How to check if post field is from 8 - 20 characters long

Question

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PHP strlen question

how to check if text from post field is 8 - 20 characters long? Is it done with strlen, and could you give me some example, please?

really, you can't even be bothered to try and hit `http://php.net/strlen`? — Marc B, Oct 19 '11 at 17:08
Or, for example, http://stackoverflow.com/questions/2492926/php-strlen-question — John Flatness, Oct 19 '11 at 17:11

score 0 · Answer 1 · answered Oct 19 '11 at 17:11

0

It's easy:

$item = $_POST['item'];
if (strlen($item) >= 8 && strlen($item) <= 20) { /*do something*/ }

Good luck! Konstantin

answered Oct 19 '11 at 17:11

Konstantin Yovkov

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score 0 · Accepted Answer · answered Oct 19 '11 at 17:11

0

$variable = $_POST['your-field-name']; // or $_GET['']; depends on your post method

if(strlen($variable) > 7 && strlen($variable) < 21) {
 return true;
} else {
 return false;
}

answered Oct 19 '11 at 17:11

Grigor

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and what will happen if I use if(strlen($variable) > 7 || strlen($variable) < 21) instead of &&? – Y2ok Oct 19 '11 at 17:14
any number would work because 0 is smaller than 21 and 30 is larger than 7, || checks for one of the conditions to be true – Grigor Oct 19 '11 at 18:03

erisco · Answer 3 · 2011-10-19T18:06:43.087

0

<?php

// get the length of the text. we take the value by reference
// because there is the risk it doesn't exist (such as when
// no data is submitted).
$textLen = strlen($myTextField = &$_POST['my_text_field']);

// test its length
if ($textLen >= 8 && $textLen <= 20) {
    echo 'Text is the right length.';
} else {
    echo 'Text is the wrong length.';
}

edited Oct 19 '11 at 18:06

answered Oct 19 '11 at 17:14

erisco

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score 0 · Answer 4 · answered Oct 19 '11 at 17:14

The easiest option is to use strlen:

strlen($_POST['shinyHappyString']) > 7 && strlen($_POST['shinyHappyString']) < 21

However, if you encounter multi-byte strings, you are in trouble. Therefore I recommend you to use grapheme_strlen or mb_strlen instead. You can check how they use it in Symfony2's validators.

How to check if post field is from 8 - 20 characters long

4 Answers4