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Which PHP file open mode allows you to read from a file without modifying it?

easy📝 Conceptual Q1 of 15
PHP - File Handling
Which PHP file open mode allows you to read from a file without modifying it?
A"r" - Open for reading only
B"w" - Open for writing only
C"a" - Open for appending only
D"x" - Create and open for writing
Step-by-Step Solution
Solution:

  1. Step 1: Understand the purpose of each mode

    "r" mode opens a file for reading only, without changing the file content.

  2. Step 2: Compare other modes

    "w" and "a" modes allow writing, and "x" creates a new file. Only "r" is read-only.

  3. Final Answer:

    "r" mode allows reading without modification -> Option A

  4. Quick Check:

    Read-only mode = "r" [OK]
Quick Trick: Use "r" to read files safely without changing them [OK]
Common Mistakes:
  • Confusing "r" with "w" which overwrites files
  • Using "a" expecting to read
  • Thinking "x" opens existing files

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