PHP for loop Exercises: Count a specified characters in a string
PHP for loop: Exercise-7 with Solution
Write a program which will count the "r" characters in the text "w3resource".
Pictorial Presentation:
Sample Salution:
PHP Code:
<?php
$text="w3resource";
$search_char="r";
$count="0";
for($x="0"; $x< strlen($text); $x++)
{
if(substr($text,$x,1)==$search_char)
{
$count=$count+1;
}
}
echo $count."\n";
?>
Sample Output:
2
Flowchart:
PHP Code Editor:
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Previous: Write a program which will give you all of the potential combinations of a two-digit decimal combination, printed in a comma delimited format.
Next: Write a PHP script that creates the specific table using for loops. Add cellpadding="3px" and cellspacing="0px" to the table tag.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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