Example of a singleton class in PHP _php tutorial

Example of a singleton class in PHP

This article mainly introduces the example of a single instance of PHP, this article directly gives code examples, the need for friends can refer to the following

The single-instance class in PHP is useful for exchanging data and saving memory. Write a simple example.

Class 1, the single-instance class itself:

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Class UTIL { private static $instance; Public function get () { if (!self:: $instance) { Self:: $instance = new UTIL (); } Return self:: $instance; } Public $number = 10; Public function Change ($num) { $this->number + = $num; } Public Function Getnum () { return $this->number; } }

Class 2, use the application class for the single-instance class described above:

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Class Singlea { Private $numInst; function __construct () { $this->numinst = Util::get (); } Public function Change ($num) { $this->numinst->change ($num); } Public Function Getnum () { return $this->numinst->getnum (); } }

Class 3, homogeneous 2:

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Class Singleb { Private $numInst; function __construct () { $this->numinst = Util::get (); } Public function Change ($num) { $this->numinst->change ($num); } Public Function Getnum () { return $this->numinst->getnum (); } }

The last place to call is:

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$instA = new Singlea (); $instA->change (100); Var_dump (' Singlea CHANGED: '); Var_dump ($instA->getnum ()); $instB = new Singleb (); $instB->change (-510); Var_dump (' Singleb CHANGED: '); Var_dump ($instB->getnum ());

The result of the final display:

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String ' Singlea CHANGED: ' (length=17) int110 String ' Singleb CHANGED: ' (length=17) int-400

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