Too many class implementations can increase costs
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Too many class definitions can cause agility issues
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While Loops are more productive than For Loops
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Constructors with a return value can be unproductive in PHP
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Having empty statements can be unproductive in PHP
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Too many functions with default value parameters are unproductive
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Having an assignment to “this” can be unproductive
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Using “instanceOf” causes Production Risk
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Switch cases without ending breaks are hard to understand
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Too many global variables can be unproductive
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