Why does str_replace() return the modified string instead of changing the original string variable directly?

hard📝 Conceptual Q10 of 15

PHP - String Functions

ABecause strings in PHP are immutable and functions return new strings

BBecause str_replace() modifies the original string by reference

CBecause PHP does not support string replacement

DBecause str_replace() only works on arrays

Step-by-Step Solution

Solution:

Step 1: Understand PHP string behavior
Strings in PHP are immutable, meaning they cannot be changed after creation.
Step 2: Explain function return behavior
Functions like str_replace() return a new string with replacements; original string stays unchanged unless reassigned.
Final Answer:
Because strings in PHP are immutable and functions return new strings -> Option A
Quick Check:
Immutable strings = return new string [OK]

Quick Trick: Assign str_replace() result to variable to keep changes [OK]

Common Mistakes:

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