Tag: php
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Most referenced — #php
ereg() / eregi() — POSIX Regex Removed in PHP 7 2Abstract Classes 1Exception Hierarchy & Custom Exceptions 1Division by Zero & DivisionByZeroError 1readonly Properties (PHP 8.1) 1readonly Classes (PHP 8.2) 1Object Cloning & Security Implications 1Late Static Binding — PHP 5.3 Feature 1
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Regex Branch Reset Groups
A PCRE-specific construct (?|...) that resets capture group numbers across each alternative, so all branches share the same group indices.
1w ago
regex advanced
Memory Pressure Detection PHP 7.0+
Proactively identifying when a PHP process approaches its memory limit so corrective action can be taken before a fatal error.
1w ago
performance intermediate
HTTP Cookies in PHP PHP 7.3+
Cookies are small key-value pairs sent by the server via Set-Cookie and echoed back by the browser on every request — PHP sets them with setcookie() before any output, with Secure, HttpOnly, and SameSite flags controlling safety.
1mo ago
php beginner
Insecure Deserialization
Deserializing attacker-controlled data can trigger arbitrary object construction and method calls — PHP's unserialize() with untrusted input enables remote code execution via gadget chains in the loaded class graph.
CWE-502 OWASP A8:2021
1mo ago
security advanced
INSERT ... ON DUPLICATE KEY UPDATE PHP 5.1+
An atomic MySQL upsert — inserts a new row or updates the existing one if a unique key constraint would be violated.
2mo ago
database intermediate
Mutex vs Semaphore PHP 7.0+
A mutex allows only one thread to access a resource at a time — a semaphore controls access to a pool of N identical resources.
CWE-362
2mo ago
concurrency advanced
MySQL charset=utf8mb4 PHP 5.1+
The correct MySQL character set for full Unicode support — including emoji and supplementary characters that the older utf8 charset cannot store.
2mo ago
php beginner
MySQL Connection Pooling PHP 5.1+
Reusing database connections across requests instead of opening and closing a new connection on every request.
2mo ago
php intermediate
MySQL DSN (Data Source Name) PHP 5.1+
The connection string passed to PDO specifying the database driver, host, port, database name, and charset.
2mo ago
php beginner
N+1 Query Problem PHP 5.1+ A performance anti-pattern where fetching N records triggers N additional queries — one per record — instead of a single JOIN.
2mo ago
database intermediate
PDO Error Handling PHP 5.1+
PDO has three error modes — silent, warning, and exception — controlling how database errors surface.
2mo ago
php beginner
PDO Fetch Modes PHP 5.1+
Constants controlling how PDO returns rows — as arrays, objects, or custom classes.
2mo ago
php beginner
PDO lastInsertId() PHP 5.1+
Returns the auto-increment ID generated by the most recent INSERT statement.
2mo ago
php beginner
PDO Named Placeholders PHP 5.1+
Named parameters (:name) in prepared statements — more readable than positional ? placeholders for queries with multiple parameters.
2mo ago
php beginner
PDO query() vs prepare() PHP 5.1+
PDO query() executes raw SQL immediately — prepare() parameterises it. query() must never include user-controlled values.
CWE-89 OWASP A3:2021
2mo ago
php beginner
9.8
PDO Transactions PHP 5.1+ PDO wraps multiple queries in an atomic unit — either all succeed or all roll back.
2mo ago
php intermediate
PDO::ATTR_EMULATE_PREPARES PHP 5.1+
Controls whether PDO sends real prepared statements to the database or emulates them client-side in PHP.
CWE-89 OWASP A3:2021
2mo ago
php intermediate
PDOStatement::bindParam() vs bindValue() PHP 5.1+
Two PDO methods for binding variables to placeholders — bindParam() binds by reference (evaluated at execute), bindValue() binds by value (evaluated immediately).
2mo ago
php intermediate
PDOStatement::rowCount() PHP 5.1+
Returns the number of rows affected by the last DELETE, INSERT, or UPDATE — unreliable for SELECT.
2mo ago
php beginner
PHP Generators PHP 5.5+
Functions using yield that produce values lazily — one at a time — instead of building a complete array in memory.
2mo ago
php intermediate