Accept function as parameter in PHP

Question

I ve been wondering whether is possible or not to pass a function as parameter in PHP  I want something like when you re programming in JS   object exampleMethod function           some stuff to execute       What I want is to execute that function somewhere in exampleMethod  Is that possible in PHP

User · Answer

PHP VERSION    5 3 0  Example 1  basic  function test  test param   my function        return  my function  test param      test  param   function  param        echo  param        will echo  param    Example 2  std object   obj   new stdClass     obj- gt test   function   test param   my function        return  my function  test param        test    obj- gt test   test  param   function  param        echo  param        Example 3  non static class call  class obj      public function test  test param   my function            return  my function  test param             obj   new obj     obj- gt test  param   function  param        echo  param        Example 4  static class call  class obj       public static function test  test param   my function            return  my function  test param            obj  test  param   function  param        echo  param

User · Answer

Just to add to the others  you can pass a function name   function someFunc  a        echo  a     function callFunc  name         name  funky        callFunc  someFunc      This will work in PHP4

User · Answer

According to  zombat s answer  it s better to validate the Anonymous Functions first   function exampleMethod  anonFunc          execute anonymous function     if  is callable  anonFunc              anonFunc              Or validate argument type since PHP 5 4 0   function exampleMethod callable  anonFunc

User · Answer

Tested for PHP 5 3  As i see here  Anonymous Function could help you  http   php net manual en functions anonymous php  What you ll probably need and it s not said before it s how to pass a function without wrapping it inside a on-the-fly-created function  As you ll see later  you ll need to pass the function s name written in a string as a parameter  check its  callability  and then call it   The function to do check    if  is callable   string function name            perform the call       Then  to call it  use this piece of code  if you need parameters also  put them on an array   seen at   http   php net manual en function call-user-func php  call user func array   string holding the name of your function    arrayOfParameters      as it follows  in a similar  parameterless  way        function funToBeCalled            print  ----------------------i m here              function wrapCaller  fun           if  is callable  fun                print  called                call user func  fun            else              print  fun   not called                         wrapCaller  funToBeCalled        wrapCaller  cannot call me      Here s a class explaining how to do something similar     lt  php class HolderValuesOrFunctionsAsString      private  functions   array        private  vars   array         function   set  name  data           if is callable  data                this- gt functions  name     data          else              this- gt vars  name     data             function   get  name            t    this- gt vars  name           if isset  t               return  t          else               t    this- gt  functions  name               if  isset  t                   return  t                       function   call  method  args null            fun    this- gt functions  method           if isset  fun                call user func array  fun  args             else                  error out             print  ERROR  Funciton not found      method                       gt    and an example of usage   lt  php       create a sample function       function sayHello  some    all          gt            lt br gt hello to  lt    some  gt  lt br gt       lt  php             obj   new HolderValuesOrFunctionsAsString         do the assignement        obj- gt justPrintSomething    sayHello     note that the given          sayHello  it s a string             now call it        obj- gt justPrintSomething      will print   hello to all  and         a break-line  for html purpose          if the string assigned is not denoting a defined method            it s treat as a simple value        obj- gt justPrintSomething    thisFunctionJustNotExistsLOL        echo  obj- gt justPrintSomething    what do you expect to print          just that string         N B    justPrintSomething  is treated as a variable now          as the   set  s override specify           after the assignement  the what is the function s destiny assigned before   It still works  because it s held on a different array         obj- gt justPrintSomething  Jack Sparrow             You can use that  variable   ie  justPrintSomething   in both ways    so you can call  justPrintSomething  passing itself as a parameter          obj- gt justPrintSomething   obj- gt justPrintSomething               prints   hello to thisFunctionJustNotExistsLOL  and a break-line          in fact   justPrintSomething  it s a name used to identify both          a value  into the dictionary of values  or a function-name           into the dictionary of functions      gt

User · Answer

Just code it like this   function example  anon       anon       example function         some codes here       it would be great if you could invent something like this  inspired by Laravel Illuminate    Object  method  param 1   function  param      param- gt something

User · Answer

Simple example using a class    class test        public function works  other parameter   function as parameter                 return  function as parameter  other parameter                obj   new test      echo  obj- gt works  working well  function  other parameter         return  other parameter

User · Answer

It s possible if you are using PHP 5 3 0 or higher   See Anonymous Functions in the manual   In your case  you would define exampleMethod like this   function exampleMethod  anonFunc          execute anonymous function      anonFunc

User · Answer

You can also use create function to create a function as a variable and pass it around  Though  I like the feeling of anonymous functions better  Go zombat

[php] Accept function as parameter in PHP

Example 1: basic

Example 2: std object

Example 3: non static class call

Example 4: static class call

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