You want to update the 10th byte in a file without reading the whole file. Which sequence of PHP functions correctly moves the pointer and writes a character 'X' at that position?

hard📝 Application Q15 of 15

PHP - File Handling

Afopen($file, 'w'); fseek($file, 10); fwrite($file, 'X');

Bfopen($file, 'r'); rewind($file); fwrite($file, 'X');

Cfopen($file, 'r+'); fseek($file, 9); fwrite($file, 'X');

Dfopen($file, 'a'); fseek($file, 10); fwrite($file, 'X');

Step-by-Step Solution

Solution:

Step 1: Choose correct mode to read and write
Mode 'r+' opens file for reading and writing without truncating it, allowing pointer movement and writing.
Step 2: Move pointer and write
fseek($file, 9); moves pointer to 10th byte (index 9). fwrite($file, 'X'); writes 'X' at that position.
Step 3: Check other options
Mode 'w' truncates file, 'r' alone can't write, 'a' appends at end ignoring fseek.
Final Answer:
fopen($file, 'r+'); fseek($file, 9); fwrite($file, 'X'); -> Option C
Quick Check:
Use 'r+' mode and fseek before fwrite [OK]

Quick Trick: Use 'r+' mode and fseek to update file byte [OK]

Common Mistakes:

Using 'w' mode which erases file
Using 'a' mode which always appends
Not moving pointer before writing

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You want to update the 10th byte in a file without reading the whole file. Which sequence of PHP functions correctly moves the pointer and writes a character 'X' at that position?

Step 1: Choose correct mode to read and write

Step 2: Move pointer and write

Step 3: Check other options

Final Answer:

Quick Check:

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