Why does re-using this function not work? [closed]

Function “works” once because before first call of is_service_class(), function is_personal not exists and whole this block is executed

if ( ! function_exists( 'is_personal' ) ) { 
    // declaration and use of function
}

In next call of is_service_class() is_personal is declared and the entire block is skipped. Inside the condition if ( !function_exists( 'is_personal' ) ) leave only the declaration: 

if ( !function_exists( 'is_personal' ) ) { 

    function is_personal() {
        return ( is_post_type_archive('pk-personal') || is_singular( 'pk-personal' ) || is_page( array( 6814, 'personal-family', 'Personal & Family Services' ) ) ) ? true : false ;
    }
}
if ( is_personal() ) {
    echo 'personal-service'; 
}

Similary is with is_business().

I would suggest this form:

if ( !function_exists( 'is_service_class' ) ) {

    function is_service_class () {

        if ( is_personal() ) {
            echo 'personal-service'; 
        } 
        if ( is_business() ) {
            echo 'business-service'; 
        } 
    }
}

if ( !function_exists( 'is_personal' ) ) { 

    function is_personal() {
        return ( is_post_type_archive('pk-personal') || is_singular( 'pk-personal' ) 
            || is_page( array( 6814, 'personal-family', 'Personal & Family Services' ) ) ) ? true : false ;
    }
}
if ( !function_exists( 'is_business' ) ) {

    function is_business() {
        return ( is_post_type_archive('pk-business')  || is_singular( 'pk-business' ) 
            || is_page( array( 6821, 'business-services', 'Business Services' ) ) ) ? true : false ;
    }
}

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