Practice Real Company Assessment Patterns • Latest 2025–2026 Mock Tests

Programming Exercises

Implement a Thread-Safe Singleton Class in PHP.

Hard

Problem Statement

Implement a Thread-Safe Singleton Class in PHP.

Sample Input

Get instance twice

Sample Output

Same Instance

Limits

Time: 2s · Memory: 256 MB

Code Editor
00:00
<?php class Singleton { /* Your code here */ } ?>
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Input
Get instance twice
Expected Output
Same Instance