php中的匿名函数与闭包

$closureFunc = function(){ 　　　　.... };

$closureFunc = function($str){ 　　 echo $str; }; $closureFunc("hello world!");

function closureFunc1(){ $func = function(){ echo "hello"; }; $func(); } closureFunc1();//输出: hello

function closureFunc2(){ $num = 1; $func = function(){ echo $num; }; $func(); } closureFunc2();//Notice: Undefined variable: num

function closureFunc2(){ $num = 1; $func = function() use($num){ echo $num; }; $func(); } closureFunc2();//输出: 1

function closureFunc3(){ $num = 1; $func = function() use($num){ echo $num; }; return $func; }$func = closureFunc3(); //函数返回匿名函数$func(); //然后我们在用$func() 调用//输出: 1

function closureFunc4(){ $num = 1; $func = function($str) use($num){ echo $num; echo "\n"; echo $str; }; return $func; }$func = closureFunc4();$func("hello, closure4");//输出: //1 //hello, closure4

function closureFunc5(){ $num = 1; $func = function() use($num) { echo "\n"; $num++; echo $num; }; echo "\n"; echo $num; return $func; }$func = closureFunc5();$func();$func();$func();//输出: // 1 // 2 // 2 // 2

function closureFunc5(){ $num = 2; $func = function() use(&$num) { echo "\n"; $num++; echo $num; }; echo "\n"; echo $num; return $func; }$func = closureFunc5();$func();$func();$func();//输出: // 2 // 3 // 4 // 5

function callFunc($func){ $func("argv"); } callFunc(function($str){ echo $str; })//输出： // argv