- PHP Tutorial
- PHP Syntax
- PHP Variables
- PHP Data Types
- PHP Constants
- PHP Operators
- PHP if elseif else statements
- PHP Switch Statement
- Arrays in PHP
- Loops in PHP
- Strings in PHP
- GET and POST in PHP
- Functions in PHP
- Cookies in PHP
- Sessions in PHP
- Include and Require in PHP
- File Opening and Reading in PHP
- File Creation and Writing in PHP
- Form Validation in PHP
- Date and Time Functions in PHP
- Validation and Sanitizing Data Via PHP Filters
- Introduction to Object Oriented Programming in PHP
- Parameterized Constructors in PHP
- Inheritance in Object Oriented PHP
- Abstract Class in PHP
- Math Functions in PHP
- Error and Exception Handling in PHP
- Reading XML data in PHP
- Reading XML Nodes/Attributes Values in PHP
- XML DOM Parser
- Sorting Arrays in PHP
- Commonly Used Array Functions in PHP
- Commonly Used String Functions in PHP
- Access Modifiers in PHP
- Variable Examination Functions in PHP
- File Upload in PHP
- PHP and AJAX
- PHP Frameworks
- Connecting PHP to MySQL
- Create Database in MySQL via PHP Script
- Drop Database in MySQL via PHP Script
- Selecting Mysql Database via PHP Script
- Create Table in MySQL via PHP Script
- Drop Table in MySQL
- Inserting Data in MySQL Table via PHP Script
- Selecting MySQL Table Data via PHP Script
- Where Clause in MySQL
- Update MySQL Table data via PHP Script
- Deleting Data From MySQL Table via PHP Script
- Sorting MySQL table data via PHP Script
- LIKE Query in MySQL
- Select Unique Data via Distinct In MySQL
- IN Operator in MySQL
- Using BETWEEN operator in MySQL
- AND/OR Operators In MySQL
- Selecting Limited records via LIMIT in MySQL
- Max and Min Functions in MySQL
- SUM and AVG Functions in MySQL
- Using COUNT Function in MySQL
- UCASE and LCASE Functions in MySQL
- GROUP BY and HAVING Clauses in MySQL
- INSERT INTO SELECT in MySQL
- DEFAULT Statement in MySQL
- Implementing Check on Table Columns
- INNER JOIN in MySQL
- LEFT JOIN in MySQL
- RIGHT JOIN In MySQL
- Implementing FULL Join in MySQL
File Opening and Reading in PHP
File handling is one of the most important task in any software project. Reading data from the files and writing data to the files are two of the most critical file handling tasks. In this article, the process of opening and reading a file has been explained.
Create a file named “textdoc.txt” and add the following lines of text in that file.
- Welcome to PHP tutorials.
- This website is awesome.
- It has amazing tutorials.
- I really like it.
Now to read the above text file the fopen and fread functions are used. Have a look at the following piece of code to grasp this concept.
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In the above code, fopen function is being used to read the file. The first parameter to the fopen function is the file to read and the second parameter is the permission. Here ‘r’ stands for read only permission. In the code, if the file doesn’t exist or if we are somehow unable to open it, the scrip shall die and an appropriate message shall be sent to the client. Next, fread function is being used to read the file. The first parameter is the handler to the file and the second parameter is the size of the file. Finally after reading the file, it is being closed using fclose function.
Reading file contents line by line.
In the above code, all of the file content is being read at once and displayed on the webpage. This content can also be read line by line as shown in the following example.
"; } fclose($filetoopen); ?>
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In the above code the fgets function is used to read the text document line by line. After each line is read it is checked whether the document has reached its end or not via feof function.