Reading files (fread, fgets, file) in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the fread function do in PHP?

fread reads a specified number of bytes from an open file pointer. It is useful for reading large files in chunks.

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How does fgets differ from fread?

fgets reads a single line from a file pointer, stopping at a newline or the specified length, while fread reads a fixed number of bytes regardless of lines.

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What is the purpose of the file function in PHP?

The file function reads an entire file into an array, where each element is a line from the file. It is a quick way to get all lines at once.

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What must you do before using fread or fgets?

You must first open the file using fopen to get a file pointer resource.

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Why should you always close a file after reading it?

Closing a file with fclose frees system resources and avoids potential file locks or memory leaks.

Which function reads a whole file into an array, with each line as an element?

A fread()

B file()

C fgets()

D fopen()

file() reads the entire file into an array of lines.

What does fgets() read from a file?

A A single line

B The entire file

C A fixed number of bytes

D File metadata

fgets() reads one line at a time from a file pointer.

Before using fread(), what must you do?

A Close the file

B Nothing, just call <code>fread()</code>

C Use <code>file()</code>

D Open the file with <code>fopen()</code>

You must open the file first with fopen() to get a file pointer.

What is the main reason to call fclose() after reading a file?

A To write to the file

B To read the file again

C To free system resources

D To rename the file

fclose() frees system resources and closes the file properly.

Which function reads a specific number of bytes from a file?

A fread()

B file()

C fopen()

D fgets()

fread() reads a set number of bytes from a file pointer.

Explain how to read a file line by line in PHP using fgets.

Think about opening the file, reading lines until no more lines, then closing.

Describe the difference between fread and file functions for reading files.

Consider how much data each reads and how they return it.