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PHP Recursive Functions

Recursive functions solve problems by invoking themselves on smaller subproblems. Without a base case, deep recursion can exhaust resources or recurse.

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PHP Return Types

Return type declarations constrain the values returned by functions and methods. A function declared void must not return a value, and never must not finish.

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PHP Scalar Data Types

PHP scalar types include bool, int, float and string for ordinary values. Untrusted HTTP input arrives mostly as strings; validate and convert it.

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PHP Static Local Variables

Static function-local variables retain state between successive invocations of the same function. They are function scoped, not a reliable shared persistent cache across.

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