"PHP Global variables and static variables, how to use static methods"

The PHP global variable uses the keyword global declaration, static variables use static declarations, and the use of static variables can use the class name:: Variable name

Example code:

1<?PHP2 3 //usage of global variables and use of static variables4     Global $sum;5     $sum=0;6     class Person7     {8          Public $name;9          Public $age;Ten          Public Static $zong=0; One          Public function__construct ($name,$age) A         { -             $this->name=$name; -             $this->age=$age; the         } -          Public functionAddNew () -         { -             Echo $this->name. " Join the team! <br/> "; +             Global $sum; -             $sum++; +Self::$zong++; A         } at          Public function__destruct () -         { -             Echo"<br/>".$this->name. " Leave the team! <br/> "; -         } -     } -     $p 1=NewPerson ("Zhang San", 12); in     $p 1-AddNew (); -     $p 2=NewPerson ("John Doe", 13); to     $p 2-AddNew (); +     Echo"Shared".$sum." People join the team <br/> "; -     Echo"<br/><br/><br/><br/>"; the     Echo"The record value for the static variable is". Person::$zong; *  $     //usage of static variable globalPanax Notoginseng  -?>

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Examples of use of static methods:

1<?PHP2         classStudent3         {4              Public Static $sum=0;5              Public $fee;6              Public $name;7              Public function__construct ($name,$fee)8             {9                 Echo $name." Join the school, spend ".$fee." Yuan <br/> ";Ten                 $this-$fee=$fee; One                 $this-$name=$name; ASelf::$sum+=$fee; -             } -              Public Static functionGetfee () the             { -                 returnSelf::$sum; -             } -         } +         $st 1=NewStudent ("Zhang San", 12); -         $st 2=NewStudent ("John Doe", 13); +         Echo"School total income (class name static method call)". Student::getfee (). " Yuan <br/> "; A         Echo"School total income (instance static method invocation)".$st 1->getfee (). " Yuan <br/> "; at?>

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"PHP Global variables and static variables, how to use static methods"