PHP Exercises : Display strings
PHP : Exercise-2 with Solution
Write a PHP script to display the following strings.
Sample Strings :
'Tomorrow I \'ll learn PHP global variables.''This is a bad command : del c:\\*.*'
String: A string is series of characters, where a character is the same as a byte. PHP supports a 256-character set, and hence does not offer native Unicode support.
Note: As of PHP 7.0.0, there are no particular restrictions regarding the length of a string on 64-bit builds. On 32-bit builds and in earlier versions, a string can be as large as up to 2GB (2147483647 bytes maximum).
A string literal can be specified in four different ways:
- single quoted: The simplest way to specify a string is to enclose it in single quotes (the character ').
- double quoted: The simplest way to specify a string is to enclose it in single quotes (the character ").
- heredoc syntax: A third way to delimit strings is the heredoc syntax: <<<. After this operator, an identifier is provided, then a newline.
- nowdoc syntax (since PHP 5.3.0): Nowdocs are to single-quoted strings what heredocs are to double-quoted strings. A nowdoc is specified similarly to a heredoc, but no parsing is done inside a nowdoc.
Sample Solution: -
PHP Code:
<?php
echo "Tomorrow I \'ll learn PHP global variables."."\n";
echo "This is a bad command : del c:\\*.*"."\n";
?>
Sample Output:
Tomorrow I 'll learn PHP global variables. This is a bad command : del c:\*.*
Flowchart:
PHP Code Editor:
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Previous: Write a PHP script to get the PHP version and configuration information.
Next: $var = 'PHP Tutorial'. Put this variable into the title section, h3 tag and as an anchor text within an HTML document.
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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