PHP basic example: Use regular expressions to modify configuration information, example regular expression_PHP tutorial

PHP basic example: use regular expressions to modify configuration information, example regular expressions

Principle diagram of each PHP working:

The following is the code time:

php //Profile information define("HOST","localhost"); //Host name define("USER","rootaaaa"); //Username define("PASSWORD","root123456"); //Password define("DBNAME","mydb"); //Database name dbconfig.php php //Perform configuration file modification operations //1. Read configuration file information $info = file_get_contents("dbconfig.php"); //2. Traverse the POST and perform regular replacement of the configuration file information foreach($_POST as $k => $v) { $info=preg_replace("/define("{$k}","(.*?)")/","define ("{$k}","{$v}")",$info); } //3. Write the replaced information back to the configuration file file_put_contents("dbconfig.php",$info); echo "

Modification successful!

"; echo "return"; doupdate.php php //Edit configuration file $keyinfo=array("HOST"=>"Host","USER"=>"User","PASSWORD"=>"Password","DBNAME" =>"Database name"); //1. Read configuration file information $info = file_get_contents("dbconfig.php");//Read the information in the dbconfig.php file and assign it to the info variable //2. Use regular expressions to parse configuration file information preg_match_all("/define("(.*?)","(.*?)")/",$info,$a); //Parse the information in info into a variable and store it //3. Traverse the parsed information and output it to the modification form echo "

Edit configuration file

"; echo "

"; foreach($a[1] as $k =>$v) { echo "{$keyinfo[$v]}:

" ; } echo " "; echo ""; echo "

"; edit.php