Teach Yourself PHP with MySQL by Nat McBride
Author:Nat McBride [McBride, Nat]
Language: eng
Format: mobi
Publisher: Hodder Headline
Published: 2011-05-12T16:00:00+00:00
7.3 Putting it all together
Before we show the full script for this example, it’s worth a quick look at the structure using some pseudocode:
<?
// if the form has been posted, analyse it:
if ($_POST) {
foreach($_POST as $k => $v) {
$v = trim($v) ;
$$k = $v ;
}
$error = “” ;
// cleaning and validation code here...
// ...then display errors or results:
if ($error != “”) {
echo “$error <P>Please try again.” ;
} else {
echo “<P><B>Forename:</B> $forename<BR/>” ;
// etc...
}
// if the form has not been posted, display it!
} else {
?>
<FORM METHOD=”POST” ACTION=”<? echo $_SERVER[‘PHP_SELF’] ?>”>
<!— HTML to display form —>
<?
// remember to close the if... braces!
}
?>
Now for the full code listing:
<HTML>
<HEAD>
<LINK REL=”stylesheet” TYPE=”text/css” HREF=”plain.css” />
</HEAD>
<BODY>
<?
if ($_POST) {
foreach($_POST as $k => $v) {
$v = trim($v) ;
$$k = $v ;
}
// create empty error variable
$error = “” ;
// check for data in required fields
if (($forename == “”) ||
($surname == “”) ||
($email == “”)) {
$error = “Please fill in all the required fields.<BR/>” ;
}
// validate $age
if (is_numeric($age) == FALSE) {
$error = “Please enter a valid age (numbers only!)<BR/>” ;
}
// validate $email
if ((strpos($email, “@”) === FALSE) ||
(strpos($email, “.”) === FALSE) ||
(strpos($email, “ “) != FALSE) ||
(strpos($email, “@”) > strrpos($email, “.”))) {
$error .= “Please enter a valid email address<BR/>” ;
}
// clean and validate $tel
$notel = array(“+”, “ “, “(“, “)”, “[“, “]”, “-”, “,”, “#”) ;
$tel = str_replace($notel, array(“00”), $tel) ;
if (is_numeric($tel)== FALSE) {
$error .= “Please enter a valid telephone number<BR/>” ;
}
// clean $biog and add <br/>s
$biog = stripslashes($biog) ;
$biog = nl2br($biog) ;
if ($error != “”) {
echo “$error <P>Please hit the back button to try again.” ;
} else {
echo “<P><B>Forename:</B> $forename<BR/>” ;
echo “<B>Surname:</B> $surname<BR/>” ;
echo “<B>Age:</B> $age<BR/>” ;
echo “<B>Sex:</B> $sex<BR/>” ;
echo “<B>Email:</B> $email<BR/>” ;
echo “<B>Telephone:</B> $tel<BR/>” ;
echo “<B>Description:</B> $biog<BR/>” ;
}
} else {
?>
<TABLE BORDER=”0” CELLPADDING=”3” CELLSPACING=”0”>
<FORM METHOD=”POST” ACTION=”<? echo $_SERVER[‘PHP_SELF’] ?>”>
<TR>
<TD>Forename:</TD>
<TD><INPUT TYPE=”text” NAME=”forename” SIZE=”45” MAXLENGTH=”100”/></TD>
</TR><TR>
<TD>Surname:</TD>
<TD><INPUT TYPE=”text” NAME=”surname” SIZE=”45” MAXLENGTH=”100”/></TD>
</TR><TR>
<TD>Age:</TD>
<TD><INPUT TYPE=”text” NAME=”age” SIZE=”5” MAXLENGTH=”5”/></TD>
</TR><TR>
<TD>Sex:</TD>
<TD><INPUT TYPE=”radio” NAME=”sex” VALUE=”F”/>F
   <INPUT TYPE=”radio” NAME=”sex” VALUE=”M”/>M</TD>
</TR><TR>
<TD>Email:</TD>
<TD><INPUT TYPE=”text” NAME=”email” SIZE=”45” MAXLENGTH=”100”/></TD>
</TR><TR>
<TD>Telephone:</TD>
<TD><INPUT TYPE=”text” NAME=”tel” SIZE=”45” MAXLENGTH=”20”/></TD>
</TR><TR>
<TD COLSPAN=”2”>Describe yourself in a few words:</TD>
</TR><TR>
<TD COLSPAN=”2”><TEXTAREA NAME=”biog” ROWS=”4” COLS=”47”></TEXTAREA></TD>
</TR><TR>
<TD COLSPAN=”2”><INPUT TYPE=”SUBMIT” VALUE=”Send” /></TD>
</TR>
</FORM>
</TABLE>
<?
}
?>
</BODY>
</HTML>
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