Answer
header() sends raw HTTP headers for redirects, JSON output, or content-type changes and must run before output.
Quick Answer
header() sends raw HTTP headers to the browser. Must be called before any output. Used for: redirects (Location header), setting content type (Content-Type: application/json), caching headers (Cache-Control), file download prompts (Content-Disposition). Always call exit after a redirect header to stop script execution immediately.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ