PHP Form Handling

Get Form Data

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$_GET["field"]
$_POST["field"]

Validation

Not empty

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if (empty($_POST["field"])) {
  $err = "Field is required";
}

Letters and white space only

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if (!preg_match("/^[a-zA-Z ]*$/",$field)) {
  $err = "Only letters and white space allowed"; 
}

E-mail address

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if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
  $err = "Invalid email format"; 
}

Url

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if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$url)) {
  $err = "Invalid URL"; 
}