IIS+PHP mysql undefined function mysql_connect()_PHP教程

IIS+PHP cannot load MYSQL undefined function mysql tutorial_connect()
In many php tutorials, beginners will get an undefined function mysql_connect() error message when they first php mysql. Let's analyze the reasons below.

1.
Remove the ";" in front of the following parameters in PHP.ini:
;extension=php_dba.dll
;extension=php_gd2.dll
;extension=php_mbstring.dll
;extension=php_mcrypt.dll
;extension=php_mysql.dll
;extension=php_mysqli.dll
;extension=php_pdo.dll
;extension=php_pdo_mysql.dll
Save the file and restart IIS

Specific instructions

Put
in php.ini ;extension=php_mysql.dll
Change to
extension=php_mysql.dll

extension_dir = " "
Change to
extension_dir = "ext/ "

Copy libmysql.dll to system32 and finally restart it

Test whether php mysql can connect

$link=mysql_connect( 'localhost ', 'root ', '123456 ');
if(!$link) echo "fail ";
else echo "success ";
mysql_close();
?>

2.

1.php_info() Check if there is a mysql item (search for the "mysql" keyword). If it is possible, it may be a version compatibility issue
2. If the libmysql.dll in the php file is not copied to x:windowssystem32, remove the comment of the mysql module in php.ini with extension=php_mysql.dll. Restart apache. If it still doesn’t work, restart the machine and try to test using the php_info() function. test.

Right click on My Computer->Properties->Advanced->Environment Variables->System Environment Variables
a. Select Path in "System Environment Variables" to highlight this line, then select "Edit" and add ";D:php" (the directory where php.exe is located) at the end of the variable value
b. "System environment variables"->"New"->Variable name "PHPRC"->Variable value "D:php" (the directory where php.ini is located)->
2. Check the PhpIniDir setting in the httpd.conf file to point to the Php directory.
3. Try to change PhpIniDir="C:/Php" in httpd.conf to PhpIniDir="C:Php".

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