Rule Definition
Using the proper declaration in switch statements helps to read , understand , modify , maintain and enhance the code easily.

Remediation
Sample: switch ($expr) { case 0: echo 'First case, with a break'; break; case 1: echo 'Second case, which falls through'; // no break case 2: case 3: // case is followed more than 1 space , which is against coding standard Case 4: // CASE keyword must be lowercase , which is against coding standard echo 'Third case, return instead of break'; return; case 5: //There must be a comment when fall-through is intentional. case 6: echo '6th case,'; Default: // DEFAULT keyword must be lowercase echo 'Default case'; break; } Remediation: switch ($expr) { case 0: echo 'First case, with a break'; break; case 1: echo 'Second case, which falls through'; // no break case 2: case 3: // case is followed single space , correct coding standard case 4: // CASE keyword is in lowercase , correct coding standard echo 'Third case, return instead of break'; return; case 5: echo 'Fifth case, which falls through'; // Fall through comments are added. case 6: echo '6th case,'; default: // DEFAULT keyword in lowercase, correct coding standard echo 'Default case'; break; }

Violation Code Sample

<?php
switch ($expr)
{ 
case 0:
    echo 'Statements must be defined with colon'     //Statement must be defined with a colon VIOLATION
    break;
case 1:
    echo 'Terminating statement must be indented to the same level as the CASE body';    
break;                                                     //Terminating statement must be indented to the same level as the CASE body VIOLATION
case 2:
    echo 'Terminating statement must be on a line by itself'; break;     //Terminating statement must be on a line by itselfbreak; VIOLATION   
case 3: echo 'Body must start on the line following the statement';   //Body must start on the line following the statement  VIOLATION
   break;
case 4:
    echo 'case without no break statement';           // no break VIOLATION
case 5:                                          //empty case body   VIOLATION
case   6: // case is followed single space , correct coding standard    VIOLATION
CASE 7: 
    echo 'keyword in lowercase';        // CASE keyword is in lowercase , correct coding standard   VIOLATION
    break;
case 8  :
    echo 'any space before colon';        //space before the colon in a statement  , //VIOLATION 
    break;
DEFAULT: 
    echo 'Default case';    // DEFAULT keyword in lowercase, correct coding standard echo  VIOLATION 
}
?<

Fixed Code Sample

<?php
switch ($expr)
{ 
    case 0:
        echo 'Statements must be defined with colon'; //Statement must be defined with a colon ,VIOLATION REMOVED
        break;
    case 1:
        echo 'Terminating statement must be indented to the same level as the CASE body';    
        break;                                                     //Terminating statement must be indented to the same level as the CASE body
    case 2:
        echo 'Terminating statement must be on a line by itself';  //Terminating statement must be on a line by itself
        break;    
    case 3:
        echo 'Body must start on the line following the statement';   //Body must start on the line following the statement
        break;
    case 4:
        echo 'case without no break statement';  
        break;                                      // no break    VIOLATION REMOVED
    case 5: 
        echo 'case without body not allowed';  
        break;                                           //empty case body  VIOLATION REMOVED
    case 6:
        echo 'case is followed single space , correct coding standard';        
        break;                                      // case is followed single space , correct coding standard VIOLATION REMOVED
    case 7: 
        echo 'case keyword in lowercase';        // CASE keyword is in lowercase , //VIOLATION REMOVED
        break;
    case 8:
        echo 'there must not be any space before colon';        //There must be no space before the colon in a statement  , //VIOLATION REMOVED
        break;
    default: 
        echo 'Default case';          // DEFAULT keyword in lowercase, correct coding standard VIOLATION REMOVED
}
?>

Source Reference: https://pear.php.net/reference/PHP_CodeSniffer-latest/PHP_CodeSniffer/PSR2_Sniffs_ControlStructures_SwitchDeclarationSniff.html