[Solved] Why is it important to call session_start() before any HTML output in PHP? — Ans: Because session_start() sends HTTP headers which must be sent before output. | PHP

PHP - Sessions and Cookies

Why is it important to call session_start() before any HTML output in PHP?

ABecause session_start() caches the HTML output.

BBecause session_start() generates HTML content.

CBecause session_start() encrypts the page content.

DBecause session_start() sends HTTP headers which must be sent before output.

Step-by-Step Solution

Solution:

Step 1: Understand HTTP headers and output order
PHP sessions use cookies sent via HTTP headers, which must be sent before any HTML output.
Step 2: Analyze other options
Session_start() does not generate HTML, encrypt content, or cache output.
Final Answer:
Because session_start() sends HTTP headers which must be sent before output. -> Option D
Quick Check:
session_start() must run before output to send headers [OK]

Quick Trick: Call session_start() before any echo or HTML output [OK]

Common Mistakes:

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