PHP global variable _php tutorial

< span="">

< span="">

< span="">

 
    < span=""> < span="">    =< span="">  "  why"< span="">  = "What"  < span=""> 
ChangeName (); < span="">< span=""> . "
"< span="">?>

The result of executing the code is: My name was why, not the ChangeName () after performing the What. Analyze the reason, because the function body changename within the $name variable is set to local variables by default, $name scope is within the changename. So, modify the code and add the global variables as follows:

 
    < span="">< span="">< span="">< span=""> < span="">    =< span="">  "  why"< span="">  = "What"  < span=""> 
ChangeName (); < span="">< span=""> . "
"< span="">?>

Attention:< span="">

The result of defining a global variable is still my name is why, which surprises me. It turns< span="">out, "that is, when a function refers to an external variable, it can be declared within a function through global, so that the variable can be used in the function (equivalent to passing in as a parameter). Then, modify the code again:

 
    < span="">=  < span="">  < span="">  "Why" < span="">  < span="">  < span="">  < span="">   < span="">  = "What  "< span="">  .  < span="">   < span=""> "
"< span="">?>

The results of this operation are: My name is what, description< span="">

 
    < span="">=  < span="">  < span="">  "Why" < span="">  < span="">  < span="">  < span="">  < span=""> = "What < span=""> "  < span="">   < span="">    < span="">  = "  where".< span="">    < span="">  < span=""> "
"< span="">?>

　< span="">

< span="">< span="">

< span="">

 
    < span="">=< span="">"< span="">< span="">Why" [' name '] = "What"  < span=""> < span="">< span="">< span=""> . "
"< span="">?>

　　< span="">

< span="">

!--?   = 1
      
        = 2
        
          [' var2 '] = &[' var1 '  < Span echo< span> . "

            "   = 1   = 2  < Span Test2 () {span> ,  = &  . "

                      "  ?>              
        
      

The value of the

$GLOBALS is always available in PHP. Another example:

 
    < span="">=< span="">1< span="">([' var1 '< span="">< span="">< span=""> < span="">< span="">< span=""> . "
"  < span="">  < span=""> = 1  < span="">    < span="">  < span="">  < span="">< span="">< span="">< span="">(< span="">< < span="">/c40>< span="">?>< span="">< span="">

　　

http://www.bkjia.com/PHPjc/749824.html www.bkjia.com true http://www.bkjia.com/PHPjc/749824.html techarticle ? = "why" = "What" changename (); "My name is" ... " br/"? The result of executing the code is: My name was why, not the ChangeName () after performing the What. Analyze the reason, this is because the function body ...

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