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Definition
/**
* Create a raw SQL expression (use with caution).
*
* SECURITY WARNING: This function accepts raw SQL without parameterization.
* SQL injection is possible if used with untrusted user input.
* Only use with trusted, validated input.
*
* For user-provided values, use param() instead:
* ```php
* // UNSAFE - SQL injection possible:
* raw_expr("custom_func('" . $userInput . "')")
*
* // SAFE - use parameters:
* func('custom_func', param(1))
* ```
*/
raw_expr(string $sql) : RawExpression
