![]() ![]() If $id is replaced with " ' DELETE FROM Table SELECT * FROM Table WHERE id = ' ", executing this query will wipe out all the data in Table. Query = " SELECT x, y, z FROM Table WHERE id = '$id' " If user input data is improperly escaped or filtered, the system will be exposed to SQL injection, script injection, XML external entity (XXE) injection, and cross-site scripting (XSS) attacks. String interpolation, like string concatenation, may lead to security problems. The split string can be cached for reuse. Split and join string: splitting the string into an array, merging it with the corresponding array of values, then joining items by concatenation. ![]() Find variable reference (placeholder), replace it by its variable value. Replace and expand placeholders: creating a new string from the original one, by find–replace operations.There are two main types of variable-expanding algorithms for variable interpolation: String interpolation is common in many programming languages which make heavy use of string representations of data, such as Apache Groovy, Julia, Kotlin, Perl, PHP, Python, Ruby, Scala, Swift, Tcl and most Unix shells. Some languages do not offer string interpolation, instead using concatenation, simple formatting functions, or template libraries. Language support for string interpolation varies widely. Expansion of the string usually occurs at run time.
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