1 – Initializes variables before use.2 – Spend time studying PHP , it is a language in continuous process of growth and its characteristics are changing over time.3 – Increase one variable in a method is as fast as , just do it in a function.4 – Increasing global variable is twice as slow a local variable.5 – Increase a local variable in a method is faster. Almost the same as calling a local variable in a function.6 – Increase a undefined variable is 9 or 10 times slower than an already pre-declared.7 – The fact declare a global variable despite not use any function in your script lags, PHP has to check if the variable exists.8 – Calling a function with a parameter takes about the same time than 7-8 operations with local variables, and the same method call would result in about 15 operations.9 – If you need to know the timestamp of access to a script, consider using $ _SERVER ['REQUEST_TIME'] instead of time ().10 – $ row ['id'] is 7 times faster than $ row [id].11 – $ localvar is up to 15 times faster than function inc () ($ localvar;).12 – The PHP scripts are “compiled” each time they are executed unless you save the code object in a cache. Different PHP compilation tools improve performance up to 100%.

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