So I'm new to php and I'm trying to do a simple input filter on my html form with ctype_print($_POST["commentContent"]) but it is not recognising illegal input. But when I use ctype_print($testCase) it is working. How can I do ctype_print() on a $_POST input value. What am I missing here?
My code: Html form:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>My Recipe Site</title>
<link rel="stylesheet" type="text/css" href="mystyle.css">
</head>
<body>
<h3>Comments:</h3>
<form action="" method="POST">
<textarea rows="10" cols="30" name="commentContent"></textarea>
<br />
<input type="submit" value="Post!">
<br />
</form>
</body>
</html>
Here is the sample string i use in both $testcase and that i post to the form: "asdf \t"
Simple if php
$testCase = "asdf
\t";
if (ctype_print ( $_POST ["commentContent"] )) {
echo "Great succes for: " . $_POST ["commentContent"];
} else {
echo "DAMN, it dosent work: " . $_POST ["commentContent"];
}
echo "<br>";
if (ctype_alnum ( $testCase )) {
echo "ctype on testcase works : " . $testCase;
} else {
echo "ctype on testcase does not work : " . $testCase;
}
Your code looks fine to me I think the main problem is, that you just type the characters into the comment box, so it is just text, you can test it with a simple file_put_contents(). If you type into the textarea the string asdf \t you will get a file with the content `asdf \t.
If you type in (for example) asdf≤ENTER><ENTER> you will get a file with the content:
asdf
// newline
// newline
So I think your code works.
<?php
$testCase = "asdf
\t";
file_put_contents( "test.txt", $_POST ["commentContent"] );
if ( ctype_print( $_POST ["commentContent"] ) ) {
echo "every character in text will actually create output: " . $_POST ["commentContent"];
} else {
echo "text contains control characters or characters that do not have any output or control function at all: " . $_POST ["commentContent"];
}
echo "<br>";
if ( ctype_alnum( $testCase ) ) {
echo "every character in text is either a letter or a digit: " . $testCase;
} else {
echo "NOT EVERY character in text is either a letter or a digit: " . $testCase;
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>My Recipe Site</title>
<link rel="stylesheet" type="text/css" href="mystyle.css">
</head>
<body>
<h3>Comments:</h3>
<form action="" method="POST">
<textarea rows="10" cols="30" name="commentContent"></textarea>
<br />
<input type="submit" value="Post!"> <br /> </form>
</body>
</html>
UPDATED: changed the echo output to clarify. The echo output now gives back the method ( ctype_print(), ctype_alnum() ) description taken from the PHP DOCS for the cases true or false