Code style

'Closure::fromCallable()' can be converted to the first-class callable syntax: Reports the callable creation expressions that use Closure::fromCallable but can be replaced with first-class callable syntax f(...) available since PHP 8.1.
'array_fill' can be converted to loop: Reports the array_fill() calls that can be replaced with foreach loops.
'array_filter()' call can be converted to loop: Reports the array_filter() calls that can be replaced with foreach loops.
'array_map()' call can be converted to loop: Reports the array_map() calls that can be replaced with foreach loops.
'get_class()' call can be replaced with '::class': Reports the get_class() calls and suggests replacing them with ::class when PHP Language level is set to 8.0 or later.
'if' can be replaced with 'match' expression: Reports the if statements inside if-elseif-else constructs that use strict comparisons (===) and could be replaced with match expressions.
'instanceof' checks in 'catch' block can be replaced with specific catches: Reports the instanceof checks in single catch blocks that could be replaced with multiple catch blocks specific for each exception instance.
'isset' can be replaced with coalesce: Reports the conditions using isset that can be safely replaced with expressions using the ?? null coalesce operator.
'isset' can check nested array access and sub properties directly: Reports constructions like isset($a['a']) && isset($a['a']['b']) && isset($b) && isset($b->b) that can be replaced with isset($a['a']['b']) && isset($b->b).
'json_decode()' and 'json_last_error()' can be converted to 'json_validate()': In PHP 8.3 and later, suggests converting `json_decode()` and `json_last_error() === JSON_ERROR_NONE` to `json_validate()`.
'match' can be replaced with 'switch' statement: Reports the match expressions that can be replaced with switch statements.
'match' expression can be replace with ternary expression: Reports the match expressions containing a default arm and a single non-default arm.
'mixed' return type can be narrowed: Reports 'mixed' return types that can be narrowed down to more concrete types.
'mixed' type can be replaced with 'array': Reports the mixed[] usages in PHPDoc blocks that can be safely replaced with array.
'pow()' call can be replaced with '**' operator: Reports the pow() calls that can be replaced with the ** operator, which adds no overhead of calling a function.
'readonly' modifier is redundant: Reports readonly modifiers applied to properties in read-only classes.
'str*()' calls can be replaced with PHP 8 'str_*()' calls: Reports the strpos and substr functions calls that can be replaced with the str_* functions calls (introduced in PHP 8.0).
'switch' can be replaced with 'match' expression: Reports 'switch' statements that could be replaced with 'match' expression.
Automatic conversion of 'false' to array is deprecated: Reports automatic conversions of false values to arrays.
Case mismatch in method call or class usage: Reports the usages of functions, methods, classes, and namespaces that do not match the case used in their declarations.
Class can be 'readonly': Reports classes which contain only readonly properties.
Class constant can be 'final': Reports the non-final class constants that are not redefined in child classes.
Class path doesn't match project structure: Reports the classes with the filepath not following the PSR-0/PSR-4 project structure.
Closure can be converted to arrow function: Reports the anonymous functions that can be transformed to short arrow functions.
Comment can be replaced with named argument: Reports the inline comments before arguments in function calls that only contain the name of the parameter and thus serve as hints.
Control statement body without braces: Reports the control structures (such as loops or conditionals) whose bodies are not enclosed in braces.
Dangerous array initialization: Reports dangerous array initializations (such as $arr[] = value).
Define constant name can be replaced with 'const' syntax: Reports the define() calls that can be replaced with const syntax.
Expression without clarifying parentheses: Reports potentially ambiguous expressions and proposes enclosing them in clarifying parentheses.
Fully qualified name usage: Reports the fully qualified class names that can be shortened by adding the use statement.
Implicit octal literal can be replaced with explicit one: Reports the implicit octal literals such as 071 that could be replaced with explicit ones such as 0o71.
Loop can be converted to 'array_fill()' call: Reports the for loops that can be replaced with array_fill() calls.
Loop can be converted to 'array_filter()' call: Reports the foreach loops that can be replaced with array_filter() calls.
Loop can be converted to 'array_map()' call: Reports the foreach loops that can be replaced with array_map() calls.
Method can be made 'static': Reports the methods that don't use any instance references and thus may be converted to static methods.
Multiple 'isset' calls can be replaced with one: Reports multiple isset() checks that can be replaced with a single one.
Multiple classes declarations in one file: Reports multiple class declarations in a single file, which violates the PSR-0/PSR-4 standards.
Named arguments order does not match parameters order: Reports named argument with order that does not match parameter order.
Nullsafe operator '?->' can be used: Reports the null-checking conditional expressions that can be safely replaced with the ?-> nullsafe operator.
Old style constructor: Reports old-style constructor declarations (ClassName()) and suggests replacing them with new-style constructors (__construct()).
Open 'echo' tag usage: Reports the <?php echo usages that can be replaced with a short tag <?=.
Redundant closing tag: Reports PHP closing tag ?> usages, which are redundant in files containing only PHP code.
Short open 'echo' tag usage: Reports short PHP echo tag <?= usages.
Short open tag usage: Reports short PHP opening tag <? usages.
Single-statement body with braces: Reports the control structures (such as loops or conditionals) whose bodies are enclosed in braces but only contain a single child statement.
Traditional syntax array literal detected: Reports traditional array syntax (array()) usages in array literals and suggests replacing them with short array syntax ([]).
Trait usage is not allowed: Reports the class references that are resolved to traits but are specified outside use statements.
Trait use rule resolved to method with different containing class: Reports the trait method use rules that are resolved to methods from a different containing class rather than the one specified in the use declaration.
Type cast is unnecessary: Reports the type cast operators used on the values that are already of the corresponding type.
Type cast on a scalar value: Reports the type casts that can be evaluated in place and suggests replacing them with actual computed values.
Type hint 'array|Traversable' can be replaced with 'iterable': Reports the array|Traversable type hints that can be replaced with iterable.
Unnecessary curly braces syntax for variable: Reports unnecessary { and } used for interpolating variables in string literals.
Unnecessary double quotes: Reports double-quoted string literals that do not contain string interpolation, escape sequences, or single quotes.
Unnecessary fully qualified name: Reports the usages of fully qualified class names, which can be shortened without adding the use statement.
Unnecessary leading '\' in 'use' statement: Reports the use statements with an unnecessary leading \.
Unnecessary parentheses: Reports the expressions containing redundant parenthesis, which can be safely removed.
Usage of a variable variable: Reports the usages of variable variables (dynamic variable names such as $$a).
Variable is only used inside closure: Reports variables in closures' use list that are only used inside closure.
PSR-12: Sub-group of 8 inspections that provide checks for PSR-12

Last modified: 18 June 2024