PHP Lecture 1 - String, Constants, Arrays, Operators
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PHP is a server-side scripting language that allows developers to work with strings, constants, operators, arrays, and superglobals. It presents an overview of PHP string functions like str_word_count() and strrev(), how to define constants, the different types of operators in PHP like assignment, comparison, and arithmetic, the three types of arrays, and array functions for sorting. The document also lists the PHP superglobal variables that provide information about headers, files, environment variables, cookies, and more.
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Proactive Vulnerability Detection in Source Code Using Graph Neural Networks:...Ranjan Baisak As software complexity grows, traditional static analysis tools struggle to detect vulnerabilities with both precision and context—often triggering high false positive rates and developer fatigue. This article explores how Graph Neural Networks (GNNs), when applied to source code representations like Abstract Syntax Trees (ASTs), Control Flow Graphs (CFGs), and Data Flow Graphs (DFGs), can revolutionize vulnerability detection. We break down how GNNs model code semantics more effectively than flat token sequences, and how techniques like attention mechanisms, hybrid graph construction, and feedback loops significantly reduce false positives. With insights from real-world datasets and recent research, this guide shows how to build more reliable, proactive, and interpretable vulnerability detection systems using GNNs.
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We often trust them with the safety of our codebase, but how do we know that we should? How do we know that this trust is well-deserved?
Enter mutation testing – by intentionally injecting harmful mutations into our code and seeing if they are caught by the tests, we can evaluate the quality of the safety net they provide. By watching the watchmen, we can make sure our tests really protect us, and we aren’t just green-washing our IDEs to a false sense of security.
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PHP Lecture 1 - String, Constants, Arrays, Operators
- 4. String str_word_count("Hello world!")2 strrev("Hello world!")3 str_replace("world", "Dolly", "Hello world!")4 strpos("Hello world!", "world")5 strlen("Hello world!")1
- 6. Operators Assignment operators2 Comparison operators3 Increment/Decrement operators4 Logical operators5 Arithmetic operators1 String operators6
- 12. String operators
- 13. Array • Indexed arrays - Arrays with a numeric index • Associative arrays - Arrays with named keys • Multidimensional arrays - Arrays containing one or more arrays
- 14. Array function • sort() - sort arrays in ascending order • rsort() - sort arrays in descending order • asort() - sort associative arrays in ascending order, according to the value • ksort() - sort associative arrays in ascending order, according to the key • arsort() - sort associative arrays in descending order, according to the value • krsort() - sort associative arrays in descending order, according to the key
- 15. Superglobals • $GLOBALS • $_SERVER • $_REQUEST • $_POST • $_GET • $_FILES • $_ENV • $_COOKIE • $_SESSION
- 16. QUESTION ?
- 17. THANK YOU