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POHow to validate input field using php
 

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  1. POHow to validate input field using php
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    <p>I've a contact form, and the last field is a math question to be answered from preventing spam emails. what is best way to check if its only a number, no other characters, &amp; answer should be 15. Also ff possible, how make the form clear after its been submitted? </p> <p>HTML code:</p> <pre><code>&lt;p id="math"&gt;10 + 5 =&lt;input type="text" name="answerbox" id="answerbox" value="&lt;?= isset($_POST['answerbox']) ? $_POST['answerbox'] : '' ?&gt;"/&gt;&lt;/p&gt; </code></pre> <p>I've tried using ctype_digit function, but no luck, didn't work.</p> <pre><code>if(ctype_digit($answerbox != 15) === true){ $errors[] = "Math answer is not correct."; } </code></pre> <p>Full php code:</p> <pre><code>&lt;?php if(empty($_POST) === false) { $errors = array(); $name = trim($_POST["name"]); $email = trim($_POST["email"]); $subject = trim($_POST["subject"]); $message = trim($_POST["message"]); $answerbox = trim($_POST["answerbox"]); if(empty($name) === true || empty($email) === true || empty($subject) === true || empty($message) === true || empty($answerbox) === true){ $errors[] = '&lt;p class="formerrors"&gt;Please fill in all fields.&lt;/p&gt;'; } else { if (strlen($name) &gt; 25) { $errors[] = 'Your name is too long.'; } if (ctype_alpha($name) === false) { $errors[] = "Your name only should be in letters."; } if(!preg_match("/^[_\.0-9a-zA-Z-]+@([0-9a-zA-Z][0-9a-zA-Z-]+\.)+[a-zA-Z]{2,6}$/i", $email)){ $errors[] = "Your email address is not valid, please check."; } if($answerbox != 15){ $errors[] = "Math answer is not correct."; } if(empty($errors) === true) { $headers = 'From: '.$email. "\r\n" . 'Reply-To: '.$email . "\r\n" . 'X-Mailer: PHP/' . phpversion(); mail('me@mymail.me',$subject,$message,$headers); print "&lt;p class='formerrors'&gt;Thank you for your message, I'll get back to you shortly!&lt;/p&gt;"; } } } ?&gt; &lt;?php if (empty($errors) === false){ foreach ($errors as $error) { echo'&lt;p class="formerrors"&gt;', $error, '&lt;/p&gt;'; } } ?&gt; </code></pre>
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    1. USuser2120702
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    1. COlook at `is_numeric` http://php.net/manual/en/function.is-numeric.php for the first problem
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      1. POHow to validate input field using php
      1. USdavidkonrad
    2. COThank you for the link.I will try it.
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      1. USuser2120702
 

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