")
{
$s1 = substr($s1, 1);
}
if (strlen($s1) > 1)
{
if (substr($s1, 1, 1) == "a")
{
$s1 = substr($s1, 0, 1).substr($s1, 2);
}
if (substr($s1, 0, 1) == "a")
{
$s1 = substr($s1, 1);
}
}
return $s1;
}
echo test("abcab") . "\n";
echo test("Python") . "\n";
echo test("aacda") . "\n";
echo test("jython") . "\n";
Sample Output:
bcab Python cda jython
Flowchart:
PHP Code Editor:
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Previous: Write a PHP program to create a new string from a given string without the first and last character if the first or last characters are 'a' otherwise return the original given string.
Next: Write a PHP program to check a given array of integers of length 1 or more and return true if 10 appears as either first or last element in the given array.
What is the difficulty level of this exercise?
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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