Answer:- PHP provides various functions to read data from the file. Different functions allow you to read all file data, read data line by line, and read data character by character. PHP file read functions are given below: fread(), fgets(), fgetc()

Answer:- PHP fwrite() and fputs() functions are used to write data into file. To write data into a file, you need to use w, r+, w+, x, x+, c or c+ mode.

Answer:- The unlink() function is used to delete a file in PHP. bool unlink (string $filename)

Answer:- You should just run the PHP command line interface (CLI) and specify the file name of the script to be executed as follows.

Answer:- The move_uploaded_file() function is used to upload file in PHP. bool move_uploaded_file ( string $filename , string $destination )

Answer:- How to download file in PHP?

Answer:- The mail() function is used to send email in PHP. bool mail($to,$subject,$message,$header);

Answer:- There are two methods to connect MySQL database with PHP. Procedural and object-oriented style.

Answer:- The mysqli_connect() function is used to create a connection in PHP. resource mysqli_connect (server, username, password)

Answer:- Since PHP 4.3, mysql_reate_db() is deprecated. Now you can use the following 2 alternatives. mysqli_query() , PDO::_query()

Answer:- By default, the maximum execution time for PHP scripts is set to 30 seconds. If a script takes more than 30 seconds, PHP stops the script and returns an error. You can change the script run time by changing the max_execution_time directive in the php.ini file. When a script is called, set_time_limit function restarts the timeout counter from zero. It means, if default timer is set to 30 sec, and 20 sec is specified in function set_time_limit(), then script will run for 45 seconds. If 0sec is specified in this function, script takes unlimited time.

Answer:- There are 3 types of error in PHP. 1. Notices:These are non-critical errors. These errors are not displayed to the users. 2. Warnings:These are more serious errors, but they do not result in script termination. By default, these errors are displayed to the user. 3. Fatal Errors:These are the most critical errors. These errors may cause due to immediate termination of script.

Answer:- The exit() function is used to stop the execution of PHP script.

Answer:- CRYPT() and MD5()