PHP programming daily must-learn form validation, PHP programming Form _php Tutorial

PHP programming daily must-learn form validation, PHP programming form

This article explains the implementation of PHP form verification, share to everyone for reference, the specific content as follows

1.PHP form Processing
Welcome.html

welcome.php

 
  Welcome <?php echo $_post["name"];?>
Your Email address is: <?php echo $_post["email"];?>

2.PHP Form Validation Complete instance

 <?php//defines the variable and sets it to a null value $nameerr = $EMAILERR = $WEBSITEERR = ""; $name = $email = $website = ""; if ($_server["Request_method"  ] = = "POST") {if (Empty ($_post["name")) {$NAMEERR = "name is required";   } else {$name = Test_input ($_post["name"]);   Checks whether the name contains letters and whitespace characters the//preg_match () function retrieves the pattern of the string, or returns True if the pattern exists, otherwise false.    if (!preg_match ("/^[a-za-z]*$/", $name)) {$NAMEERR = "only allow letters and spaces";  }} if (Empty ($_post["email")) {$EMAILERR = "e-mail is required";   } else {$email = Test_input ($_post["email"]); Check that the e-mail address syntax is valid if (!preg_match ("/"/([\w\-]+\@[\w\-]+\.[    \w\-]+)/", $email)) {$EMAILERR =" Invalid email format ";  }} if (Empty ($_post["website")) {$website = "";   } else {$website = Test_input ($_post["website"]); Check that the URL address syntax is valid (the regular expression also allows a slash in the URL) if (!preg_match ("/\b" (?:(?: https?| FTP): \/\/|www\.) [-a-z0-9+&@#\/%?=~_|!:,.;] *[-a-z0-9+&@#\/%=~_|]    /i ", $website)) {$WEBSITEERR =" Invalid URL "; }}}function Test_input ($data) {//Remove unnecessary characters from user input data (extra spaces, tabs, line breaks) $data = TriM ($data);  Remove the backslash (\) $data = Stripslashes ($data) in the user input data;  Converts a special character to an HTML entity $data = Htmlspecialchars ($data); return $data;}? >
PHP Validation Example
* Required Fields

 <?phpecho "
Your input:
"Echo $name; echo"
"Echo $email; echo"
"Echo $website; echo"
";? >

I hope this article will help you learn PHP programming.

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