What are the drawbacks of using wildcards in SQL queries to search for specific values within concatenated data in PHP?

Using wildcards in SQL queries to search for specific values within concatenated data can lead to performance issues and potential SQL injection vulnerabilities. To solve this issue, it is recommended to use parameterized queries with placeholders instead of concatenating user input directly into the SQL query. 

// Example of using parameterized queries to search for specific values within concatenated data
$searchTerm = "%example%";
$stmt = $pdo->prepare("SELECT * FROM table WHERE column LIKE ?");
$stmt->execute([$searchTerm]);
$results = $stmt->fetchAll();

Keywords

wildcards SQL queries concatenated data drawbacks PHP

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