**`fseek()`** is a built-in function in PHP. 

# Functionality

The `fseek()` function seeks a specified file. It moves the file pointer from its current position to a new position.

The new position is specified by the number of bytes and may be forward or backward, relative to the current position of the file pointer.

For example, an offset (or byte number) of 0 moves the pointer to the start of the file.

# Syntax
The following is the function prototype:

```php
fseek(file, offset, whence) 
```

# Parameters and return value

The `fseek()` function takes the following input parameters:

- **`file`**: The name of the file.
- **`offset`**: The new position, in bytes, of the file pointer.
- **`whence`**: An optional parameter that can have the values in the table below:

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The function returns 0 on success. Otherwise, it returns -1.

# Code

Edpresso: Concise shots of dev knowledge.
We are learning fseek().

<?php 

   $fp = fopen("Edpresso.txt", "r");
   fgets($fp);

   // Move to byte number 2 (p)
   echo "Output: ", fseek($fp, 2);
   echo "\n";
   echo fgetc($fp); # Read data pointed by file pointer

   fclose($fp);

?>

In the example above, we open the file *Edpresso.txt*. Next, we use `fseek()` to move to the second byte of the file.

The `fgetc()` function reads the character pointed to by the file pointer.

Finally, the character is displayed on the screen. The output for `fseek()` is `0`, demonstrating successful execution.

What is the fseek() function in PHP?

fseek() is a built-in function in PHP. Functionality The fseek() function seeks a specified file. It moves the file pointer from its current position to a new position. The new position is specified by the number of bytes and may be forward or backward, relative to the current position of the file pointer. For example, an offset (or byte number) of 0 moves the pointer to the start of the file. 

Value	Description
SEEK_SET	Sets the file pointer to the offset. Default functionality.
SEEK_CUR	Sets the file pointer to the current position plus offset.
SEEK_END	Sets the file pointer to EOF plus offset. To move to a position before EOF, offset must be negative.