PHP closure practical case usage analysis
This time I will bring you an analysis of the actual use of PHP closures. What are the precautions for the actual use of PHP closures? . The following is a practical case, let's take a look.
<?php
function getClosure($i)
{
$i = $i.'-'.date('H:i:s');
return function ($param) use ($i) {
echo "--- param: $param ---\n";
echo "--- i: $i ---\n";
};
}
$c = getClosure(123);
$i = 456;
$c('test');
sleep(3);
$c2 = getClosure(123);
$c2('test');
$c('test');
/*
output:
--- param: test ---
--- i: 123-21:36:52 ---
--- param: test ---
--- i: 123-21:36:55 ---
--- param: test ---
--- i: 123-21:36:52 ---
*/One more example
$message = 'hello';
$example = function() use ($message){
var_dump($message);
};
echo $example();
//输出hello
$message = 'world';
//输出hello 因为继承变量的值的时候是函数定义的时候而不是 函数被调用的时候
echo $example();
//重置为hello
$message = 'hello';
//此处传引用
$example = function() use(&$message){
var_dump($message);
};
echo $example();
//输出hello
$message = 'world';
echo $example();
//此处输出world
//闭包函数也用于正常的传值
$message = 'hello';
$example = function ($data) use ($message){
return "{$data},{$message}";
};
echo $example('world');
//此处输出world,helloI 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!
Recommended reading:
Detailed explanation of steps to implement infinite comment nesting in php
The above is the detailed content of PHP closure practical case usage analysis. For more information, please follow other related articles on the PHP Chinese website!
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