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How to use static variables in PHP functions

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php中世界最好的语言 Original
2018-03-24 11:49:03 3488browse

This time I will bring youPHP functionstaticHow to use variables, what are theprecautionsfor using PHP function static variables, the following are practical cases , let’s take a look.

In PHP, in addition to the static memberspropertiesof classes, static can also be used to define static variables in functions. This makes it easy to complete function iteration.

Example 1:

In the above example, every time the Test function is called, a is reassigned to 0, because once the function exits, the variable a is is reassigned to 0, because variable a no longer exists once this function exits. To complete the iteration, you need to write a counting function that will not lose the current count value. You need to define the variable $a as static:

In this way, $a is only assigned the value when it is called for the first time, and then Incremented by 1 on each call and will not be overridden.

In this way, you can use this feature to iterate a specified number of times for an operation:

Example 2:(Get the result after popping 5 elements out of an array)

$arr = range(1,10,1); function test($arr) { static $count=0; array_pop($arr); $count++; if ($count < 5) { test($arr); }else{ var_dump($arr);exit; } } test($arr);

Run results:

array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) }

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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