Answer
A callback is a function passed as an argument and executed inside another function.
Quick Answer
A callback is a function passed as an argument to another function. PHP accepts closures, arrow functions, function name strings, or array with object+method. Used with array_map(), array_filter(), usort(), etc. Callbacks let you customize behavior without changing the function. Closures can capture outer variables using the use keyword.
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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