<?php
function the_func()
{
return FALSE;
}
if ($temp = the_func()) {
print __LINE__;
print $temp;
} else {
print __LINE__;
}
function pleac_Passing_by_Named_Parameter()
{
// PHP doesn't directly support named / keyword parameters, but these can be
// easily mimiced using a class of key / value pairs, and passing a variable
// number of arguments
class KeyedValue
{
public $key, $value;
public function __construct($key, $value)
{
$this->key = $key;
$this->value = $value;
}
}
function the_func()
{
foreach (func_get_args() as $arg) {
printf("Key: %10s|Value:%10s\n", $arg->key, $arg->value);
}
}
// ----
the_func(new KeyedValue('name', 'Bob'), new KeyedValue('age', 36), new KeyedValue('income', 51000));
// ----------------------------
// Alternatively, an associative array of key / value pairs may be constructed.
// With the aid of the 'extract' built-in function, the key part of this array
// may be intsntiated to a variable name, thus more closely approximating the
// behaviour of true named parameters
function the_func($var_array)
{
extract($var_array);
if (isset($name)) {
printf("Name: %s\n", $name);
}
if (isset($age)) {
printf("Age: %s\n", $age);
}
if (isset($income)) {
printf("Income: %s\n", $income);
}
}
// ----
the_func(array('name' => 'Bob', 'age' => 36, 'income' => 51000));
// ----------------------------
class RaceTime
{
public $time, $dim;
public function __construct($time, $dim)
{
$this->time = $time;
$this->dim = $dim;
}
}
function the_func($var_array)
{
extract($var_array);
if (isset($start_time)) {
printf("start: %d - %s\n", $start_time->time, $start_time->dim);
}
if (isset($finish_time)) {
printf("finish: %d - %s\n", $finish_time->time, $finish_time->dim);
}
if (isset($incr_time)) {
printf("incr: %d - %s\n", $incr_time->time, $incr_time->dim);
}
}
// ----
the_func(array('start_time' => new RaceTime(20, 's'), 'finish_time' => new RaceTime(5, 'm'), 'incr_time' => new RaceTime(3, 'm')));
the_func(array('start_time' => new RaceTime(5, 'm'), 'finish_time' => new RaceTime(30, 'm')));
the_func(array('start_time' => new RaceTime(30, 'm')));
}
