Sophie: php-manual-en-4.3.0-2mdk noarch

php-manual-en-4.3.0-2mdk.noarch.rpm

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>Pseudo-types used in this documentation</H1
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>mixed</H2
><P
>&#13;     <TT
CLASS="literal"
>mixed</TT
> indicates that a parameter may accept multiple (but not
     necesseraly all) types.
    </P
><P
>&#13;     <A
HREF="function.gettype.html"
><B
CLASS="function"
>gettype()</B
></A
> for example will accept all PHP types,
     while <A
HREF="function.str-replace.html"
><B
CLASS="function"
>str_replace()</B
></A
> will accept strings and arrays.
    </P
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>number</H2
><P
>&#13;     <TT
CLASS="literal"
>number</TT
> indicates that a parameter can be either
     <A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
> or <A
HREF="language.types.float.html"
><B
CLASS="type"
>float</B
></A
>.
    </P
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>callback</H2
><P
>&#13;     Some functions like <B
CLASS="function"
>call_user_function()</B
> 
     or <A
HREF="function.usort.html"
><B
CLASS="function"
>usort()</B
></A
> accept user defined 
     callback functions as a parameter. Callback functions can not only
     be simple functions but also object methods including static class
     methods. 
    </P
><P
>&#13;     A PHP function is simply passed by its name as a string. You can
     pass any builtin or user defined function with the exception of 
     <A
HREF="function.array.html"
><B
CLASS="function"
>array()</B
></A
>, 
     <A
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><B
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>echo()</B
></A
>, 
     <A
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><B
CLASS="function"
>empty()</B
></A
>, 
     <A
HREF="function.eval.html"
><B
CLASS="function"
>eval()</B
></A
>, 
     <A
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><B
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>exit()</B
></A
>, 
     <A
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><B
CLASS="function"
>isset()</B
></A
>, 
     <A
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><B
CLASS="function"
>list()</B
></A
>, 
     <A
HREF="function.print.html"
><B
CLASS="function"
>print()</B
></A
> and 
     <A
HREF="function.unset.html"
><B
CLASS="function"
>unset()</B
></A
>.
    </P
><P
>&#13;     A method of an instantiated object is passed as an array containing
     an object as the element with index 0 and a method name as the 
     element with index 1.
    </P
><P
>&#13;     Static class methods can also be passed without instantiating an
     object of that class by passing the class name instead of an 
     object as the element with index 0.
    </P
><P
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><P
><B
>Example 7-11. 
       Callback function examples
      </B
></P
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><PRE
CLASS="php"
>&#60;?php 

// simple callback example
function foobar() {
    echo "hello world!";
}
call_user_function("foobar"); 

// method callback examples
class foo {
  function bar() {
    echo "hello world!";
  }
}

$foo = new foo;

call_user_function(array($foo, "bar")); // object method call

call_user_function(array("foo", "bar")); // static class method call

?&#62;</PRE
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