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php中文网 Courses
php中文网 Courses
Apr 22, 2025 · Backend Development

Using PHP’s is_null Function to Check for Null Variables

This article explains how the PHP is_null function can be used to determine whether a variable holds a null value, demonstrates its behavior with example code, and discusses the practical implications for conditional logic in backend development.

PHPbackendis_null
0 likes · 4 min read
Using PHP’s is_null Function to Check for Null Variables
php中文网 Courses
php中文网 Courses
Feb 21, 2024 · Backend Development

Using PHP’s is_null Function to Check for Null Variables

This article explains how the PHP built‑in function is_null can be used to determine whether a variable holds a null value, demonstrates its behavior with example code, and describes the resulting true or false outcomes for different variable types.

PHPVariablesbackend development
0 likes · 4 min read
Using PHP’s is_null Function to Check for Null Variables
Laravel Tech Community
Laravel Tech Community
Jun 18, 2021 · Databases

Understanding NULL Values in Databases

This article explains the special nature of NULL in SQL, how to correctly test for NULL using IS NULL, the three‑valued logic of true/false/unknown, and the pitfalls of NOT, NOT IN, and Oracle’s handling of empty strings versus NULL.

DatabaseNULLSQL
0 likes · 6 min read
Understanding NULL Values in Databases