我需要能够调用一个函数,但函数名存储在一个变量,这是可能的吗?例句:
function foo ()
{
//code here
}
function bar ()
{
//code here
}
$functionName = "foo";
// I need to call the function based on what is $functionName
我需要能够调用一个函数,但函数名存储在一个变量,这是可能的吗?例句:
function foo ()
{
//code here
}
function bar ()
{
//code here
}
$functionName = "foo";
// I need to call the function based on what is $functionName
当前回答
我从这个问题和答案中学到了什么。感谢所有!
假设我有这些变量和函数:
$functionName1 = "sayHello";
$functionName2 = "sayHelloTo";
$functionName3 = "saySomethingTo";
$friend = "John";
$datas = array(
"something"=>"how are you?",
"to"=>"Sarah"
);
function sayHello()
{
echo "Hello!";
}
function sayHelloTo($to)
{
echo "Dear $to, hello!";
}
function saySomethingTo($something, $to)
{
echo "Dear $to, $something";
}
To call function without arguments // Calling sayHello() call_user_func($functionName1); Hello! To call function with 1 argument // Calling sayHelloTo("John") call_user_func($functionName2, $friend); Dear John, hello! To call function with 1 or more arguments This will be useful if you are dynamically calling your functions and each function have different number of arguments. This is my case that I have been looking for (and solved). call_user_func_array is the key // You can add your arguments // 1. statically by hard-code, $arguments[0] = "how are you?"; // my $something $arguments[1] = "Sarah"; // my $to // 2. OR dynamically using foreach $arguments = NULL; foreach($datas as $data) { $arguments[] = $data; } // Calling saySomethingTo("how are you?", "Sarah") call_user_func_array($functionName3, $arguments); Dear Sarah, how are you?
耶再见!
其他回答
$functionName()或call_user_func($functionName)
使用存储在变量中的名称安全地调用函数的最简单方法是,
//I want to call method deploy that is stored in functionname
$functionname = 'deploy';
$retVal = {$functionname}('parameters');
我使用如下方法在Laravel中动态创建迁移表,
foreach(App\Test::$columns as $name => $column){
$table->{$column[0]}($name);
}
我最喜欢的版本是内联版本:
${"variableName"} = 12;
$className->{"propertyName"};
$className->{"methodName"}();
StaticClass::${"propertyName"};
StaticClass::{"methodName"}();
你也可以把变量或表达式放在括号里!
如果你在一个对象上下文中试图动态调用一个函数,请尝试如下代码:
$this->{$variable}();
使用call_user_func函数。