duanqian3464 2013-07-23 14:03
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PHP阻止提交仅包含“空格”字符的空字段

When using PHP how can I validate a simple text input to check if the field only contains space character, I want to prevent it from being possible to sign up to my website with a blank name consisting of just spaces and the same goes for other inputs such as comments? If I check if it is empty it just returns it as not empty as it considers a space as a character regardless.

For future reference the answer was to first trim my post data:

$variable = mysql_real_escape_string(stripslashes(trim($_POST['field'])));

Also sanitised it here and then as for validation, you can then just use empty():

if(empty($variable)) {
//do something
}
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  • dongxuan2015 2013-07-23 14:09
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    You can trim the posted input and see if its empty, if it is, display an error.

    if(empty(trim($_POST['comments'])))
    {
        // Its empty so throw a validation error
        echo 'Input is empty!'; 
    }
    else
    {
        // Input has some text and is not empty.. process accordingly.. 
    }
    

    More info on trim() can be found here: http://php.net/manual/en/function.trim.php

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