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SplFileObject::fscanf is a method in PHP's SplFileObject class that is used to read formatted input from a file. It takes a format string as an argument and reads data from the file according to that format.

The format string passed to SplFileObject::fscanf is similar to the format strings used in the C programming language's scanf function. It consists of format specifiers that define the expected data types and formats of the input.

For example, consider the following code:

php
$file = new SplFileObject('data.txt');
$file->fscanf('%s %d', $name, $age);

echo "Name: $name, Age: $age";


In this example, the code reads the first string (format specifier '%s') and the following integer (format specifier '%d') from the file 'data.txt'. The values are stored in the variables $name and $age, respectively. Finally, it prints out the values.

The '%s' format specifier is used for reading a string, and the '%d' format specifier is used for reading an integer. Other format specifiers are available for different data types.

It's important to note that SplFileObject::fscanf returns the number of successfully matched and assigned input items. It can be used to check if the input was read successfully.

I hope this clarifies how to use SplFileObject::fscanf in PHP. Let me know if you have any further questions!