PHP global variable _ PHP Tutorial

PHP global variables .? WhywhatchangeName (); mynameis.br? The result of code execution is: mynameiswhy, instead of what is displayed after changeName () is executed. This is because the function body

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The result of code execution is: my name is why, instead of what is displayed after changeName () is executed. This is because the $ name variable in the changeName function is set as a local variable by default, and the $ name scope is within changeName. Therefore, modify the code and add the global variables as follows:

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Note:

After the global variables are defined, the execution result is still my name is why, which surprised me. Originally, "that is to say, when a function references an external variable, the variable can be declared through global in the function, in this way, the variable can be used in the function (equivalent to being passed in as a parameter ). Then, modify the code again:

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The result of this operation is: my name is what, meaning

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 " = 1 = 2 , = &  . "
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;You can access them. Unlike all other super-global variables,$ GLOBALSAlways available in PHP. Another example:

 " = 1 ( ?>

　　

Http://www.bkjia.com/PHPjc/749824.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/749824.htmlTechArticle? = "Why" = "what" changeName (); "my name is"... "br /"? The result of code execution is: my name is why, instead of what is displayed after changeName () is executed. Analyze the cause. this is because of the function body...