Level 75
Validation.
May 17, 2022
13
Level 2
Limit number of characters in input field with PHP
hi Is there away to limit the number of characters in php for example in html we use maxlength
<input type = "text" name = "first_name" value = "" maxlength = "40" />
What about php what can we use?
Level 2
@MichalOravec is it only from controller ? we can not validate from view? I mean my instructor told to validate it from both controller and view, so I was thinking to convert all the php to html or find away to validate php from the view
Level 73
@alya_alsiyabi No, there isn't with php, you will have to use Javascript for that unless you are satisfied with just setting length in your html
Level 2
@Tray2 thank you sir
Level 13
Well you can use these snippets ->
// For Laravel
$request->validate([
'first_name' => 'required|max:20',
'for_number' => 'required|digits:20',
]);
// For native php
if(strlen($input) > 20)
{
echo "Input cannot be higher than 20 characters";
}
// For javascript
if(input.length > 20) {
alert('Input cant be higher than 20 characters.');
}
Level 2
@iftekhs is it only from controller ? we can not validate from view? I mean my instructor told to validate it from both controller and view, so I was thinking to convert all the php to html or find away to validate php from the view
Level 73
@alya_alsiyabi See my reply above.
Level 13
@alya_alsiyabi Well I don't think it's possible from the view because the HTML is sent to the client-side what you can do is validate it in the view using javascript. and validate in the controller using the $request->validate([]).
1 like
Level 104
@alya_alsiyabi PHP runs on the server not in the browser - the maxlength attribute will work. But you must be aware that a malicious user can modify the markup, and therefore validate in the Controller (or Form Request) as well
1 like
Level 2
@tykus thanks sir got that
Level 2
@iftekhs thanks sir got that
Level 122
Please note that the character count can be wrong if you allow html input in the field. User does not get to enter as many characters as they think they should because of hidden html. The same for multi-byte characters.
1 like
Level 2
@Snapey thank you sir
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