PHP code specification (10) _ PHP Tutorial

PHP code specification (10 ). 5.2 perform initialization when declaring local variables. The only reason for not doing so is that the initial value of the variable depends on some previous calculations. 5.3 The layout is only available in the opening of the code block 5.2 initialization

Try to initialize the local variable while declaring it. The only reason for not doing so is that the initial value of the variable depends on some previous calculations.

5.3 layout

Declare variables only at the beginning of the code block. (A block refers to any code contained in braces "{" and .) Do not declare the variable when it is used for the first time. This will confuse unfocused programmers and impede code portability in this scope.

Function myMethod (){
Int $ int1 = 0; // start of the method block

If ($ condition ){
Int $ int2 = 0; // start of the "if" block
...
}
}

An exception to this rule is the index variable of the for loop.

For (int $ I = 0; I <$ maxLoops; $ I ++ ){...}

Avoid declaring local variables to overwrite the variables declared at the upper level. For example, do not declare the same variable name in the internal code block:

Int $ count;
...
Function myMethod (){
If ($ condition ){
Int $ count = 0; // avoid this declaration
...
}
...
}

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