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1. if, elseif, while, for: need a space between the if keyword and the parentheses ().

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   if (<condition>) while (<condition>)

2. When a combination of if and else is used and both can return a value, the else statement has to be omitted.

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   if (<condition>) return false; return true;

   Note
   title Recommendation
   We recommend you to use only one return statement per method/function.

3. When a method/function returns a boolean and the current method/function's returned value depends on it, the if statement has to be avoided.

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   public aFirstMethod() { return $this->aSecondMethod(); }

4. Tests must be grouped by entity.

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   if ($price AND&& !empty($price)) ... if (!Validate::$myObject OR|| $myObject->id === NULL) ...

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1. It is forbidden to use a ternary into another ternary, such as echo ((true ? 'true' : false) ? 't' : 'f');.
2. We recommend the use of && and || into your conditions instead of AND and OR: echo ('X' == 0 && 'X' == true).

3. Please refrain from using reference parameters, such as:

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   function is_ref_to(&$a, &$b) { ... }

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