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boolean check

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php中文网 Courses

Mar 27, 2025 · Backend Development

Using PHP's is_bool() Function to Check Boolean Variables

This article explains how the PHP is_bool() function determines whether a variable holds a boolean value, provides a complete code example with four different variables, shows the resulting output, and discusses why only true and false are recognized as booleans.

Backend DevelopmentCode ExamplePHP

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Using PHP's is_bool() Function to Check Boolean Variables

php中文网 Courses

May 7, 2024 · Backend Development

Using PHP’s is_bool() Function to Check Boolean Variables

This article explains how PHP’s built‑in is_bool() function determines whether a variable is a boolean, demonstrates its usage with four sample variables of different types, shows the resulting output, and highlights why only true and false values are recognized as booleans.

Code ExamplePHPVariables

0 likes · 4 min read