Answer
include gives a warning on failure; require stops execution with a fatal error.
Quick Answer
include: shows warning if file not found, script continues. require: shows fatal error if file not found, script stops. Use require for files that are essential (DB config, core functions) - the app can't run without them. Use include for optional files. Both have _once variants that prevent re-including the same file: require_once and include_once.
S
SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ