Rule `constant_case`¶

The PHP constants true, false, and null MUST be written using the correct casing.

Configuration¶

Whether to use the upper or lower case syntax.

Allowed values: 'lower', 'upper'

Default value: 'lower'

Default configuration.

--- Original
+++ New
 <?php
-$a = FALSE;
-$b = True;
-$c = nuLL;
+$a = false;
+$b = true;
+$c = null;

With configuration: ['case' => 'upper'].

--- Original
+++ New
 <?php
 $a = FALSE;
-$b = True;
-$c = nuLL;
+$b = TRUE;
+$c = NULL;

The rule is part of the following rule sets:

@PER: Using the @PER rule set will enable the constant_case rule with the default config.
@PSR2: Using the @PSR2 rule set will enable the constant_case rule with the default config.
@PSR12: Using the @PSR12 rule set will enable the constant_case rule with the default config.
@PhpCsFixer: Using the @PhpCsFixer rule set will enable the constant_case rule with the default config.
@Symfony: Using the @Symfony rule set will enable the constant_case rule with the default config.