如何在PHP 5.2中实现PHP 5.2中的函数模板？

This code runs very well in PHP 5.3 but not in PHP 5.2. How can you implement something like this in PHP 5.2?

echo "Calling func....<br/>";
function template_func( $data=array(), $func ) {
    echo "<ul>";
    foreach ($data as $k => $v) {
        $func( $v );    
    }
    echo "</ul>";
}

$data = array( 1, 2, 3, 4, 5 );

template_func( $data, function ( $v ) { 
    echo "<li>$v</li>"; 
} );

template_func( $data, function ( $v ) { 
    echo "<li><span class='style'>$v</span></li>"; 
} );

You can use call_user_func() / call_user_func_array(). You will have to pass the function name as a string. You can also call methods and static methods this way, please check the manual.

You could also use is_callable() to verify whether the parameter can be called as a function.

A simple example with call_user_func():

function template_func( $data=array(), $func ) {
    echo "<ul>";
    foreach ($data as $k => $v) {
        call_user_func($func, $v);    
    }
    echo "</ul>";
}

function spannedList ( $v ) { 
    echo "<li><span class='style'>$v</span></li>"; 
}
template_func($data, 'spannedList');

An alternative method would be to use create_function(). This way, you don't even have to change the definition of your template_func().

Simply change the anonymous functions to create_function:

template_func( $data, create_function( '$v', '
    echo "<li>$v</li>"; 
' ) );

template_func( $data, create_function( '$v', '
    echo "<li><span class=\'style\'>$v</span></li>"; 
' ) );