I would like to extract random substrings form a string, how could I do this?
Let's say I have this string as one word:
$string = "myawesomestring";
and as an output I want an random response like this with extracted substrings
myaweso myawe somestr
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What have you tried so far? Where are you stuck?Nico Haase– Nico Haase2020-10-12 09:39:04 +00:00Commented Oct 12, 2020 at 9:39
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2 Answers
You need the length of the string, and, of course a random number.
function getRandomSubstring($text) {
$random1 = rand(0, mb_strlen($text));
$random2 = rand($random1, mb_strlen($text));
return substr($text, $random1, $random2);
}
6 Comments
Jeto
I fixed a typo in there. Your function can return an empty string though, which probably isn't wanted.
mikey
This works - OP may want to run this in a loop to match their desired output (multiple instances on the same line). Also worth noting not everyone may have mb_strlen available (stackoverflow.com/a/6419126/3080207).
user2534787
Sometimes it shows a blank response but basically, it works. Thank you!
Jeto
@user2534787 That's what I meant by my first comment. Use
mb_strlen($text) - 1 instead on the first line to prevent it.
JD Savaj
i try this code but it's not work proper _____________________<?php echo $string = 'myawesomestring'; function getRandomSubstring($text) { $random1 = rand(0, mb_strlen($text)); $random2 = rand($random1, mb_strlen($text)); return substr($text, $random1, $random2); } $output_data = getRandomSubstring($string); echo $output_data; ?>_____________output_data in value not found blank data given.
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Try this code:
<?php
$str = "myawesomestring";
$l = strlen($str);
$i = 0;
while ($i < $l) {
$r = rand(1, $l - $i);
$chunks[] = substr($str, $i, $r);
$i += $r;
}
echo "<pre>";
print_r($chunks);
?>
2 Comments
Nico Haase
Please add some explanation to your answer such that others can learn from it. How does this snippet use random substrings?
Nico Haase
Can you explain what that code does? When I execute it, it shows only a pretty limited amount of substrings, and they never share the same letters in the front (like in the example in the question)