note 113007 added to language.types.callable

For people looking for simple callback inside of a function call php supports the observer pattern. <?php //this code will echo test 10 times function test($function){ $test = 'hallo'; for($a = 0; $a < 10; $a++){ $function($test, $a); } } test(function($test, $a){ echo "$test - $a <br>"; }); ?> I like this, its very handy for more advanced code. The only problem is that variables declared inside the callback function can not be reached so easily form the outside as in javascript. <?php $options = array( 0 => array('name', 'value'), 1 => array('name', 'value'), 2 => array('name', 'value'), 3 => array('name', 'value'), 4 => array('name', 'value') ); function loop_options($options, $name, $function){ $focus = false; if(isset($_REQUEST[$name])){ $focus = true; } foreach($options as $key => $option){ $function($key, $option[0], $option[1], $focus); } } $html = ''; loop_options($options, 'form', function($key, $name, $value, $focus){ $selected = ''; if($focus){ $selected = 'selected'; } //this will fail you need to set global global $html; $html .= "<option value='$value' $selected>$name</option>"; }); echo "<select name='form'>$html</select>"; ?> ---- Server IP: 69.147.83.199 Probable Submitter: 217.121.76.24 ---- Manual Page -- http://php.net/manual/en/language.types.callable.php Edit -- https://master.php.net/note/edit/113007 Del: integrated -- https://master.php.net/note/delete/113007/integrated Del: useless -- https://master.php.net/note/delete/113007/useless Del: bad code -- https://master.php.net/note/delete/113007/bad+code Del: spam -- https://master.php.net/note/delete/113007/spam Del: non-english -- https://master.php.net/note/delete/113007/non-english Del: in docs -- https://master.php.net/note/delete/113007/in+docs Del: other reasons-- https://master.php.net/note/delete/113007 Reject -- https://master.php.net/note/reject/113007 Search -- https://master.php.net/manage/user-notes.php