01 Print & Echo (Display a text)
This is Print Text method 1
This is print text method 2
This is an Echo Text.
// print method 1
print("This is Print Text method 1");
echo "<br>"; echo "<br>";
// print method 1
$text = "This is print text method 2";
print ($text);
// echo text
echo "<br>"; echo "<br>";
echo "This is an Echo Text";
echo "<br>";echo "<br>";
02 Comments
#line comment
// inline comment
/* multi
line
commnt */
03 If clause
if (6>2){
echo "True <br>";
}
else{
echo "False <br>";
}
echo "<br>";
Output = True
04 Concatention
$d = 11;
$m = 'April';
$y = 2020;
echo "Today is ". $d . $m . $y;
echo "<br>";
Output = Today is 11 April 2020
05 Operaters
$x = 10;
$y = 2;
echo $x + $y;
echo "<br>";
echo $x - $y;
echo "<br>";
echo $x * $y;
echo "<br>";
echo $x / $y;
Output = 12
8
20
5
06 PHP Complete Form
First name:
Last name:
E-mail:
Website:
Comment:
Gender:
<?php
// define variables and set to empty values
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["name"])) {
$nameErr = "Name is required";
} else {
$name = test_input($_POST["name"]);
// check if name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameErr = "Only letters and white space allowed";
}
}
if (empty($_POST["email"])) {
$emailErr = "Email is required";
} else {
$email = test_input($_POST["email"]);
// check if e-mail address is well-formed
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$emailErr = "Invalid email format";
}
}
if (empty($_POST["website"])) {
$website = "";
} else {
$website = test_input($_POST["website"]);
// check if URL address syntax is valid
//(this regular expression also allows dashes in the URL)
if
(!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)
[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
$websiteErr = "Invalid URL";
}
}
if (empty($_POST["comment"])) {
$comment = "";
} else {
$comment = test_input($_POST["comment"]);
}
if (empty($_POST["gender"])) {
$genderErr = "Gender is required";
} else {
$gender = test_input($_POST["gender"]);
}
}
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>
<form method="post" action="
<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
First Name:<br> <input type="text" name="name" value="
<?php echo $name; ?>">
<span <?php echo $nameErr;?></span>
<br><br>
Last Name:<br> <input type="text" name="name" value="
<?php echo $name; ?>">
<span <?php echo $nameErr;?></span>
<br><br>
E-mail:<br> <input type="text" name="email" value="
<?php echo $email; ?>">
<span <?php echo $emailErr;?></span>
<br><br>
Website:<br> <input type="text" name="website" value="
<?php echo $website; ?>">
<span <?php echo $websiteErr;?></span>
<br><br>
Comment:<br> <textarea name="comment" rows="5" cols="40">Any Comments...?
<?php echo $comment;?> </textarea>
<br><br>
Gender: <br>
<input type="radio" name="gender" <?php
if (isset($gender) && $gender=="female")
echo "checked"; ?> value="female">Female <br>
<input type="radio" name="gender" <?php
if (isset($gender) && $gender=="male")
echo "checked"; ?> value="male">Male <br>
<input type="radio" name="gender" <?php
if (isset($gender) && $gender=="other")
echo "checked"; ?> value="other">Other <br>
<br><br>
<input type="submit" name="submit" value="Submit">
</form>
<?php
echo "<hr>";
echo $name;
echo "<br><br>";
echo $email;
echo "<br><br>";
echo $website;
echo "<br><br>";
echo $comment;
echo "<br><br>";
echo $gender;
?>
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