Terms starting with "Z"
Zend Engine Versions — 1 Through 4
The Zend Engine is the virtual machine that compiles and executes PHP code. Version 1 (PHP 3) introduced the modern parser; v2 (PHP 5) added OOP; v3 (PHP 7) doubled performance; v4 (PHP 8) added JIT compilation.
6mo ago
PHP intermediate
Zero Downtime Deployment
PHP 5.0+
1
Deploying new application code without dropping a single request — using rolling updates, blue/green swaps, or atomic symlink switches.
6mo ago
DevOps intermediate
Zero Trust
PHP 5.0+
2
Never trust, always verify — authenticate and authorise every request regardless of network location.
6mo ago
General intermediate
Zero-Day Vulnerability
3
A security flaw unknown to the vendor with no available patch — attackers may have exploits in the wild before defenders can respond.
6mo ago
Security intermediate
Zip Slip
PHP 5.0+
3
A path traversal attack via crafted archive filenames (e.g. ../../evil.php) that escape the extraction directory during unzip.
CWE-22 OWASP A1:2021
6mo ago
Security intermediate
8.1