First introduction to PHP, first introduction to educational technology_PHP tutorial

First introduction to PHP, first introduction to educational technology

1. In PHP, global variables must be capitalized;

2. In the PHP form submission method, the method attribute sets the method of obtaining and submitting data;

3. If the upload element is used in the form, then add attributes to the form: enctype="multipart/form-data";

4. Implementation of user logout function:

Copy code The code is as follows:

session_start(); //Start session
​​​ unset($_SESSION['user']); //Delete a single session
​​  unset($_SESSION['pwd']); ​ //Delete a single session
session_destory(); //End the current reply
       header("location:index.php"); //Redirect
?>

Delete multiple sessions: $_SESSION=array();

Traversing objects in 5.php:

Copy code The code is as follows:

for（$i=0;$i //Processing
}

6.php contains files: include("file path");

7. How to embed js script in HTML page:

Copy code The code is as follows:

8. Reference JS files in php dynamic pages:

Copy code The code is as follows:

Or:

9. Solve the problem that the browser does not support JavaScript:
a. Enable JavaScript support in IE browser;
b. Enable IE browser’s support for local JavaScript;
c. Use comment symbols to verify whether the browser supports JavaScript script function;
d. Use the tag to verify whether the browser supports JavaScript scripts.

10. In php, the processing mechanisms of single quotes and double quotes are different. Their differences:
The contents of double quotes can be interpreted and replaced, while the contents of single quotes are treated as ordinary characters. Such as:

Copy code The code is as follows:

$test="PHP";
        $str1="I like $test";
$str2='I like $test';
echo $str; //Output: I like PHP;
echo $str; //Output: I like $test;
?>

I am new to PHP and don’t know much about user registration and login. I hope you guys can give me some advice... (it’s best to have an example) haha

condb.php
$con = mysql_connect("localhost","root","123456");
if (!$con) {
die("Query is failed :" . mysql_error());
}
mysql_select_db("login_schema");

mysql_query("set names 'utf8'");
?>
login.php
session_start();
if (isset($_SESSION['errorMsg']) && $_SESSION['errorStatic'] == 1){
echo "" . $_SESSION['errorMsg'] . "";
}else{
unset($_SESSION['errorStatic']);
}
?>

User Login
username  :
password  :
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