PHP Empty and data validation

Question

When a user submit forms,i'm checking empty validation and data validation.

For ex:In data ,first field is name,i'll check whether user has entered any other characters else than alpha character's.if he has entered then will show him an error message.Name should contain minimum of 4 characters and max of 20 characters

I'm using this code but it is not working correctly.How to check the regex.

$validate = array("Category"=>"$productCategory", "Name" => "$productName");

$error = '';

foreach ($validate as $key => $field) {

    if (preg_match('/^[a-z\d ]{4,20}$/i', $$field)) {
       echo $error .= $field;
    }
}

Thanks in advance!

Are accented characters, or other Unicode characters, allowed in names? — Geert
– Geert, Commented Jun 19, 2012 at 7:37
I find this line echo $error .= $field; pretty strange. Can anyone explain it's logic? — Andrius Naruševičius
– Andrius Naruševičius, Commented Jun 19, 2012 at 7:42
@Andrius Naruševičius : none, we all missed it :) Updated my answer to show a correct way to use $error in this context. — Radu M.
– Radu M., Commented Jun 19, 2012 at 7:51

Radu M. · Accepted Answer · 2012-06-19 08:00:02Z

3

You have a typo in the preg_match, you type $$field (2x$) instead of $field, your regex is fine it will match:

 - a character between a - z (case insensitive)
or
 - a digit between 0 - 9
or 
 - a "space" character.

Update code to answer @Andrius Naruševičius comment

$validate = array("Category" => $productCategory, "Name" => $productName);
$error = '';
foreach ($validate as $key => $field)
{
    if (preg_match('/^[a-z\d ]{4,20}$/i',$field))
    {
       $error.= $field;
    }
}

if($error)
{
    echo $error;
    exit;
}

edited Jun 19, 2012 at 8:00

answered Jun 19, 2012 at 7:37

Radu M.

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4 Comments

user1415759 Over a year ago

:a valid name can have spaces a-z,A-z & 0-9.

user1415759 Over a year ago

:Where to add error messages.Say,i've 10 regex and 10 feild,how do i use this in this logic.When form submitted,if 5 error all should be showed to user.

Radu M. Over a year ago

@user1415759 Removed \w and added a-z in the regex (\w allows a what you need + the underscore character). Second, it will print all 5 errors and exit the code, you don't whant to continue execution after an error occured ...

user1415759 Over a year ago

:I wrote an update,check you check my code.How do i validate empty field.

Sudhir Bastakoti · Accepted Answer · 2012-06-19 07:38:35Z

2

Do you mean:

$validate = array("Category"=>$productCategory, "Name" => $productName);

foreach ($validate as $key => $field) {

    if (preg_match('/^[\w\d]{4,20}$/i',$field)) {
       echo $error .= $field;
    }
}

answered Jun 19, 2012 at 7:38

Sudhir Bastakoti

100k15 gold badges163 silver badges169 bronze badges

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